JP4161433B2 - Flyback transformer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flyback transformer that is used in equipment using a cathode ray tube (hereinafter referred to as CRT), such as a television receiver, a computer display device, and a projection device, and that supplies a high voltage to the cathode ray tube. It is.
[0002]
[Prior art]
In recent years, efforts to destroy the environment have been made as a global movement.
[0003]
Deforestation due to acid rain, global warming due to carbon monoxide, effects on human bodies due to environmental hormones, etc. Among them, color TVs, which are electrical products, have been moving toward improvements in recycling rates and energy savings. In particular, there is a high demand for an improvement in the recycling rate.
[0004]
In addition, in order to improve the recycling rate in color televisions, there is a high demand for efforts to improve the recycling rate and decomposability of FBT, which is a major component in color televisions.
[0005]
Conventionally, this type of flyback transformer (hereinafter referred to as FBT) has a structure as shown in FIGS. That is, a hollow cylindrical portion is divided by a plurality of flanges 1a, a holding base 1c for holding a terminal pin 1b is disposed, a low-voltage coil bobbin 1 around which a low-voltage coil 1d is wound, and terminals at both ends of the hollow cylindrical portion A terminal block 2c for holding the pin 2b is provided, and the high voltage coil is divided into a plurality of coil layers on the outer periphery of the cylindrical portion and connected between the layers of the secondary winding and the high voltage coil bobbin 2 wound coaxially. A plurality of diodes 3, 1 to 2 resistors 4, a metal fitting 6 a with a hocus volume 5, a parts holder 7 to which a metal fitting 6 b with a high voltage section is attached, and the hocus volume 5 are combined to form an insulating cylinder 8a was placed in the outer case 8 and injected and impregnated with an epoxy resin as an insulating material. After that, the resin was cured, and the ferrite core 9 was inserted into the low-voltage coil bobbin 1 and attached.
[0006]
FIG. 5 shows a structure in which an anode connecting fitting 10 that is a connecting portion between a CRT and an FBT, an anode cap 11 that is an insulating cover, and a high-pressure processed product 13 that is assembled with a high-voltage cable 12 are assembled to the FBT at the same time. . The FBT shown in FIGS. 6 and 7 is configured such that a high-pressure processed product 14 is connected later. The high-pressure processed product 14 is a semi-strip state in which the anode cap 11 and the anode connection fitting 10 are attached to one end of a high-voltage cable 12 whose core wire is a single wire, the insulating coating portion at the tip is cut, and the coating is not removed. An insulating rubber cap 15 is inserted in the middle of the high-voltage cable 12 to form a high-pressure processed product 14.
[0007]
The semi-strip portion 12a at the tip is removed from the high-pressure processed product 14 so that the core wire can be seen, and when inserted into the outer case 8, the core wire 12c of the high-voltage cable is attached to the parts holder 7 and is connected to the end of the insulating cylinder. 6b, the high-pressure processed product 14 and the outer case 8 are fixed, and the coil body and the diode 3 are connected to the high-pressure processed product via the connection fitting 6b, and the high-pressure portion of the FBT main body and the CRT The anode button part is connected via the high-pressure processed product.
[0008]
[Problems to be solved by the invention]
In the FBT having the above-described conventional configuration, a low voltage coil, a high voltage coil, an electronic component, etc. of a low voltage part are housed in an outer case, and after being impregnated with an epoxy resin which is a thermosetting insulating material. Therefore, after thermosetting, it is extremely difficult to disassemble into a low voltage coil, a high voltage coil, and respective electronic components.
[0009]
The parts that can be disassembled are the ferrite core 9, a part of the high-voltage cable 12 that is a high-pressure processed product, the anode cap 11, and the like.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the FBT of the present invention separates a low voltage coil portion which is a low voltage portion from a high voltage coil portion which is a high voltage portion and a parts holder portion which holds a diode, etc. Insulation material is injected into epoxy resin, impregnated, and then cured by heat, and low voltage coil part of low voltage part is injected and impregnated with epoxy resin of insulation material, and can be insulated only by atmospheric air It is a configuration.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
1)
A low voltage coil wound around the outer periphery of the low voltage coil bobbin, a high voltage coil coaxially wound into a plurality of coil layers on the outer periphery of the high voltage coil bobbin located on the outer periphery side of the low voltage coil, a diode, a resistor, etc. In the flyback transformer constituted by a pair of U-shaped cores inserted into the electronic parts, the hocus volume, the outer case containing the flyback transformer main body and the insulating resin, and the low voltage coil, the high voltage coil, the diode, etc. The electronic parts, hocus volume, are housed in the outer case, insulated with an insulating material such as epoxy resin, and the low voltage coil is insulated in the air. The low-voltage side coil section is divided into the plastic used for the coil bobbin and the copper and terminal pins used for the coil. Decomposed into iron products that use, it is possible to recycle.
[0012]
2)
The outer case is formed with a cylindrical portion so as to be inscribed in the hollow cylindrical portion of the high voltage coil bobbin, the high voltage coil and the electronic component are accommodated on the outer periphery of the hollow cylindrical portion of the outer case, and the low voltage coil bobbin is Since it is inserted inside the cylindrical portion of the outer case, an epoxy resin as an insulating material can be injected only into the high voltage portion, and the high voltage coil and the low voltage coil portion can be insulated.
[0013]
3)
Extending both ends of the hollow cylindrical portion of the high-voltage coil bobbin in a part of a cylindrical shape, forming a hollow cylindrical portion in a central portion opposite to the terminal pin side provided side by side with the low-pressure coil of the outer case, Since the inscribed portion of the cylindrical portion of the high-voltage coil is fitted to the circumscribed portion of the cylindrical portion of the outer case, an epoxy resin as an insulating material can be injected only into the high voltage portion.
[0014]
4)
The outer case is formed with a cylindrical portion so as to be inscribed in the hollow cylindrical portion of the high-voltage coil bobbin, and a concave groove is provided inside the cylindrical portion, and a convex portion is arranged on a part of the flange of the low-voltage coil bobbin. The low voltage coil and the FBT main body part of the high voltage part can be fixed because they are installed and inserted into the groove of the concave part inside the cylindrical part of the outer case.
[0015]
5)
Both ends of the hollow cylindrical portion of the high-pressure coil bobbin are partially extended in a cylindrical shape, a recess groove is provided inside the cylindrical portion, and a convex portion is provided on a part of the flange of the low-pressure coil bobbin. Since the coil is inserted into the groove of the concave portion of the coil, the low voltage coil and the FBT main body portion of the high voltage portion can be solid.
[0016]
6)
Since the insulating material uses an epoxy resin excluding bromine-based retardants and increased amounts of alumina hydroxide and silica, when the FBT main body and the low-voltage coil are separated, the FBT main body side is It can be crushed and discarded by combustion.
[0017]
7)
Because the PBT (polybutylene terephthalate) using inorganic phosphorus as part of the flame retardant is used as the material for the exterior case, the case volume case and the low pressure coil bobbin, the FBT main body and the low pressure coil portion When the FBT is separated, the FBT main body side is crushed so that it can be discarded by combustion.
[0018]
With the above configuration, the FBT of the present invention has an effect of improving the decomposability and recyclability of the FBT.
[0019]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory view showing a configuration of an FBT according to an embodiment of the present invention, FIG. 2 is a sectional view of the FBT outer case, a high-voltage coil portion, and a low-voltage coil portion, and FIG. Sectional drawing of a coil part and a low voltage | pressure coil part.
[0020]
1 and 2, the FBT according to an embodiment of the present invention includes a holding base 1c in which a hollow cylindrical portion is divided by a plurality of flanges 1a and holds terminal pins 1b, and a low voltage coil 1d is provided. A wound low voltage coil bobbin 1 and a terminal block 2c for holding a terminal pin 2b are arranged at both ends of a hollow cylindrical portion, and the high voltage coil is divided into a plurality of coil layers on the outer periphery of the cylindrical portion and wound coaxially. High voltage coil bobbin 2, a plurality of diodes 3 connected between the layers of the hocus volume and the secondary winding, and one or two resistors, a metal fitting 6a to the hocus volume, and a metal fitting 6b to the high voltage section And the like, an outer case 8 provided with an insulating cylinder 8a, an epoxy resin 20 as an insulating material, and a ferrite core 9. High-pressure processed products connected to the cathode ray tube are retrofitted.
[0021]
In FIG. 1, for convenience of explanation, the central portion of the outer case is shown in cross section. In addition, the drawing of the hocus volume is a deleted drawing.
[0022]
A cylindrical part 8 d is formed in the outer case 8 so as to be inscribed in the hollow cylindrical part 2 d of the high-voltage coil bobbin 2. A high voltage coil bobbin 2 around which a high voltage coil is wound, a hocus volume, a connection holder 6a for connecting the diode 3, a resistor and a hocus volume, a parts holder 7 to which a connection metal fitting 6b for a high voltage section and the like are attached are assembled. The FBT body housed in the outer periphery of the hollow cylindrical portion 8d is preheated, and the preheated epoxy resin 20 of the insulating material is evacuated to the outer case and then injected, and then the resin is heated at several steps of temperature STEP Harden.
[0023]
A low-pressure bobbin 1 in which a low-voltage coil is wound around a resin-cured FBT main body 21 is inserted into a hollow portion at the center of the FBT main body 21, and nine ferrite cores are assembled and fixed with an adhesive 22 or the like. The low pressure bobbin 1 and the ferrite core 9 can be assembled at the same time as the FBT main body 21 is assembled.
[0024]
Further, a second embodiment of the present invention will be described with reference to FIG.
One end of a hollow cylindrical portion 2d of the high-voltage coil bobbin 2 is extended 2f and 2e, and a cylindrical portion 8c having a height of several millimeters is formed in the central portion on the bottom surface side of the exterior case 8. The inscribed portion of the extended cylindrical portion 2e of the high-pressure bobbin and the outer connected portion of the cylindrical portion 8c of the outer case are fitted by press fitting.
[0025]
If the inner diameter D-2e of the cylindrical portion 2e of the high-pressure bobbin and the outer diameter D-8c of the cylindrical portion 8c of the outer case are set, the inner diameter D-2e> the outer diameter D-8c is set, and the epoxy resin leaks as the insulating material. There is no structure.
[0026]
3 and 4, concave grooves 8g and 2g are provided inside the cylindrical portion of the outer case 8 and the high-pressure bobbin 2, and partial convex portions 8h and 2h are provided in the concave groove, so that a part of the flange of the low-voltage coil is provided. A convex portion 1j is provided, and the convex portion 1j of the low voltage coil is inserted between the outer case and the convex portions 8h and 2h of the high voltage bobbin, and the low voltage coil and the FBT main body are fixed.
[0027]
The conventional epoxy resin of FBT is made of epibis epoxy resin, brominated epoxy as a difficult agent, reactive diluent, antimony trioxide as a difficult auxiliary agent, hydrated alumina as a filler. In addition, the silica and the curing agent are composed of an acid anhydride and a curing accelerator. The main component and the curing agent are mixed in a certain amount, and resin is injected into the FBT and cured.
[0028]
The main component of the epoxy resin of FBT used in the present invention is an epibis epoxy resin, the difference between the filler hydrated alumina as a difficult agent, the silica of the filler, the curing agent is an acid anhydride and curing Consists of accelerators, which removes bromine-based insensitive substances, antimony trioxide.
[0029]
Furthermore, the conventional PBT, which is the raw material for the outer case of FBT, uses PBT and brominated flame retardant as a difficult agent, antimony trioxide as a difficult aid, glass fiber as a reinforcing agent, and other additives. Met. PBT, which is a raw material for the outer case of the present invention, is composed of PBT and inorganic phosphorus as a difficult agent, glass fiber as a reinforcing agent, and other additives. Removes antimony trioxide.
[0030]
【The invention's effect】
As is clear from the above description, the first FBT of the present invention can easily separate the FBT main body, the low-voltage coil of the low-voltage part and the high-pressure processed product, and therefore the low-voltage coil part is used for the coil bobbin. It can be disassembled into copper products used for plastics and coils and iron products used for terminal pins, and high-pressure processed products can be separated from high-voltage cables, anode caps, and anode fittings for recycling and disposal. It becomes.
[0031]
In addition, the second FBT of the present invention has a structure in which an epoxy resin of an insulating resin can be injected only into the high-pressure part by providing a hollow cylinder at the center of the outer case, and the low-voltage coil part can be recycled. Become.
[0032]
In addition, the third FBT of the present invention extends the end of the hollow tube and the hollow portion of the high voltage coil bobbin to the center of the outer case, and fits the hollow portion of the outer case with the insulating resin epoxy resin. The structure can be injected only into the high-pressure part, and the low-voltage coil part can be recycled.
[0033]
Further, the fourth and fifth FBTs of the present invention have a structure capable of fixing the low voltage coil part and the FBT main body part.
[0034]
In addition, since the FBT body of the sixth and seventh aspects of the present invention has eliminated the bromine-based refractory material and antimony trioxide, which are the targets of environmentally hazardous chemical substances, the impact on the environment is reduced, so that after grinding, It can be burned and discarded.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing the configuration of a flyback transformer in one embodiment of the present invention. FIG. 2 is an explanatory diagram showing the configuration of a flyback transformer in another embodiment of the present invention. FIG. 4 is an explanatory diagram showing the configuration of the main part of the flyback transformer. FIG. 5 is an explanatory diagram showing the configuration of the conventional flyback transformer. FIG. Explanatory drawing showing the configuration of a flyback transformer [FIG. 7] Explanatory drawing showing the configuration of a conventional flyback transformer [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Low voltage coil bobbin 1a 鍔 1b Terminal pin 1c Holding base 1d Low voltage coil 1g ridge convex part 2 High voltage coil bobbin 2b terminal hip pin 2c Terminal block 2d Hollow cylindrical part 2e Cylindrical extension part 2g Concave groove 2h Convex part 2j 凹Convex part 3 Diode 4 Resistance 5 Hocus volume 6a Connection fitting (Hocus volume)
6b Connecting bracket (high pressure)
7 Parts holder 8 Exterior case 8a Insulating cylinder part 8c Cylindrical part 8g Concave groove 8h Convex part 9 in the concave groove Ferrite core 10 Anode connection fitting 11 Anode cap 12 High voltage cable 12a Semi-strip part 13 High pressure processed product 14 High pressure processed product 15 Insulation Rubber cap 20 epoxy resin 21 FBT body

Claims (7)

A low voltage coil wound around the outer periphery of the low voltage coil bobbin, a high voltage coil wound coaxially by dividing into a plurality of coil layers on the outer periphery of the high voltage coil bobbin located on the outer periphery side of the low voltage coil, a hocus volume, In a flyback transformer comprising a flyback transformer main body and an outer case for storing insulating resin and a pair of U-shaped cores inserted into the low voltage coil, at least the high voltage coil is stored in the outer case, epoxy resin, etc. A flyback transformer characterized in that the low voltage coil is insulated in the air. A cylindrical portion is formed in the outer case so as to be inscribed in the hollow cylindrical portion of the high-voltage coil bobbin, the high-voltage coil and the electronic component are accommodated on the outer periphery of the hollow cylindrical portion of the outer case, and the low-voltage coil bobbin is accommodated in the outer case 2. The flyback transformer according to claim 1, wherein the flyback transformer is inserted inside the cylindrical portion. Both ends of the hollow cylindrical portion of the high-voltage coil bobbin are partially extended in a cylindrical shape, and a hollow cylindrical portion is partially formed in the central portion on the opposite side of the terminal pin side of the exterior case, which is provided on the low-voltage coil. 2. The flyback transformer according to claim 1, wherein an inscribed portion of a cylindrical portion of the coil is fitted to a circumscribed portion of the cylindrical portion of the outer case. A cylindrical part is formed in the exterior case so as to be inscribed in the hollow cylindrical part of the high-voltage coil bobbin, and a concave groove is provided inside the cylindrical part, and a convex part is provided on a part of the flange of the low-voltage coil bobbin. The flyback transformer according to claim 1, wherein the flyback transformer is inserted into a groove in a recess inside the cylindrical portion of the outer case. Both ends of the hollow cylindrical portion of the high-pressure coil bobbin are partially extended in a cylindrical shape, a recess groove is provided inside the cylindrical portion, and a convex portion is provided in a part of the flange of the low-voltage coil bobbin. 4. The flyback transformer according to claim 1, wherein the flyback transformer is inserted into a groove of the recess. The flyback transformer according to any one of claims 1, 2, 3, 4, and 5, wherein the insulating material is an epoxy resin excluding a brominated flame retardant and increasing the amount of alumina hydroxide and silica. The materials for the exterior case, the case of the hocus volume, and the low-pressure coil bobbin are made of PBT (polybutylene terephthalate) using inorganic phosphorus as a part of the flame retardant. The flyback transformer according to 3, 4, or 5.

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