JPH058924U - Obstacle prevention transformer - Google Patents

Abstract

(57) [Abstract] [Purpose] To fix the peripheral edge of the shielding plate arranged between the primary winding and the secondary winding to the outer box from the outside of the outer box. [Structure] The transformer main body A is installed at different locations on the iron core 10.
The secondary winding 21 and the secondary winding 22 are wound, and the primary winding 21
The shield plate 30 is disposed between the secondary winding 22 and the secondary winding 22. Further, the outer box B covering the transformer body A is divided into two divided bodies 40a and 40b at the position of the shield plate 30. The shield plate 3 is provided between the divided edges 41a and 41b of the two divided bodies 40a and 40b.
By arranging the peripheral edge of 0 and integrally connecting both divided bodies 40a and 40b from the outside by a coupling member, the peripheral edge of the shielding plate 30 is divided into the divided edges 41a of both divided bodies 40a and 40b.
It is fixed to 41b. [Effect] The shield plate can be easily fixed to the outer box.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disturbance wave prevention type transformer which prevents noise in a high frequency range superimposed on a commercial power source from entering electric equipment.

[0002]

[Prior Art]

 In general, in information equipment, medical equipment, audio equipment, control equipment, etc., in order to prevent the circuit of the equipment from being destroyed or the equipment from malfunctioning due to noise transmitted through the commercial power line, An obstacle wave prevention type transformer is interposed between the power supply and the power supply to prevent noise from entering the equipment.

Conventionally, as this type of transformer, an electrostatic shielded primary winding and secondary winding are wound around different locations of an iron core formed of a silicon steel plate having a low high-frequency effective magnetic permeability. In addition, there is known a structure in which a transformer main body, in which a non-ferrous metal good conductive shield plate is disposed between the primary winding and the secondary winding, is housed in a conductive outer box. With this configuration, the transformer body is covered by the outer box, and the primary winding and the secondary winding in the outer box are partitioned by the shield plate, so that the primary winding and the secondary winding are Since the electrostatic capacity between the secondary windings can be significantly reduced, it is possible to obtain a fault wave prevention type transformer capable of transforming only the commercial frequency component or a frequency component close to it.

However, in the case of the above-mentioned conventional transformer, the peripheral edge of the shielding plate is not in close contact with the wall surface of the outer box. Also, regarding the shield of the winding, it was difficult to reliably shield the lead wire part over the entire body, so it was inevitable that an incomplete part of the electrostatic shield would occur. Therefore, when using a transformer, the noise radiated from the lead wire of one winding repeatedly enters the other winding side through the gap between the peripheral edge of the shielding plate and the inner wall surface of the outer box while being repeatedly reflected on the wall surface of the outer box. There was a case that it penetrated into the lead wire of the winding. Moreover, stray capacitance existed between the primary winding and the secondary winding due to the gap existing between the periphery of the shielding plate and the inner wall surface of the outer box. Therefore, depending on the type of noise, the intrusion of noise could not be sufficiently prevented.

Therefore, in order to solve the above-mentioned drawbacks, the shield plate is formed to reach the inner wall surface of the outer box, and the peripheral edge of the shield plate is attached to the inner wall surface of the grounded outer box with an adhesive tape, an adhesive, or the like. A transformer was devised in which the lead wires of each winding were separately led out from the wall of the outer box. With this configuration, the primary coil and the secondary coil in the outer box can be partitioned in a sealed state by the shielding plate, so that the noise radiated from the lead wire of one coil is transmitted to the other coil side. It can be prevented from entering and the stray capacitance between the primary winding and the secondary winding can be made small.

[0006]

[Problems to be solved by the device]

 However, in the case of such a transformer, in order to fix the peripheral edge of the shielding plate to the inner wall surface of the outer box, after the transformer body is housed in the outer box, the core or winding is inserted from the opening in the upper part of the outer box. Since it had to be done by inserting a finger into a narrow space between the inner wall surface of the outer box and the like, workability was poor, and therefore fixing work required a great deal of work and the transformer was expensive. ..

Moreover, since it is only fixed with an adhesive tape or the like, the electrical connection between the shielding plate and the outer box is not sufficient, and therefore the electric resistance of the fixed portion becomes large, and the shield is shielded from the ground potential of the outer box accordingly. It was unavoidable that the potential of the plate increased and the shielding effect of the shielding plate against noise declined. Moreover, with such a fixing method, it is difficult to ensure that the peripheral edge of the shield plate is in close contact with the wall surface of the outer box, and it is easy for a minute gap to occur in some places, and the transformer is used for a long time. During this period, a new minute gap is likely to occur at the initial contact point, or the initial minute gap tends to gradually increase. Therefore, the stray capacitance existing between the primary winding and the secondary winding is noisy. Could not be reduced to such an extent that the conduction of electricity was not generated. Therefore, it was still insufficient as a disturbance wave prevention type transformer.

Regarding the transformer of this type, its construction is described in Japanese Patent Publication No. 59-41297 and Japanese Utility Model Publication No. 54-84523, but any of these publications has a shield plate. Although there is a statement that the outer box is integrally connected with screws, no specific structure is shown.

The present invention has been made to solve the above-mentioned conventional drawbacks, and an object thereof is to easily fix the peripheral edge of the shield plate to the wall surface of the outer box and to obtain a good electrical property. An object of the present invention is to provide a fault wave protection type transformer capable of being fixed in a statically connected state and in a state where no gap is generated.

[0010]

[Means for solving problems]

 That is, according to this invention, in order to achieve the above-mentioned object, the outer box enclosing the transformer body is divided into two divided bodies substantially at the position of the shield plate, and the periphery of the shield plate is arranged between the divided edges. By joining the two divided bodies together from the outside with a joining member, the peripheral edge of the shielding plate is fixed to the divided edges of the two divided bodies.

[0011]

[Work]

 Since it is configured as described above, the peripheral edges of the shielding plate can be fixed to the dividing edges of both divided bodies by integrally connecting the two divided bodies with the connecting member, and the peripheral edge of the shielding plate can be fixed to the outer box. Easy to fix to the wall. Moreover, since the peripheral edge of the shield plate is arranged between the dividing edges of the two division bodies, it is closely fixed to the dividing edge of the division body, and the shielding plate is in good electrical connection with the outer box. In addition, it can be fixed in a state where there is no gap.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. A is a transformer body, and B is an outer box that encloses the transformer body A. That is, in the transformer main body A, the primary winding 21 is wound around one of the yoke portions 11a and 11b of the iron core 10 formed by layering a silicon steel sheet having a low high frequency effective magnetic permeability. Further, the winding portions 22a and 22b of the secondary winding 22 including the two winding portions 22a and 22b which are separately formed so as to have the same inductance are wound around both the leg portions 12a and 12b. A conductive shield plate 30 made of a non-magnetic material such as aluminum is provided between the secondary winding 21 and the secondary windings 22a and 22b except for the core 10. There is. Reference numerals 23 and 24 denote lead wires of the windings 21 and 22, and reference numerals 25 and 26 denote mounting legs to the outer box B fixed to the lower portion of the iron core 10.

In the above description, although not shown, the winding portions 22a and 22b of the primary winding 21 and the secondary winding 22 have their outer surfaces entirely covered with a good conductor to prevent noise from being conducted by electromagnetic radiation. is doing. The winding portions 22a and 22b of the secondary winding 22 are connected in parallel or in series. In this case, for example, the winding part 22a is left-handed and the winding part 22b is right-handed so that the polarities thereof match when connected. In addition, the shielding plate 30 inserts the E-shaped plate piece 31a from one side to the other side of the iron core 10 and superimposes the I-shaped plate piece 31b on the tip of the plate piece 31a. Aluminum foil 32 is connected to the peripheral portions of the piece 31a and the I-shaped plate piece 31b by soldering or welding so that the peripheral edge is formed to reach the outside of the wall surface of the outer box A. In that case, the E-shaped plate piece 31a and the I-shaped plate piece 31b are arranged so that no gap is formed between the E-shaped plate piece 31a and the I-shaped plate piece 31b. And the overlapping portion of the aluminum foils 32 at that portion is overlapped with each other through the insulating layer 33 so that the shielding plate 30 does not form a closed circuit of current.

On the other hand, the outer box B is formed of a conductive material into a rectangular parallelepiped, and the wall surface of the outer box B is divided at the position of the approximately shield plate 30 of the transformer main body A, so that the two divided bodies 40 a, 40b. Further, on the two opposite sides of each divided body 40a, 40b, flange pieces 42a, 43a, 42b, 43b are provided outwardly at the divided edges 41a, 41b, and at the same time, bolt holes 44a, 44b are arranged in a row. Reference numerals 45 and 46 denote strip-shaped plate pieces that are abutted over the wall surfaces of the other two sides of the two divided bodies 40a and 40b facing each other when the two divided bodies 40a and 40b are joined, and screw holes 47 and 48 are formed on both side edges in the longitudinal direction. Further, screw holes 49 and 50 are provided in rows at the positions where the wall surfaces of the two divided bodies 40a and 40b are abutted, respectively, at positions corresponding to the screw holes 47 and 48. Reference numerals 51 and 52 are lead-out wire lead-out holes formed on the opposing wall surfaces of the divided bodies 40a and 40b.

In order to cover the transformer body A configured as described above with the outer box B, first, the transformer body A is housed and fixed in one of the split bodies 40a of the outer box B, and The peripheral edge of the shielding plate 30 of A is positioned on the division edge 41a of the division body 40a. Next, the two divided bodies 40a, 40b are abutted so that the divided edge 41a of the divided body 40a and the divided edge 41b of the other divided body 40b match, and then the collar pieces 42a, 43a of the two divided bodies 40a, 40b. , 42b, 43b, the bolt 53 is inserted into the bolt holes 44a, 44b, and a nut 54 is screwed into the bolt 53 to be tightened. On the other two sides of the split bodies 40a, 40b, plate pieces 45, 46 is attached, and a screw (not shown) is screwed into the screw holes 49 and 50 through the screw holes 47 and 48 of the screw 46.

By doing so, at the locations of the collar pieces 42a, 43a, 42b, 43b of the divided bodies 40a, 40b, the collar pieces 42a, 43a, 42b which are the division edges 41a, 41b of the divided bodies 40a, 40b. , 43b pinch the peripheral edge of the shield plate 30, so that the peripheral edge of the shield plate 30 is tightly fixed to the collar pieces 42a, 43a, 42b, 43b, and the plate pieces 45, 46 are attached. At the location, the peripheral edges of the shield plate 30 protruding outward from the wall surfaces of the two divided bodies 40a and 40b are pinched by the wall surfaces of the divided bodies 40a and 40b and the plate pieces 45 and 46, whereby the peripheral edges of the shield plate 30 are divided. The outer box B is divided into a primary winding chamber 1 and a secondary winding chamber 2 by a shield plate 30 while being closely fixed to the dividing edges 41a and 41b of the bodies 40a and 40b. The lead wire 23 of the primary winding 21 is led out through the lead-out hole 51, and the lead wire 24 of the secondary winding 22 is led out through the lead-out hole 52.

In the above, the secondary winding 22 of the windings 21 and 22 is divided into two winding portions 22a and 22b, and the windings 21 and 22 are wound around the iron core 10 as described above. The case where the transformer main body A is mounted is shown. In addition to this, as shown in FIG. 3, for example, one leg 12a of the iron core 10 is provided with the primary winding 21 and the other leg 12b is provided. The transformer main body A may be configured by winding the secondary winding 22. In such a configuration, the outer box B is divided into left and right parts.

Further, in the above case, the two divided bodies 40a, 40b of the outer box B have the two opposing sides with the flange pieces 42a, 43a, 42b, 43b, and the other two opposite sides with the plate pieces 45, 46. Although it is configured to be integrally connected by connecting via both sides, the four sides of both divided bodies may be connected via a flange piece or a plate piece, and the connecting means of both divided bodies is as described above. It is not limited to the configuration.

In the above case, the shielding plate 30 is configured such that the aluminum foil 32 is connected to the peripheral portions of the plate pieces 31a and 31b. However, in this configuration, the peripheral portion of the shielding plate is flexible. Since it is formed in a flexible state, it becomes extremely easy to pinch between the collar pieces and between the wall surface of the divided body and the plate piece when fixing to the outer box, and the peripheral edge of the shielding plate is It has the advantage that it can be more easily fixed to the wall.

[0020]

[Effect of the device]

 As described above, according to the present invention, the outer box that encloses the transformer body is divided into two divisions at the position of the shield plate, and the periphery of the shield plate is arranged between the divided edges to divide the two. Since the peripheral edge of the shielding plate was fixed to the dividing edges of the two divided bodies by integrally connecting the body from the outside with a connecting member, it is necessary to fix the peripheral edge of the shielding plate to the wall surface of the outer box from the outer side of the outer box. Easy to do.

Moreover, since the peripheral edge of the shielding plate is arranged between the divided edges of both divided bodies, the shielding plate comes into close contact with the divided body due to the coupling of both divided bodies, and a good electrical connection state is achieved. Can be fixed to. Therefore, the electric resistance of the fixed portion becomes small, so that the shield plate has almost the same potential as the outer box potential, and the noise shield effect of the shield plate can be enhanced.

Moreover, since the shield plate is fixed to both of the divided bodies in a state where the peripheral edge is arranged between the divided edges of the divided bodies, there is a gap in the fixing and the transformer is used for a long period of time. There is no possibility that a gap will be generated at the fixed position during the operation, so that the stray capacitance between the primary winding and the secondary winding can be maintained at a small value for a long period of time.

Since the shield plate and the divided body are in intimate contact with each other and fixed, there is also an effect that the heat dissipation action of the transformer main body through the shield plate and the outer box is promoted.

Therefore, according to the present invention, it is possible to provide at low cost a disturbance wave prevention type transformer having an excellent noise blocking effect.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the assembly of FIG. 1 assembled.

FIG. 3 is a vertical sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 A Transformer body B Outer box 10 Iron core 21 Primary winding 22 Secondary winding 30 Shielding plate 40a 40b Dividing body 41a 41b Dividing edge 45 46 Coupling member (rectangular plate piece) 53 Coupling member (bolt) 54 Coupling member ( nut)

Claims (1)

[Claims for utility model registration] [Claim 1] A primary winding 21 and a secondary winding 22 are wound around different positions of an iron core 10, and the primary winding 21 and the secondary winding 2 are wound.
In the transformer in which the transformer body A in which the shield plate 30 is disposed between the two is covered by the outer box B, the outer box B is divided into two split bodies 40a and 40b at approximately the position of the shield plate 30. ,
The peripheral edge of the shield plate 30 is arranged between the divided edges 41a and 41b, and the divided bodies 40a and 40b are integrally coupled from the outside by a coupling member, so that the shield plate 30 is formed.
Are divided edges 41a, 41 of the two divided bodies 40a, 40b.
Obstacle prevention type transformer fixed to b.