JPH06302438A - Transformer - Google Patents

Abstract

PURPOSE:To provide a high-safety and high-quality transformer, in a transformer used for each kind of electric apparatus. CONSTITUTION:A bobbin 16 has a magnetic material 10 inserted in the center, and has a tubular part 1 around which to wind a coil, and is provided with middle collar 4, a left collar 3, and a right collar 2, and further the right collar 2 and the middle collar 4 are provided with cuts 8 and 9 in which the insulating walls 15c, 15d, and 15e of a pair of insulating covers 15a and 15b provided in a case 14 are to be set, and a plurality of ribs are provided at the faces contacting with a magnetic material 10 of these insulating covers 15a and 15b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer used in various video equipment, home appliances, audio equipment, industrial equipment, communication equipment and the like.

[0002]

2. Description of the Related Art A conventional transformer has a structure as shown in the assembly view of FIG. 5 and the sectional views of FIGS. Referring to FIG. 5, the transformer body is the bobbin 1.
A primary coil 12 and a secondary coil 13 are wound around the intermediate collar portion 4 with a lead wire 6a, 6b soldered to the respective pin terminals 5a, 5b through guide grooves 7a, 7b. Further, the magnetic material 10 of EE type or EI type is inserted into the hole 11 into which the magnetic material 10 is inserted to complete the transformer body.

A transformer having a structure in which the completed transformer body is housed in a case 14 provided with a pair of insulating covers 15a and 15b to form a finished product. The bobbin 16 has a hole 11 into which the magnetic material 10 is inserted, and a cylindrical portion 1 around which a coil is wound around the hole 11. A middle flange 4 is provided on the outer periphery of the center of the tubular portion 1, a left flange 3 is provided on the outer periphery of the left end, and a right flange 2 is provided on the outer periphery of the right end. The left flange 3 has a guide groove 7a through which the lead wire 6a of the secondary coil 13 wound between the left flange 3 and the middle flange 4 is inserted, and a pin terminal 5a made of metal is implanted.

Like the left collar 3, the right collar 2 has a guide groove 7b through which the lead wire 6b of the primary coil 12 wound between the right collar 2 and the middle collar 4 is inserted, and is a pin terminal made of metal. Plant 5b. Further, the right flange 2 is provided with a notch 9 into which the insulating wall 15d of the pair of insulating covers 15a and 15b provided on the case 14 is fitted. Further, a pair of insulating covers 1 provided on the case 14 is provided on the middle collar 4 provided on the outer periphery of the center of the tubular portion 1.
A middle collar notch 8 into which the insulating walls 15d and 15e of 5a and 15b are fitted is provided.

Next, a case 1 made of a plastic molded product.
4 will be described. The case 14 has a box-like shape with one end open, and is provided with insulating covers 15a and 15b composed of a pair of U-shaped thin insulating walls 15c and 15d extending vertically from the bottom 17 toward the opening. The pair of insulating walls 15d are located between the middle flange 4 and the right flange 2 of the bobbin 16 at both sides of the primary coil 12.

The insulating wall 15e has a structure in which it is fitted in the middle flange notch 8 provided on the lower surface of the central outer periphery of the middle flange 4. The secondary coil 13 is wound around the tubular portion 1 between the left collar 3 and the middle collar 4 of the bobbin 16 thus completed, and the lead wire 6a thereof is formed.
Is wound around a pin terminal 5a vertically planted in the left collar 3 through a guide groove 7a provided in the left collar 3.

A primary coil 12 is wound around a cylindrical portion 1 between the middle collar 4 and the right collar 2, and a lead wire 6b is vertically planted in the right collar 2 through a guide groove 7b provided in the right collar 2. Pin terminal 5
It is wrapped around b. After that, the lead wires 6a and 6b wound around the pin terminals 5a and 5b are connected by soldering. Further, the magnetic material 10 of EE type or Ei type is inserted into the hole 11 into which the magnetic material 10 is inserted.

The transformer main body thus completed is inserted and fitted through the opening of the case 14 and housed in the case 14. At this time, the bottom portion 1 of the case 14 is provided on both sides of the notch 8 provided in the middle collar 4 of the bobbin 16 and the right collar notch 9 provided in the right collar 2.
The U-shaped 1 that rises vertically from 7 toward the opening
The pair of insulating covers 15a and 15b are fitted, inserted and fitted to the end, and the transformer body is housed to complete the product.

[0009]

Generally, a transformer has to meet safety standards depending on its use, type, capacity, and other reasons. In such a transformer, it is necessary to satisfy various regulations such as the structural aspect, the material aspect, the electrical performance aspect, and the like. Especially in terms of structure, 1
Insulation thickness between secondary coil and secondary coil, primary coil and magnetic material,
Insulation distance (creeping distance) is regulated, for example IEC
According to the standard, the insulation thickness is 0.4 tmin. Insulation distance 6.0 mm min. is necessary.

A cross-sectional view of a conventional transformer will be described with reference to FIGS. 7 and 8. FIG. 7 is a cross-sectional view taken perpendicularly to the magnetic material 10. The insulation distance between the primary coil 12 and the secondary coil 13 which is a problem is that the middle collar notch 8 provided in the center of the middle collar 4 is
It has a structure in which a plastic insulating wall 15e rising from the bottom 17 of the case 14 is fitted inside, and includes a clearance j provided between the plastic insulating cover 15a and the magnetic material 10. Insulation distance (creeping distance) = a + b + c + d + d
-2j is the min dimension.

Next, FIG. 8 is a sectional view of the magnetic material 10 taken horizontally. Since the secondary coil 13 is not insulated from the magnetic material 10, it is considered to have the same potential. Therefore problem 2
The insulation distance between the secondary coil 13 and the primary coil 12 is the magnetic material 10
Insulation distance (creeping distance) = b + c + e + f−k including the clearance k provided between the plastic insulating cover 15a and the magnetic material 10 which is replaced by the insulation distance of the primary coil 12 and
Is the min dimension.

[0012] If AC240V is applied in conformity with the IEC standard and in the structure as described above, in order to secure an insulation distance of 6.0 mm between the primary coil 12 and the secondary coil 13, a space between the plastic insulating wall cover 15a and the magnetic material 10 is secured. When the transformer main body is housed in the case 14, the clearances j and k provided on the magnetic disk 10 have a minimum value, and a large friction is generated between the plastic insulating cover 15a and the magnetic material 10, and the workability is largely hindered by being caught.

Further, if the clearances j and k provided between the plastic insulating wall cover 15a and the magnetic material 10 are made large, the workability is improved, but the insulation distance required by the safety standard cannot be secured, which conflicts with each other. I have a problem.

As described above, in order to secure the insulation distance, the wall thicknesses of the middle collar 4 and the right collar 2 are increased to compensate for the clearances j and k provided between the plastic insulating cover 15a and the magnetic material 10. In addition, since the depth of the notch 8 is made deeper, the strength becomes insufficient, and the winding area of the primary coil 12 and the secondary coil 13 is reduced, and the voltage fluctuation rate is deteriorated due to the reduction of the used copper wire diameter. In addition to the deterioration of electric performance such as the decrease of capacity, there are drawbacks such as the restriction of the structure design and the deterioration of disconnection quality due to thinning.

An object of the present invention is to eliminate the above-mentioned conventional drawbacks and provide a transformer having a simple structure and safety.

[0016]

A transformer according to the present invention for solving the above-mentioned problems is provided with a notch formed on the outer periphery of the middle and right flanges of the bobbin. By housing the transformer main body in a case with a structure in which a plastic molded product is provided with an insulating wall, and a plurality of convex ribs are provided on the surface of the insulating wall that contacts the magnetic material, the notch and the insulating wall are fitted together. It is configured to secure an insulation distance.

[0017]

The function of this technical means is as follows.
That is, the insulating distance between the primary coil and the secondary coil or the magnetic material is such that the insulating wall of the plastic case fits into the U-shaped notches provided on the outer periphery of the middle and right collars, When the transformer main body is housed in the case by the plurality of convex ribs provided on the surface of the insulating wall that contacts the magnetic material, the convex portions provided on the insulating wall are pushed by the magnetic material, and the outer circumference of the middle and right flanges is pushed. The tip of the insulating wall is pushed into the notch provided in and is fitted into the notch. Further, when the transformer body is housed in the case, the contact portion between the insulating wall and the magnetic material can be reduced to only the convex portion from the entire surface of the insulating wall in contact with the magnetic material.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a diagram showing a structure of a transformer main body and a case before assembly according to an embodiment of the present invention. FIG. 2 (A)-
(C) is a figure which shows the cross section after the assembly of this invention. Further, FIGS. 3 and 4 are views showing a partial enlargement of FIG.

In FIG. 1, in the transformer body, a primary coil 12 and a secondary coil 13 are wound around a bobbin 16 with a middle collar 4 interposed therebetween, and their lead wires 6a, 6b pass through guide grooves 7a, 7b respectively to respective pin terminals 5a. , 5b by soldering.
Further, the magnetic material 10 of EE type or EI type is used as the magnetic material 10.
Is inserted into the hole 11 of the bobbin 16 into which the is inserted to complete the transformer body. The transformer main body thus completed is housed in a case 14 provided with a pair of insulating covers 15a and 15b to form a finished product.

The bobbin 16 has a hole 11 into which the magnetic material 10 is inserted, and a cylindrical portion 1 around which a coil is wound. A middle collar 4 is provided on the outer periphery of the center of the tubular portion 1, a left collar 3 is provided on the outer periphery of the left end, and a right collar 2 is provided on the outer periphery of the right end.
To provide. A pin terminal 5a made of metal having a guide groove 7a through which the lead wire 6a of the secondary coil 13 wound between the left flange 3 and the middle flange 4 is inserted is planted in the left flange 3.

Like the left flange 3, the right flange 2 has a guide groove 7b through which the lead wire 6b of the primary coil 12 wound between the right flange 2 and the middle flange 4 is inserted, and is a pin terminal made of metal. Plant 5b. The right flange 2 is provided with a notch 9 into which the insulating wall 15d of the pair of insulating covers 15a and 15b provided on the upper case 14 is fitted. Further, a pair of insulating covers 1 provided on the case 14 is provided on the middle collar 4 provided on the outer periphery of the center of the tubular portion 1.
A middle collar notch 8 into which the insulating walls 15d and 15e of 5a and 15b are fitted is provided.

Next, a case 1 made of a plastic molded product.
4 will be described. The case 14 has a box-like shape with one end open, and is provided with insulating covers 15a and 15b composed of a pair of U-shaped thin insulating walls 15c and 15d vertically extending from the bottom 17 toward the opening. A plurality of convex ribs are provided on the surfaces of the insulating covers 15a and 15b that are in contact with the magnetic material 10. The pair of insulating walls 15d is the bobbin 1
It is located at a position corresponding to both side surfaces of the primary coil 12 between the middle flange 4 and the right flange 2 of 6. Further, the insulating wall 15e has a structure to be fitted in the middle collar notch 8 provided on the lower surface of the center outer periphery of the middle collar 4.

The secondary coil 13 is wound around the cylindrical portion 1 between the left flange 3 and the middle flange 4 of the bobbin 16 thus completed, and its lead wire 6a passes through the guide groove 7a provided in the left flange 3. It is wound around a pin terminal 5a vertically planted on the left collar 3. In addition, the primary coil 1 is provided in the tubular portion 1 between the middle collar 4 and the right collar 2.
2 is wound and the lead wire 6b is a guide groove 7b provided on the right brim 2.
It is wound around the pin terminal 5b vertically planted on the right collar 2. After that, the lead wires 6a and 6b wound around the pin terminals 5a and 5b are connected by soldering.

Further, the magnetic material 10 of EE type or Ei type is inserted into the hole 11 into which the magnetic material 10 is inserted. The transformer main body thus completed is inserted and fitted through the opening of the case 14 and housed in the case 14. At that time, the notch 8 provided in the middle collar 4 of the bobbin 16 and the right collar notch 9 provided in the right collar 2
A pair of U-shaped insulating covers 15 vertically rising from the bottom 17 of the case 14 toward the opening on both sides of the inside of the case.
Insert a and 15b and insert and fit until the end.

2A to 2C are sectional views of the transformer assembled as described above. The insulation distance between the primary coil 12 and the secondary coil 13 will be described with reference to the enlarged view of FIG. Case 1 in the middle collar notch 8 provided in the center of the middle collar 4.
Plastic insulating wall 15e rising from the bottom 17 of 4
Is a structure in which the primary coil 12 and the secondary coil 13 are separated by the inner collar 4. Therefore, the insulation distance between them can be replaced with the creepage distance of the middle collar 4, and the insulation distance (creeping distance) = a + b + c + d + d. As a result, the thickness b of the insulating wall 15e can be made as thin as possible and the depth d can be increased to reduce the thickness A of the intermediate collar 4.

Next, the insulation distance between the primary coil 12 and the magnetic material 10 will be described with reference to FIG. Basically, the insulation distance between the primary coil 12 and the secondary coil 13 is required. However, since there is no insulation between the secondary coil 13 and the magnetic material 10, they are considered to have the same potential. Therefore, a method for ensuring an insulation distance between the primary coil 12 and the magnetic material 10 will be described. As in the case of FIG. 3, the middle flange 4 is provided with a middle flange notch 8 in which an insulating wall 15d rising from the bottom 17 of the case 14 is fitted.

As a result, the primary coil 12 through the middle collar 4
Insulation distance between the magnetic material 10 and the magnetic material 10 (creeping distance) = b + c + e +
Since the thickness of the insulating wall 15d is f, and the thickness b of the insulating wall 15d is as thin as possible and the depth f is large, it is possible to satisfy the insulating distance and reduce the thickness A of the intermediate collar 4.

Next, the primary coil 12 of the right collar 2 and the magnetic material 10
The insulation distance from Right collar notch 9 provided on the right collar 2
Is provided, and an insulating wall 15d that rises vertically from the bottom portion 17 of the case 14 is fitted therein. As a result, the insulation distance (creeping distance) = g + h + i. Therefore, the thickness h of the insulating wall 15d is made as thin as possible and its depth i
The insulation distance is satisfied by increasing the
The wall thickness B of can be reduced. A so-called bobbin collar is provided with a notch, and a dissimilar plastic molded product is fitted into the notch to increase the creepage dimension, thereby ensuring the insulation distance.

[0029]

As described above, according to the present invention, the insulation distance between the primary coil, the secondary coil and the magnetic material is made of different plastics in the notch of the middle flange and the notch of the right flange. It has a structure that secures reliable insulation by fitting a V-shaped insulation wall and suppressing the convex ribs provided on the insulation wall with a magnetic material. While satisfying, it is possible to reduce the wall thickness of the middle flange and the wall thickness of the right flange, and to improve the coil winding area within the magnetic material window area. Therefore, it is possible to use a copper wire having a large wire diameter, which improves electrical performance such as efficiency, voltage fluctuation rate, and capacity, and also greatly improves the degree of freedom in design with respect to the performance required by the user. Also in terms of quality, there are great merits such as disconnection defects being reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a transformer body before assembly and a plastic case for housing the transformer body according to an embodiment of the present invention.

2A to 2C are cross-sectional views of the transformer after assembly according to the present invention.

FIG. 3 is a partially enlarged view showing an insulating structure of a primary coil and a secondary coil after assembly according to the present invention.

FIG. 4 is a partially enlarged view showing an insulating structure of the primary coil and a magnetic material (secondary coil).

FIG. 5 is a perspective view of a conventional transformer body before assembling and a plastic case for housing it.

6A to 6C are cross-sectional views of a conventional transformer after assembly.

FIG. 7 is a partially enlarged view showing an insulating structure of a primary coil and a secondary coil.

FIG. 8 is a partially enlarged view showing an insulating structure of a primary coil and a magnetic material (secondary coil).

[Explanation of symbols]

 1 Cylindrical part 2 Right flange 3 Left flange 4 Middle flange 5a Pin terminal provided on the left flange 5b Pin terminal provided on the right flange 6a Secondary coil lead wire 6b Primary coil lead wire 7a Left flange guide groove 7b Right flange guide Groove 8 Middle collar notch 9 Right collar notch 10 Magnetic material 11 Hole into which magnetic material is inserted 12 Primary coil 13 Secondary coil 14 Case 15a Insulation cover 15b Insulation cover 15c Insulation wall 15d Insulation wall 15e Insulation wall 16 Bobbin 17 Bottom 18 Convex rib

Front page continuation (72) Inventor Toyo Tamura 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A bobbin tubular portion made of a plastic molded product having a magnetic material penetrating through the center thereof and a primary coil and a secondary coil wound around the outer periphery thereof, and a left end is provided on the outer peripheral portions of both end surfaces of the tubular portion. A tsuba and a right tsuba are provided, and a middle tsuba is provided at the center of the tsuba.
A pair of insulating covers, which are U-shaped from one of the collars to the middle collar and which fit into the notches of the collar, are integrated into a case, and the insulating cover is provided on the surface contacting the outer legs of the magnetic material. A transformer that has a plurality of convex ribs, and the insulating cover of the case is fitted into one side of the bobbin and the middle side of the bobbin to house the transformer body in the case.