JPH082995Y2 - Current transformer - Google Patents

Description

[Detailed description of the device]

[0001]

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

[0002]

2. Description of the Related Art A conventional current transformer will be described below with reference to the drawings.

A perspective view of the conventional current transformer of FIG. 3,
As shown in the bobbin assembly diagram of FIG. 4, a conventional current transformer is provided with a magnetic material insertion hole 13a for penetrating a magnetic material in a plate-shaped lower bobbin 1 made of a plastic molded product.
A recessed portion 8 into which a primary coil 4 having a substantially U-shaped upper surface and bent at the center of both front end legs downward at a right angle is fitted.
Is provided, a primary coil insertion hole 14 through which both ends of the primary coil 4 are inserted and penetrated, a step 15 is provided in the magnetic material insertion hole 13a, and a magnetic field is provided on the lower surface of the lower bobbin 1. A pair of lower end flanges 7a through the material insertion holes 13a,
7b are provided, several pin terminals 9 are planted in one lower end flange 7a, and the upper bobbin 2 is provided on the side surface of the lower end flanges 7a, 7b.
An engaging step 17 to which is fixed is provided.

The tips of both legs of the primary coil 4 of the lower bobbin 1 are inserted into the primary coil insertion holes 14 and are gradually pushed to be housed in the recesses 8. When pushed to the end, the primary coil 4 is pushed from the lower surface of the lower end flange 7b. The tip of the coil protrudes by the specified size, and the assembly process of the primary coil 4 is completed.

Next, the upper bobbin 2 will be described. A magnetic material insertion hole 13b for inserting the magnetic material 5 is provided at the center, a cylindrical portion 12 made of a plastic molded product is provided on the outer circumference, and upper and lower flanges 6 are provided at the upper and lower ends thereof, respectively. , Lower end collar 7c is provided. Further, a lead groove 18 through which a lead wire is passed is provided on the side surface of the lower end flange 7c, and convex portions 11 with which the engaging step 17 of the lower bobbin 1 abuts are provided on both side surfaces thereof. Also, the lower end collar 7
On the lower surface of c, there are provided a protrusion 10a that fits into the step 15b provided in the magnetic material insertion hole 13a of the lower bobbin 1, and a protrusion 10c that fits into the step 15b provided on the lower end flanges 7a and 7b. A protrusion 10b having a structure for pressing the primary coil 4 housed in the recess 8 is provided.
The upper bobbin 2 is fitted to the lower bobbin 1 which is completed by assembling the primary coil 4 from above, and the engaging step 1 of the lower bobbin 1 is engaged.
7, the convex portion 11 of the upper bobbin 2 is pushed in, fixed and integrated into a bobbin, and a copper wire is wound around the bobbin 2 to form the secondary coil 3.
After the lead wire pulled out from the next coil 3 is soldered to the root of the pin terminal 9 through the lead groove 18, the magnetic material 5 is incorporated into the magnetic material insertion hole 13 to complete the current transformer.

[0006]

As described above, in the conventional structure, the primary coil 4 having a substantially U-shape whose tip is bent at a right angle is provided.
After inserting the tips of both legs into the primary coil insertion hole 14 of the lower bobbin 1, the assembly is performed by gradually pushing in.
Assembly work takes time and productivity is very poor. Also,
If the insertion balance of both legs of the primary coil 4 is different,
There is a possibility that the primary coil 4 may be distorted and deformed due to the external pressure at the time of pushing, and that the looseness may occur when the lower bobbin 1 and the upper bobbin 2 are fitted. Furthermore, cracks may occur in the lower bobbin 1 due to the pushing pressure, and there is a risk of causing insulation failure between the primary coil 4 and the magnetic material 5. For the presence or absence of cracks, a visual appearance inspection was required, and it was difficult to automate the assembly process.

The present invention solves the above-mentioned problems of the prior art by providing a current transformer having a higher productivity and a higher safety by facilitating the incorporation of the primary coil to improve the productivity and eliminating the bobbin crack. The purpose is to provide.

[0008]

In order to achieve this object, a means of the present invention is to provide a lower bobbin for a primary coil with a pin terminal on one lower end flange facing a hole penetrating a magnetic material. A large number of plants were planted, and on the opposite side, a thick conductor with a substantially U-shape and the center of both ends of the tip bent downward at a right angle 1
A recess into which the next coil fits and a groove into which the bent U-shaped tip fits downward are provided, and the above-mentioned U-shaped conductor is fitted to this lower bobbin. Has a cylindrical portion around which the secondary coil is wound,
An upper end flange and a lower end flange are provided at both upper and lower ends of the tubular portion, and a substantially U-shaped conductor fitted in the center of the recess of the lower bobbin is pressed onto the lower end flange of the lower bobbin and the recess of the lower bobbin is pressed from both sides. The upper bobbin provided with a substantially E-shaped projection to be sandwiched is fitted and fixed to the lower bobbin.

[0009]

With this structure, the lower bobbin and the primary coil are assembled by simply fitting the substantially U-shaped primary coil with the bent tip into the recesses on the groove provided on the upper surface of the lower bobbin and the side surface of the lower end collar. It can be performed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a current transformer showing an embodiment of the present invention, and FIG. 2 is an assembly view of the bobbin. As shown in the figure, a plate-like lower bobbin 1 made of a plastic molded product is provided with a magnetic material insertion hole 13a for penetrating the magnetic material 5, and a substantially U-shape is formed on the upper surface so that the center of the front and rear leg portions is bent downward at right angles. A recess 8 is provided in which the primary coil 4 made of the conductor is fitted. Further, the step 15 is formed in the magnetic material insertion hole 13a.
And a magnetic material insertion hole 13a is provided on the lower surface of the lower bobbin 1.
A pair of lower end flanges 7a and 7b are provided through the above, and several pin terminals 9 are planted in one lower end flange 7a. Also,
Two groove-shaped primary coil insertion grooves 16 into which both front end legs of the primary coil 4 fit are provided on the side surface of the other lower end flange 7b opposite to the magnetic material insertion hole 13a. Also, the lower end collars 7a, 7
An engaging step 17 to which the upper bobbin 2 is fixed is provided on the side surface of b. The primary coil 4 is fitted and housed in the recess 8 and the primary coil insertion groove 16 of the lower bobbin 1, and the assembly process of the lower bobbin 1 and the primary coil 4 is completed.

Next, the upper bobbin 2 will be described. A magnetic material insertion hole 13b for inserting the magnetic material 5 is provided at the center, a cylindrical portion 12 made of a plastic molded product is provided on the outer periphery, and upper and lower ends thereof are provided with upper end flanges, respectively. 6, lower end collar 7c is provided.
Further, a lead groove 18 through which a lead wire is passed is provided on the side surface of the lower end flange 7c, and convex portions 11 that come into contact with the engaging step 17 of the lower bobbin 1 are provided on both end side surfaces thereof. Also, the lower end collar 7
On the lower surface of c, there are provided a protrusion 10a which is inserted into the step 15b provided in the magnetic material insertion hole 13a of the lower bobbin 1, and a protrusion 10c which is structured to fit into the step 15a provided at the lower end flanges 7a and 7b. A protrusion 11b having a structure for pressing the primary coil 4 housed in the recess 8 is provided.
The upper bobbin 2 is fitted to the lower bobbin 1 which is completed by assembling the primary coil 4 from above, and the engaging step 1 of the lower bobbin 1 is engaged.
7. The bobbin, which is formed by pressing and fixing the convex portion 11 of the upper bobbin 2, is wound with a copper wire to form the secondary coil 3, and the lead wire pulled out from the secondary coil 3 is passed through the lead groove 18 to form a pin terminal. After the solder connection to the root of 9, the magnetic material 5 is incorporated into the magnetic material insertion hole 13 to complete the current transformer.

[0013]

As described above, according to the present invention, the lower bobbin for the primary coil has a recess for inserting the primary coil, and the lower bobbin has a lower end flange and side surfaces of the lower end of the primary coil. With the configuration having the groove portion for inserting the portion, the primary coil can be assembled by simply fitting the primary coil into the recesses on the groove provided on the upper surface of the lower bobbin and the side surface of the lower end collar, It is not necessary to press the primary coil and press-fit it, and productivity can be improved. Further, by eliminating the external stress of press-fitting, deformation of the primary coil and bobbin cracks can be eliminated, and insulation failure can be eliminated. Furthermore, after assembling the lower bobbin and the primary coil,
This makes it possible to provide a current transformer with higher productivity and safety, which does not require visual appearance inspection and allows automation of assembly.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a current transformer of the present invention.

FIG. 2 is an exploded perspective view of a bobbin showing an embodiment of the present invention.

FIG. 3 is a perspective view showing a conventional example.

FIG. 4 is an exploded perspective view of a bobbin showing a conventional example.

[Explanation of symbols]

 1 Lower bobbin 2 Upper bobbin 3 Secondary coil 4 Primary coil 5 Magnetic material 6 Upper end collar 7 Lower end collar 8 Recess 9 Pin terminal 10 Protrusion 11 Convex 12 Cylindrical part 13 Magnetic material insertion hole 14 Primary coil insertion hole 15 Step 16 primary coil insertion groove 17 step for engagement 18 lead groove

Claims (1)

[Scope of utility model registration request] 1. A flat plastic molded product having a hole through which a magnetic material penetrates in the center, and several pin terminals are planted on one lower end flange facing the hole penetrating the magnetic material on the lower surface thereof. In addition, on the upper surface on the opposite side, a concave portion into which a primary coil made of a thick conductor having a substantially U shape and the center of both tip leg portions bent downward at a right angle fits, and a substantially U-shaped tip bent downward A lower bobbin provided with a groove for fitting the above-mentioned substantially U-shaped conductor, and further having a cylindrical portion made of a plastic molded product in which a magnetic material is penetrated in the center and a secondary coil is wound on the outer periphery. An upper end flange and a lower end flange are provided at both upper and lower ends of the tubular portion, and a substantially U-shaped conductor fitted in the center of the recess of the lower bobbin is pressed on the lower surface of the lower end flange and the recess of the lower bobbin is formed. An upper button equipped with a roughly E-shaped protrusion that is sandwiched from both sides. The emissions were fixedly fitted to the lower bobbin current transformer.