JPH064564Y2 - Coil block - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Field of the Invention >> The present invention relates to a coil block used in an electromagnetic relay or the like and having excellent withstand voltage.

<Outline of the Invention> The present invention has a concave portion formed on the coil facing surface of the yoke along the winding direction of the coil, which is the closest point to the coil core wire and near the flange. It is intended to secure the withstand voltage by increasing the space distance, creepage distance and the like.

<< Prior Art and Its Problems >> As a coil block used in an electromagnetic relay, a coil core wire is wound around the outer periphery of a spool having flanges on both ends, and a coil tape for insulation protection is wound on the coil core wire, and A coil block is known in which an iron core is inserted into the center of a spool to form a magnetic pole surface, and L-shaped or U-shaped yokes are arranged to face each other along the winding direction of the coil core wire.

In such a coil block, since the coil core wire and the yoke are close to each other, the withstand voltage breakdown is likely to occur in the proximity portion, and in order to prevent this, conventionally, the insulating protection tape as described above is used. It is wound on the coil core wire, but at the flange parts at both ends of the spool, the winding position is misaligned because the winding of the coil tape is difficult and the coil core wire cannot be completely covered. However, there is a problem that it is impossible to prevent the breakdown of the withstand voltage.

On the other hand, as a method for strengthening the winding of the coil tape near the flange to secure the withstand voltage, for example, the actual open sho 61-
The one shown in Japanese Patent No. 79439 is known.

As shown in FIG. 4 and FIG. 5, this coil block can be formed by forming the inner side surfaces of the flange 2 at both ends of the spool 1 in two steps, and winding a coil tape (not shown) on this step portion 3 in a stacked manner. Thus, the coil core wire 4 is intended to completely cover the vicinity of the flange 2.

However, when the coil block is configured as described above, a space for forming the step portion 3 inside the flange 2 is required, and the winding space of the coil core wire 4 is reduced by this space, It has a drawback that a large magnetic force cannot be obtained.

<Purpose of Invention> The present invention has been made in view of the above problems, and the purpose thereof is to reduce the winding space of the coil core wire, that is, without reducing the magnetic force. An object of the present invention is to provide a coil block that can prevent breakdown of withstand voltage in the vicinity.

<< Structure and effect of device >> In order to achieve the above-mentioned object, this device has a coil core wire wound around the outer circumference of a spool having flanges at both ends, and the coil core wire is covered with a coil tape for insulation protection. A coil block in which the yokes are arranged close to each other and face each other along the winding direction of the coil, the coil facing surface of the yoke being the maximum proximity point to the coil core wire, and the flange It is characterized in that a concave portion is formed in the vicinity thereof.

As described above, according to the present invention, since the recess is formed in the yoke where the breakdown voltage is most likely to occur, that is, in the vicinity of the flange and where the maximum proximity to the coil core wire is formed, the maximum proximity state of the coil core wire and the yoke is achieved. Therefore, it is possible to increase the mutual spatial distance, creepage distance, etc., and prevent breakdown of the withstand voltage.

In addition, since the concave portion that prevents breakdown of the withstand voltage is a slight concave hole formed in the yoke, the winding space of the coil core wire is reduced, and the magnetic path of the yoke is significantly narrowed to increase the magnetic resistance. Nothing.

Therefore, according to the present invention, it is possible to provide a coil block excellent in withstand voltage without reducing the magnetic force.

<< Embodiment >> An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an exploded perspective view showing a coil block according to the present invention, and FIG. 2 is a sectional view of the coil block shown in FIG.

In the figure, reference numeral 10 denotes a coil. The coil 10 has a coil core 13 wound around the outer circumference of a spool 11 having flanges 12 and 12 at both ends, and the outer circumference of the wound coil core 13 is used for insulation protection. It is configured by being covered with the coil tape 14.

Reference numeral 15 is an iron core, which is inserted into a hole 11a provided at the center of the spool 11 and the magnetic pole surface is excited by exciting the coil.

Reference numeral 16 is an L-shaped yoke, the bent portion of which is the magnetic pole surface 15.
The coils 10 are arranged close to each other and face each other along the coil 10 so as to be on the opposite side of a.

Further, the coil core wire 13 is provided on the coil facing surface of the yoke 16.
And a concave portion 17 is formed in the vicinity of the flange 12 in the vicinity of the maximum distance between the coil core wire 13 and the yoke 16, and the maximum proximity distance and creepage distance between the coil core wire 13 and the yoke 16 are eliminated. Has been increased to.

Since the present invention is configured as described above, even if the coil core wire 13 is not completely covered by the coil tape 14 in the vicinity of the flange 12 where the coil tape 14 is difficult to wind, the yoke 16 is The recess 17 provided can eliminate the maximum proximity between the coil core wire 13 and the yoke 16, increase the spatial distance and the creepage distance from each other, and prevent breakdown of the withstand voltage.

Further, since the concave portion 17 for preventing breakdown of the withstand voltage is a slight concave hole formed in the yoke 16, the winding space of the coil core wire 13 is reduced, or the magnetic path of the yoke 16 is significantly narrowed to reduce the magnetic resistance. There is no increase in

Therefore, according to the present invention, it is possible to provide a coil block excellent in withstand voltage without reducing the magnetic force.

FIG. 3 shows another embodiment according to the present invention, in which a concave hole formed in the yoke 16 is formed in a long linear groove 18 in the vertical direction. Withstand voltage can be further improved.

[Brief description of drawings]

1 is an exploded perspective view of a coil block according to the present invention, FIG. 2 is a sectional view of a coil block according to the present invention, FIG. 3 is a perspective view of a yoke showing another embodiment of the present invention, and FIG. 1A and 1B are a perspective view and a plan view showing a conventional coil block. 10 ... Coil 12 ... Flange 13 ... Coil core wire 14 ... Coil tape 16 ... Yoke 17 ... Recessed portion 18 ... Recessed groove

Claims (1)

[Scope of utility model registration request] 1. A coil core wire is wound around an outer periphery of a spool having flanges at both ends, and a coil is covered with a coil tape for insulation protection, and the coil core wire is provided along a winding direction of the coil. A coil block in which yokes are closely arranged to face each other, characterized in that a concave portion is formed on the coil facing surface of the above-mentioned yoke, at a position closest to the coil core wire, and near the flange. .