JPS6042377Y2 - Light load adjustment device for electricity meter - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a light load adjustment device for a power meter.

In general, in electricity meters, the light load adjustment device compensates for negative errors caused by frictional torque at light loads. A short-circuited metal ring or piece of iron is placed under the voltage magnetic pole, and the device is moved to compensate for the compensation torque caused by the moving magnetic field. It is desired that the adjustment device has a simple structure and is easy to adjust.

Figure 1 shows a conventional embodiment in which a light load adjustment piece is placed under the voltage magnetic pole and moved, and Figure 1a is a side view of the main part of the light load adjustment device. FIG.

In the figure, 10 is a voltage element, which is equipped with a voltage core 11 and a voltage coil 12, and a light load adjustment piece 15 is attached with a rivet 14 to the tip of a counter electrode yoke 13 that is attached opposite to the voltage core 11. There is.

The rotating disk 16 has a shaft 16a supported by a bearing (not shown), and rotates within the gap formed between the voltage iron core 11 and the counter electrode yoke 13, and the light load adjusting piece 15 can be adjusted by applying force from the outside. It is designed to be able to rotate in parallel with the rotating disk 16 in the direction of arrow 17 using the rivet 14 as a fulcrum.

In the above configuration, the adjustment is made by moving the light load adjustment piece 15 in either direction of the arrow 17 to bias a part of the voltage effective magnetic flux.Although the configuration is simple, it is best to adjust from the front of the meter. In this case, since the shaft 16a of the rotating disk 16 gets in the way, an adjustment jig is required, making adjustment difficult.

FIG. 2 shows a conventional embodiment in which a shade ring is placed under the voltage magnetic pole and moved. FIG. 2a is a front view of the main part of the light load adjusting device, and FIG. 2 is a plan view thereof.

In the figure, the same components as shown in FIG. 1 are given the same reference numerals, and their explanation will be omitted.

Voltage core 1 facing rotating disk 16 in voltage element 10
A shading ring 21 is provided on the first surface with a mounting member 22 interposed therebetween.

This shade ring 21 is moved on the surface of the voltage core 11 in the direction of arrow 24 via an adjustment screw 23, and set at a predetermined position using a set screw 25.

In the above configuration, the adjustment is made by moving the shade ring 21 in either direction of the arrow 24 to bias a part of the voltage effective magnetic flux.This method improves workability because adjustment can be done from the front of the instrument, but This method has the disadvantage of high cost due to the increase in the number of points.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and provide a low-cost, easy-to-adjust light-load adjustment device for a power meter.

Embodiments of the present invention are shown in FIGS. 3 and 4, and FIG.
1 is a side view of the main part of the light load adjustment device, FIG. 3 is a front view thereof, FIG. , FIG. 4C is a side view thereof.

In the figures, the same components as those shown in FIGS. 1 and 2 are designated by the same reference numerals, and their explanations will be omitted.

A counter electrode yoke 13 is attached opposite the voltage iron core 11 in the voltage element 10, and a light load adjustment piece 31 is attached with a rivet 32 at the tip of the counter electrode yoke 13, facing the voltage iron core 11.
It is attached by.

The rotating disk 16 has a shaft 16a supported by a bearing (not shown), and rotates within a gap formed between the voltage iron core 11 and the counter electrode yoke 13.

As shown in FIG. 4, the light load adjustment piece 31 has a rivet hole 41 in the center and is bent, and both ends 42 protrude by an amount corresponding to the plate thickness of the counter electrode yoke 13, so that the voltage of the counter electrode yoke 13 is adjusted. It is arranged to be formed substantially on the same line as the surface 13a facing the iron core 11.

Also, one end 42 has a bent portion 43 bent at a right angle.
A square hole 44 is provided in this bent portion.

By inserting a toy bar or the like into this square hole 44 and rotating it, the light load adjusting piece 31 can be moved in the direction of the arrow 33 using the rivet 32 as a fulcrum.

In the above configuration, the light load adjustment piece 31 is moved from the riveted portion 34 by moving the light load adjustment piece 31 in either direction of the arrow 33 to bias and adjust a part of the voltage effective magnetic flux. By forming two bent sides, adjustment can be easily made from the front of the instrument without being obstructed by the shaft 16a of the rotating disk 16, and the synergistic effect of the two sides expands the adjustment range, making it possible to The adjustment jig can be adjusted by moving it.

As described above, in the present invention, two bent sides are formed at the tip of the counter electrode yoke attached opposite to the voltage core of the voltage element, and a bent part is formed at one end. The light load adjustment piece with a square hole is riveted to the bent part, and the square hole is used to move the light load adjustment piece, so the structure is cost-effective and it can be easily installed with a screwdriver from the front of the instrument. Since the adjustment work can be easily performed using the above method, it is possible to provide a light load adjustment device for a power meter with good workability.

[Brief explanation of drawings]

Figure 1 shows a conventional embodiment in which a light load adjustment piece is placed under the voltage magnetic pole and moved. Figure 1a is a side view of the main part of the light load adjustment device. The plan view and FIG. 2 show a conventional embodiment in which a shade ring is placed under the voltage magnetic pole and is moved, and FIG. 2a is a front view of the main part of the light load adjustment device, and FIG. The plan view, FIGS. 3 and 4 show an embodiment of the present invention, FIG. Figure C is a plan view of Figure 3a, Figure 4a is a plane view of the light load adjustment piece, and Figure 4A is a plan view of Figure 4A.
Figure a is a front view, and Figure 4C is a side view of Figure 4. 10... Voltage element, 11... Voltage iron core, 12... Voltage coil, 13... Counter electrode yoke, 31... Light Load adjustment piece, 34...
...Tacked part, 42...Both ends of light load adjustment piece,
43...Bending portion of light load adjustment piece, 44...
...Square hole at the bend.

Claims (1)

[Scope of utility model registration request] a voltage element including a voltage iron core and a voltage coil; a counter electrode yoke provided opposite to the voltage iron core while sandwiching the rotor of the watthour meter; and a counter electrode yoke provided at the tip of the counter electrode yoke opposite to the voltage iron core. a light load adjustment piece riveted thereto, the light load adjustment piece is formed by two sides bent from the riveted portion to the opposite side of the counter electrode yoke, and both ends of the light load adjustment piece are provided. It is characterized by having a part protruding toward the voltage core side 1, forming a bent part at one end thereof bent at a substantially right angle to the side opposite to the protruding side, and providing a hole in the bent part. Light load adjustment device for electricity meter.