JPS6122290Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in a phase adjustment device installed in an electric meter such as an inductive watt-hour meter to perform accurate measurement, and in particular to This invention relates to an improvement of a storage body for storing a variable low drag wire connected to a wire ring.

Generally, in an inductive watt-hour meter, the phase difference angle (referred to as internal phase angle) between the voltage magnetic flux generated by the voltage coil and the applied voltage must be 90 degrees. However, the voltage magnetic flux generated by the voltage coil lags behind the normal applied voltage by about 80° to 85° because the voltage electromagnet is not a complete induction circuit. For this reason, inductive watt-hour meters are equipped with a phase adjustment device to adjust the internal phase angle to nearly 90°, as is well known.

FIGS. 1 to 4 are diagrams showing conventional phase adjustment devices of this kind. First, the conventional phase adjustment devices will be explained with reference to these figures.

The voltage electromagnet 1 has an E-type laminated voltage core 2, and a voltage coil 4 is wound around the central leg 3 of the core 2 with an appropriate wire diameter and number of turns, and a circuit voltage is applied to the voltage coil 4. It is becoming more and more common.
Further, a shorting coil 5 is wound around the lower end of the central leg 3.

On the other hand, the resistance wire shorting device 6 has a support frame 7 fixed at an appropriate position by means such as screw tightening. The upper end of an inverted U-shaped resistance wire 9 is inserted and supported in the upper end. Further, the lower end of this resistance wire 9 is connected to the support holes 11 and 11 of the insulating plate 10.
The insulating plate 10 is fixed to the support frame 7 by caulking or the like, so that the support frame 7
is supported by Both ends 12, 12 of the resistance wire 9 and the shorting wire ring 5 are connected to the insulating tube 1.
The lead wire portion 1 of the short-circuit wire ring 5 covered by 3
Connected by 4.

Further, inside the support frame 7, a pair of V grooves 16, 16 with which the resistance wire 9 can be engaged, and this V groove 16 are provided.
A slide piece 15 is provided with a screw hole 18 drilled in a surface 17 formed with a flat washer 1 in the screw hole 18.
By screwing the fixing screw 20 through the washer 19, the resistance wire 9 is held between the washer 19 and fixed at an arbitrary height.

Note that a current electromagnet (not shown) is arranged opposite to the voltage electromagnet 1, and a rotating disk (not shown) rotates and passes through a gap between the voltage electromagnet 1 and the current electromagnet with appropriate dimensions. It's becoming like that. According to the above-described configuration, when the circuit voltage is applied to the voltage coil 4, the short-circuit coil 5 is short-circuited with a non-inductive low resistance, so that the relationship with the voltage coil 4 is similar to that of the secondary winding of the transformer. The effect is similar to that of a wire, and an electromotive force is generated at the short-circuit wire ring 5 with a delay of 180° from the applied voltage. Then, a magnetic flux is generated in the same phase as this current through this current, and the vector composite magnetic flux of this magnetic flux and a magnetic flux whose phase is delayed by about 80° to 85° from the circuit voltage generated by the voltage coil 4 actually passes through the disk. The magnetic flux is This vector resultant magnetic flux can be further delayed than the magnetic flux generated only by the voltage coil 4, and by appropriately selecting the number of turns of the short-circuit wire 5 and the resistance value of the resistance wire 9, the vector resultant magnetic flux can be delayed further than the magnetic flux generated only by the voltage coil 4. It is adjusted so that it is delayed by just 90 degrees. Generally, this adjustment is performed by keeping the number of turns of the wire ring 5 constant, loosening the fixing screw 20 at the short-circuit position of the resistance wire 9, and moving the slide piece 15 in the direction of the arrow in Fig. 2 to adjust the resistance value. This is done by changing the

By the way, FIG. 5 shows a graph of the relationship between the moving distance l of the resistance wire shorting device 6 shown in FIG. 2 and the error (%) of the inductive watt-hour meter, and as is clear from this graph, The small range of l, that is, the _l1 part near the connection between the lead wire part 14 of the short-circuit wire ring 5 and the resistance wire 9, is the part where the adjustment effect where the error changes greatly for a small moving distance is large. be. However, this l ₁ part in Figure 2 is
This is a part that does not contribute to the actual adjustment work. This is because the error (ε) of the watt-hour meter changes according to the relational expression shown below.

ε=K.tan

In the conventional device described above, the resistance wire 9 is inserted into the insertion holes 11, 11 of the insulating plate 10, and the shorting wire ring 5 is
Since the vicinity of the connection between the resistor wire 9 and the resistance wire 9 cannot be used as an effective short-circuit point, the adjustment range becomes narrow and adjustment work is difficult.

Further, in order to hold the resistance wire 9 on the insulating plate 10, both ends 1 of the resistance wire are inserted into the support holes 11, 11 of the insulating plate.
2 and 12, respectively, and the insulating plate 10 must be mounted almost perpendicularly to the support base 7, resulting in complications in the production process.

The present invention has been developed in view of the above points, and by integrally molding the storage body for storing the resistance wire from thermoplastic resin, it simplifies the installation of the resistance wire, and also simplifies the installation of the resistance wire. The permissible range of phase adjustment is expanded by locating the connecting portion between the wire ring and the resistance wire in the thick part of one end wall of the storage body.

The present invention will be explained below with reference to embodiments shown in the drawings. The configuration of the voltage electromagnet 1 described above is the same in the present invention and is therefore not shown in the drawings, and the same configurations as those of the prior art described above are designated by the same reference numerals in the drawings, and their explanations will be omitted.

6 to 8 show a first embodiment of the present invention, in which the support frame 21 of the resistance wire shorting device 6, which forms part of the phase adjustment device, is made of plastic such as Duuracon, for example. This support frame 21 has a rectangular box shape, as shown in detail in FIG. It is adapted to be fixed in position.
Further, a pair of grooves 26 , 26 into which the resistance wire 9 is fitted are formed in the upper wall 25 , and a wide groove 28 is formed in the lower wall 27 .
A protrusion 29 is erected at the center of the holder. In addition,
The length of the support frame 21 is such that when the resistance wire 9 is attached to the support frame 21, both lower ends of the resistance wire 9 are in grooves 28.
It has been selected to be located within the

Therefore, as shown in FIG. 6, the upper end of the inverted U-shaped resistance wire 9 is fitted into the grooves 26, 26 of the support frame 21, and the resistance wire 9 located in the groove 28 at this time is Lead wire portion 1 of short-circuit wire ring 5 at both lower ends
Connect 4. In addition, a flat washer 1 is attached to the resistance wire 9.
9 and the fixing screw 20 are fixed by a slide piece (not shown).

Then, the head of the protrusion 29 is crushed by heat caulking or other means as shown in FIG.
and the connecting portion of the resistance wire 9 is directly fixed to the support frame 21.

According to the above-mentioned structure, since the support frame 21 is integrally molded, it can be processed very easily, and the attachment of the resistance wire 9, especially the connection of both ends 12, 12 and the short-circuit wire ring 5, and the connection of the support frame 21 are extremely easy. Fixation to the grooves 28, 28 is easily achieved. Since the slide piece (not shown) can be positioned close to the connection between the shorting wire 5 and the resistance wire 9, the resistance value can be controlled over a wide range, and the delay of the vector composite magnetic flux with respect to the applied voltage can be reduced to 90 degrees. Adjustment is extremely easy.

9 and 10 show another embodiment of the present invention, in which the grooves 26, 26 in the upper wall 25 and the lower wall 27 of the support frame 21 in the embodiment described above are shown.
28 is replaced with a pair of grooves 30, 30, respectively. These grooves 30, 30 are relatively deep grooves that are narrower than the connecting portion of the short-circuit wire ring 5 and the resistance wire 9, and enlarged portions 31, 31 having approximately the same diameter as the corresponding connecting portion are formed at the intermediate position. ing.

Therefore, the connecting portions of the shorting wire ring 5 and the resistance wire 9 are connected to these grooves 30, 30.
Since the connecting portion is fixed in the enlarged portions 31, 31 by press-fitting into the 0, no special work such as caulking is required.

As explained above, in the phase adjustment device according to the present invention, in particular, the insulating part that supports the resistance wire connected to the shorting wire and the support frame that houses and holds the resistance wire are integrated into a housing body using thermoplastic resin. The process is extremely simple because the short-circuit wire rings and the resistance wires are press-fitted into the thick part of the end wall of the storage body, which is an insulating material. It is easy to install in the storage body, and insulation between the resistance wires can be easily achieved.
These production and assembly operations are greatly simplified. Furthermore, since the connecting portion between these short-circuit wire rings and the resistance wire is located in the thick part of the end wall of the housing, the variable range of the resistance value of the resistance wire is expanded, and a suitable phase adjustment function is obtained.

[Brief explanation of the drawing]

Figures 1 to 4 show a conventional phase adjustment device, with Figure 1 being a front view, Figure 2 being a side view, Figure 3 being a bottom view of Figure 2, and Figure 4 being a bottom view of Figure 4. FIG. 5 is a graph showing the relationship between the moving distance and error of the resistance wire shorting device, and FIGS. 6 to 8 are the first phase adjustment device according to the present invention.
Fig. 6 is a front view and Fig. 7 is a front view showing an embodiment.
The figure is a sectional view showing a state in which the connection part is fixed to the resistance wire support base, Figure 8 is a perspective view of the resistance wire support base, and Figures 9 and 10 are a second embodiment of the position adjustment device according to the present invention. FIG. 9 is a front view, and FIG. 10 is a sectional view taken along line X--X in FIG. 9. 1... Voltage electromagnet, 5... Shorting wire ring, 6... Resistance wire shorting device, 7, 21... Support frame, 9... Resistance wire, 15... Slide piece, 20... Fixing screw, 2
6, 28, 30...groove.

Claims (1)

[Scope of utility model registration request] A voltage coil and a short-circuit wire wound around the center of the laminated voltage core are connected to both ends of the short-circuit wire, and by changing the resistance value, the voltage magnetic flux generated by the voltage coil is vector-wise adjusted to a predetermined value. In a phase adjustment device comprising a resistance wire bent into a U-shape to be combined so as to be in phase, and a storage body comprising an insulating part that supports the resistance wire and a support frame that houses and holds the resistance wire. , the storage body is integrally formed as a box body with an open front face made of thermoplastic resin, and the resistance wire is fitted and supported in each pair of support grooves formed on opposite end walls of the storage body, and A phase adjusting device characterized in that a connecting portion to a short-circuit wire inserted through each of the supporting grooves is crimped and fixed by pressing a protrusion formed between the supporting grooves on one end wall of the phase adjusting device.