JP2003028903A - Electronic watt-hour meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiring breaker type electronic watt-hour meter, having a low priced (reduction in man-hours and in material cost) and reliable connection structure that can easily connect to a terminal and a common voltage circuit, without enlarging instrument dimensions. SOLUTION: The electronic watt-hour meter 1 comprises the terminal parts of a power source sides 21aS, 21bS, 21cS connected to a power source, the terminal parts of a load side 21aL, 21bL, 21cL connected to a load, an instrument current wire connecting the terminal part of the power source side 21aS and the terminal part of the load side 21aL, and a voltage wire 35a connecting either of the terminal parts, in which the voltage wire 35a mounted on a printed wiring board 52, where an electronic circuit is installed, is sandwiched between the instrument current wire 30a and a terminal nut 16 provided on the terminal part 21aS, to be fixed there.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an electronic watt hour meter, and more particularly to a voltage circuit connecting terminal structure of the electronic watt hour meter.

[0002]

2. Description of the Related Art The structure and connection structure of a conventional watt hour meter will be described with reference to FIGS. FIG. 5 is a front view of the watt-hour meter, which is partially cut away, and FIG. 6 is a connection diagram for explaining the connection state. Electricity meters need to measure current and voltage.

As shown in FIGS. 5 and 6, the watt hour meter is connected to an electronic circuit 51 included in the watt hour meter main body 50, power source side terminals 21aS, 21bS and 21cS connected to a power source, and a load. Load side terminals 21aL, 21bL, 21c
L, meter current lines 30bS, 30cS connecting between the power supply side terminals 21bS, 21cS and the electronic circuit 51, and meter current lines 30bL, 30cL connecting between the load side terminals 21bL, 21cL and the electronic circuit 51, and electronic The voltage line 35a connecting between the circuit 51 and the meter current line 30a, the voltage lines 35b and 35c connected to the electronic circuit 51, and the voltage line 3
Test terminals 37b and 37c to which 5b and 35c are connected
And the power supply side terminals 21bS and 21cS and the test terminal 37
b, 37c connection line 36 for detachably connecting
b and 36c.

By fastening the voltage line 35a to the terminal block connected to the load side terminal 21aL of the instrument current line 30a with a screw, the electronic circuit 51 and the terminals 21aS, 21aL are connected.

The connection lines 36b and 36c for detachably connecting the power source side terminals 21bS and 21cS and the test terminals 37b and 37c are configured to be slidable and slid to the power source side terminals 21bS and 21cS. After making contact with each other, they were fastened and connected by screws.

Even if the connection between the voltage line 35a and the meter current line 30a has such a structure, the watt-hour meter shown in FIG. 5 is large in size because the equipment itself is large. It didn't matter.

[0007] On the other hand, miniaturization of the watt hour meter is also urgently needed because it is necessary to measure the electric power energy finely as a part of the energy management method as one of the global environmental problems. There is a physical limit to mounting a large number of watt hour meters having a conventional configuration for managing this on an existing distribution board or mechanical equipment. For this reason, there is an increasing demand for miniaturization of the watt-hour meter itself, and there is an urgent need to meet the demand.

As one of the measures for realizing the miniaturization, there is, for example, an electronic watt-hour meter in the shape of a circuit breaker for wiring as shown in FIG.

Since this type of watt-hour meter is small, connecting a common voltage lead wire and a voltage terminal with terminal screws as in the prior art leads to an increase in the size of the meter and a small working space. Workability is poor and cost increases.

[0010]

SUMMARY OF THE INVENTION Therefore, according to the present invention, it is possible to easily connect a terminal and a voltage circuit provided in an electronic circuit without increasing the size of the instrument, and at a low cost (reduction of man-hours and material cost), reliable. It is an object of the present invention to provide a circuit breaker type electronic watt-hour meter having a flexible connection structure.

[0011]

According to the present invention, the common voltage circuit of an electronic watt-hour meter and the external connection terminal are directly connected to the common voltage circuit instead of the conventional connection method using a lead wire. The circuit member is sandwiched and fixed.

That is, according to the present invention, a power source side terminal portion connected to a power source, a load side terminal portion connected to a load, and a meter current line connecting the power source side terminal portion and the load side terminal portion. In an electronic watt-hour meter having a voltage line connected to any of the terminal parts, the voltage line mounted on a printed wiring board having an electronic circuit mounted thereon is provided with the meter current line and the terminal part. It was put between nuts and fixed.

The present invention provides the above electronic watt hour meter,
The meter current line passes under the printed wiring board to connect the power source side terminal portion and the load side terminal portion. Furthermore, the present invention provides the above electronic watt hour meter,
An opening was provided through which the voltage line was inserted into the instrument current line.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a circuit breaker type electronic watt-hour meter for wiring which employs a voltage circuit connection structure according to the present invention will be described below with reference to FIGS.

FIG. 1 is a front view schematically showing the exterior structure of a circuit breaker type electronic watt-hour meter, FIG. 2 is a side sectional view taken along the line II-II of FIG. 1, and FIG. FIG. 4 is a connection diagram of this watt-hour meter.

First, the connection configuration of the electronic watt hour meter 1 will be described with reference to FIG. The electronic watthour meter 1 includes an electronic watthour meter main body 50 including an watthour meter electronic circuit 51, and a main body 50.
20 S of power supply side terminal parts and 20 L of load side terminals provided in
Is configured. The power supply side terminal portion 20S is provided with three power supply side terminals 21aS, 21bS, 21cS, and the load side terminal portion 20L is provided with three load side terminals 21aL, 21c.
bL and 21 cL are provided.

Power supply side terminal 21aS and load side terminal 21aL
The two are directly connected by a meter current line 30a. Power supply side terminal 2
1bS and the electronic circuit 51 are connected by a meter current line 30bS, and the load side terminal 21bL and the electronic circuit 51 are connected by a meter current line 30bL. An instrument current line 30cS is provided between the power supply side terminal 21cS and the electronic circuit 51, and the load side terminal 21cL and the electronic circuit 5 are connected.
1 is connected by a meter current line 30 cL.

Further, the power supply side terminal 21aS and the electronic circuit 51
The lines are connected by a voltage line 35a. The connection line 36 is provided between the power supply side terminal 21bS and the electronic circuit 51 via the test terminal 37b.
b and the voltage line 35b. Power supply side terminal 21c
The S and the electronic circuit 51 are connected by a connection line 36c and a voltage line 35c via a test terminal 37c.

At the time of testing / verification of the electronic watt-hour meter 1, the power supply side terminals 21bS, 21c by the connecting lines 36b, 36c.
The connection between S and the test terminals 37b and 37c is opened, and the test voltage is applied to the electronic circuit 51 from the test terminals 37b and 37c.

The structure of the electronic watt-hour meter 1 will be described with reference to FIGS. This electronic watt hour meter 1 has an electronic circuit 51.
It is configured to have a container 10 having a space for housing the electronic watt-hour meter main body 50 including, and a lid 40 that covers the opening of the container 10.

The container 10 is formed as a box for accommodating the main body 50, and a power source side connecting portion 20S to which power source side and load side electric wires are connected to the upper and lower surfaces around the opening.
And the load side connection portion 20L are provided so as to face each other as shown in the drawing.

In the connecting portion 20 provided in the container 10, the terminal recess 11 in which the terminal portion 31 of the meter current wire 30 is arranged,
An insertion hole 12 into which an external wire connecting terminal nut 16 is inserted, a terminal partition wall 13 provided on both sides of the terminal recess 11 and an instrument mounting screw hole 15 provided in one terminal partition wall are provided. It is formed.

Power supply side terminal 21aS and load side terminal 21aL
The voltage line notch 14 in which the voltage line 35a is arranged is provided in the terminal insertion concave portion 11aS of the power supply side connection portion 20S into which the terminal portion 31aS of the meter current line 30a connecting to and is inserted.

The lid portion 40 protects the surface of the electronic watt-hour meter main body 50 fixed to the container 10. On the surface thereof, there is a measured value display portion 41 for displaying the measured amount of electric power, and an operating state. Is provided, and a measurement pulse transmission unit 43 for displaying a measurement pulse by a light emitting diode or the like.

As shown in FIG. 3, the meter current wire 30a is formed by bending both ends of a long and narrow plate-shaped conductor to form a rising portion, and further bending the tip end thereof outward to form the terminal portion 3.
1aS and 31aL are formed, and the terminal portion 31a
A screw hole 32 is formed in S, 31aL, and an opening 33 through which the voltage line 35a is inserted is formed at a location where the rising portion is bent.

The electronic circuit 51 is mounted on the printed wiring board 52, and one end of the voltage line 35a is fixed to the common voltage circuit by soldering, for example.

When assembling the meter, the terminal nut 16 is inserted into the insertion hole 12a, and the other end of the voltage line 35a is passed through the opening 33 of the meter current line 30a.
The terminal portions 31a at both ends of a are mounted in the terminal recess 11S.

As a result, the other end of the voltage line 35a is
As shown in FIG.
It is sandwiched between the back surface of 1aS and the upper surface of the terminal nut 16.

Next, the external electric wire connecting terminal screw 17 is screwed and fixed to the terminal nut 16 via the flat washer 18 and the spring washer 19.

Thus, the power source side terminal portions 21aS, 21bS, 21cS connected to the power source, the load side terminal portions 21aL, 21bL, 21cL connected to the load, the power source side terminal portion 21aS and the load side. In an electronic watt hour meter having a meter current line 30a connecting to the terminal portion 21aL and a voltage line 35a connected to one of the terminal portions, the meter current line 30a has an opening 33 through which the voltage line 35a is inserted. And a printed wiring board 52 having an electronic circuit
Of the power supply side terminal portion 21aS and the load side terminal portion 21aL, and the voltage line 35a mounted on the printed wiring board 52 is provided on the meter current line 30a and the terminal portion. It is possible to obtain a connection structure that is sandwiched and fixed between the nuts 16.

Since the other end of the voltage wire 35a is thus sandwiched between the lower surface of the terminal portion 31a of the meter current wire 30a and the upper surface of the terminal nut 16 inserted into the terminal nut insertion hole 12, Even if the external wire connecting terminal screw 17 is tightened, the rotational force is not transmitted to the other end of the voltage wire 35a, and the other end portion of the voltage wire 35a is unlikely to be damaged during tightening.

The other end of the voltage line 35a is connected to the meter current line 30.
It is not preferable to be sandwiched between the upper surface of the terminal 31aS of a and the lower surface of the flat washer 18 because it will be damaged when tightened by the external electric wire connecting terminal screw 17.

[0033]

According to the present invention, when one end of the voltage line 35a mounted on the printed wiring board 52 on which the electronic circuit 51 is mounted is incorporated into the meter, the opening 33 of the meter current line 30a is passed through,
Since it is only sandwiched between the terminal portion 31aS of the meter current wire 30aS and the terminal nut 16 of the external electric wire connecting terminal,
Workability is good without increasing the size of the instrument.

Also, in actual use or testing, if an external electric wire with a crimp terminal is sandwiched between the external terminal of the instrument current wire 30 and a washer and fastened with a terminal screw for connecting an external electric wire, the external electric wire and the instrument current wire are connected. 30 and the voltage line 35a can be reliably connected.

[Brief description of drawings]

FIG. 1 is a front view schematically showing the external structure of a circuit breaker type electronic watt-hour meter for wiring according to an embodiment of the present invention.

FIG. 2 is a side sectional view of the electronic watt-hour meter cut along the line II-II in FIG.

FIG. 3 is an exploded perspective view of essential parts for explaining a terminal structure of the electronic watt hour meter of FIG.

FIG. 4 is a connection diagram of the electronic watt-hour meter of FIG.

FIG. 5 is a front view schematically showing an external structure of a conventional electronic watt-hour meter.

FIG. 6 is a connection diagram of the electronic watt hour meter of FIG.

[Explanation of symbols] 1 Circuit breaker type electronic watt hour meter 10 Main body container 11 Terminal recess 12 External wire connection terminal nut insertion hole 13-terminal bulkhead 14 Notch for voltage line 15 Instrument mounting screw holes 17 Terminal screw for external wire connection 16 Terminal nut for external wire connection 18 flat washers 19 spring washer 20 terminals 30 Current line for instrument 31 Meter current wire terminal 32 screw holes 33 opening 35 voltage line 40 Lid 41 Weighing value display 42 Operation display 43 Measuring pulse transmitter 51 electronic circuits 52 Printed wiring board

Continued front page    (72) Inventor Hisaaki Kataoka             5-9-24 Negishidai, Asaka City, Saitama Prefecture (72) Strict cultivation of the inventor             2-8-16 Nishi Mizuhodai, Fujimi City, Saitama Prefecture

Claims (3)

[Claims] 1. A power source side terminal portion connected to a power source, a load side terminal portion connected to a load, and a meter current line connecting the power source side terminal portion and the load side terminal portion. In an electronic watt-hour meter having a voltage line connected to a terminal portion, the voltage line mounted on a printed wiring board having an electronic circuit mounted between the meter current line and a terminal nut provided in the terminal portion. An electronic watt hour meter characterized by being pinched and fixed. 2. The electronic watt hour meter according to claim 1, wherein the meter current line passes under the printed wiring board to connect the power source side terminal portion and the load side terminal portion. . 3. The electronic watt hour meter according to claim 2, wherein the meter current line is provided with an opening through which the voltage line is inserted.