JPH0626855Y2 - Electronic electricity meter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electronic watt-hour meter having a battery for compensating for a power failure in a housing, and particularly to a means for preventing discharge and consumption of the battery.

[Conventional technology]

There is an electronic watt-hour meter equipped with a battery for power failure compensation, which is disclosed in Japanese Utility Model Publication No. 57-375. It was

That is, for example, during manufacture, factory shipment, certification, and use, the battery is in use even though the instrument is not used, so the battery is discharged and discharged.

As an example of the discharge consumption preventing means of the battery, the structure shown in FIGS. 6 to 8 can be considered.

In the drawing, (1) (2) (3) (4) are terminals, and terminals (1) (2)
Is connected to an AC power source and terminals (3) and (4) are connected to the load to be weighed. (11) is a power pulse train converter, the above terminals (1) (2)
Connected to (4) respectively. The terminals (2) and (3) are connected to each other in the housing of the instrument.

The output of the power pulse train converter (11) is connected to the count display circuit (9). The terminals (1) and (2) are further connected to the primary side of the power transformer (10), and the secondary side of the power transformer (10) is connected to the stabilized power supply device (14).

The output of the stabilized power supply (14) is the power pulse train converter (11).
Further, it is connected to the count display circuit (9) via the diode (15). The counting display circuit (9) further includes a switch (13) and a diode (16) on the cathode side of the diode (15).
The battery (12) is connected via.

FIGS. 7 and 8 specifically show the housing (outer peripheral portion) of the electronic watt-hour meter shown in FIG. In the drawing, (5) is a glass cover, which is sealed by being attached to the base (150) by the sealing screws (6a) and (6b). (8) is a terminal cover, and the above base (15
It is attached to the terminal box of (0) with the sealing screw (7) and is sealed during use.

The structure of these housings is almost similar to the structure of the base, cover, terminals, etc. shown in JIS C1210 "General rules for electricity meters" and JIS C1211 "Electric meters (independent meters)". The components such as the count display circuit (9), the power transformer (10), the power pulse train converter (11), the battery (12), and the switch (13) are housed in a housing as shown in the drawings as an example. .

In the watt-hour meter having the above-mentioned configuration, the battery (12) supplies power to the count display circuit (9) when there is no energization, and stores the measured value in memory. Further, the switch (13) was held (OFF) from manufacturing / factory shipment to the time of the verification, and was closed (ON) and sealed at the time of the verification.

[Problems to be solved by the invention]

In a conventional electronic watt-hour meter, a switch (13) may be provided as a means for preventing discharge / consumption of a battery for power failure compensation, as described in FIGS. 6 to 8.

This switch (13) is usually built in the glass cover (5) as shown in FIG. 8. Therefore, the glass cover (5) must be removed and the switch (13) must be closed at the time of verification. There was the annoyance that it wouldn't happen. At this time, if you forget to close and seal, the sealing screws (6a) (6b)
The glass cover (5) must be unsealed and the glass cover (5) removed. Furthermore, after closing the switch (13), distribution, storage,
There is a problem that the battery (12) is unnecessarily discharged and consumed in the process of installation and use.

This invention was made in order to solve the above problems, and eliminates the need to close the switch (13) during verification, and prevents unnecessary discharge of the battery (12) during installation and use. The purpose is to obtain an electronic watt hour meter that can be used.

[Means for solving problems]

In the electronic watt-hour meter according to the present invention, the housing of the meter is constructed so that the display device section and the base section can be separated from each other, and both of them are connected at the time of verification and use.

Therefore, the switch for preventing discharge of the battery is opened and closed by separating and connecting the display unit and the base unit.

[Action]

In this invention, when the display device section and the base section are combined, the switch for preventing battery drainage is automatically closed to prevent forgetting to close the switch, and the display section and the base section are separated. Then, open the switch to prevent the discharge of the battery.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. In the drawings, reference numerals (1) to (5), (6a), (6
b), (9) to (12) and (14) to (16) are the same as the constituent parts described in FIGS. 6 to 8. The main part of the embodiment will be described with reference to FIG. 2 and FIG.
A counting display circuit (9) is housed inside (5), and a switch (17) and plug terminals (7a) (7b) (7c) are provided on the back side to form a display unit (140). To do.

The switch (17) is a lead switch whose opening / closing is controlled by a permanent magnet or an electromagnet.

FIG. 4 and FIG. 5 show the base part (150) in which the terminals (1) to (4) and the like are housed, and the plug terminals (7a) (7b) ( The insertion receiving terminal corresponding to 7c) and the permanent magnet (18) facing the lead switch (17) are provided.

When the display unit (140) and the base unit (150) are combined, the external appearance is almost the same as that of the conventional instrument shown in FIG. 8 and FIG.

At the time of this coupling, the switch (1
7) is automatically closed, and the display unit (140) and base (15)
The switch (17) sets the relative position so that the switch (17) is automatically opened when the (0) is separated.

In the above embodiment, the lead switch is used as the switch (17), but the actuator using the micro switch has the display device section (140) and the base section (15).
It may be configured such that the switch (17) is closed by abutting on the base portion (150) when the 0) is coupled.

According to the electronic watt-hour meter configured as described above, even when the display unit (140) is sealed, the base unit (15
If separated from 0), switch (17) is opened. At the time of installation and use, the switch (17) is automatically closed by connecting the display unit (140) and the base unit (150).

As described above, according to the present invention, the switch (1) can be formed only by connecting the display unit (140) and the base (150).
Since 7) is configured to be automatically closed, it is possible to save the labor of removing the glass cover (5) and closing the switch at the time of verification. Also, never forget to close the switch.

It should be noted that by separating the display unit (140) and the base unit (150) from factory shipment to installation and use,
During this time, unnecessary discharge of the battery is prevented from being consumed, so that a practical effect is large, such as the use of a small and inexpensive battery.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention. FIG. 1 is a block diagram showing a circuit configuration, FIG. 2 is a side view of a display device portion, and FIG. 3 is a rear surface of the display device portion. FIG. 4 is a front view of the base portion, and FIG. 5 is a side view of the base portion. 6 to 8 are conventional electronic watt-hour meters, FIG. 6 is a block diagram showing the circuit configuration, FIG. 7 is a front view, and FIG. 8 is a side view. In the figure, (1) to (4) are terminal devices, (5) is a glass cover, (9) is a count display circuit, (11) is a power pulse train conversion circuit, (12) is a power failure compensation battery, (14) Is a power supply circuit, (17) is a switch, (140) is a display device section, and (150) is a base section. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A power pulse train conversion circuit for converting the voltage / current of a circuit under test into a multiplied pulse train, a count display circuit for counting and displaying the pulses from the power pulse train conversion circuit, and a DC voltage obtained from the voltage of the circuit under test. A power supply circuit that supplies a DC voltage to the power pulse train conversion circuit and the count display circuit, and a power failure that is connected to the count display circuit together with the power supply circuit and supplies a DC voltage to the count display circuit when the circuit under test fails. Compensation battery, a terminal device for connecting to the circuit to be measured, a display device unit for accommodating a counting display circuit, etc. of the constituent parts, and a base unit for accommodating the internal terminal device of the constituent parts, In a configuration in which the display device unit and the base unit are combined, a switch that closes when the display device unit and the base unit are connected and that opens when separated is placed above. Electronic electricity meter, characterized in that incorporated in the circuit of the power failure compensation cell.