JPH0418270B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in the terminal structure of a watt-hour meter in which the watt-hour meter is attached using a socket terminal method.

[Technical background of the invention]

FIG. 8 is an overall configuration diagram of the terminal structure of a conventional watt-hour meter. In the figure, reference numeral 1 denotes a power meter main body, which is configured to be detachable from a socket terminal box 4 to which power supply side electric wires 2a, 2b and load side electric wires 3a, 3b are connected. In addition,
When the watt-hour meter 1 is installed, power is supplied from the power supply side electric wires 2a, 2b to the load-side electric wires 3a, 3b through the measuring elements, that is, the voltage coil 5 and the current coil 6 provided inside the watthour meter main body 1. Moreover, when the watt-hour meter main body 1 is removed, the power supply side electric wires 2a, 2b and the load side electric wires 3a, 3b are directly connected through the side paths 7a, 7b, so that there is no power outage on the load side.

By the way, the concrete attachment means is a socket terminal. In other words, the board 8 of the power meter main body 1 has a blade-like terminal 9 constituting a socket terminal.
a, 9b, 9c, and 9d are provided, and a voltage coil 5 and a current coil 6 are connected to these blade-shaped terminals 9a to 9d. On the other hand, in the socket terminal box 4,
A blade receiving terminal 10a, which also constitutes a socket terminal,
10b, 10c, 10d are blade-shaped terminals 9a, 9b,
They are provided at positions opposite to 9c and 9d, respectively. These blade-shaped terminals 9a to 9d and blade receiving terminals 10a to 10d will be explained using 9a and 10d with reference to FIG. It is provided. Then, the fixed end 12 of the blade holder 12
The contact plate 13 contacts b, and this connection plate 13
and the free end 12a of the blade receiver 12 are configured to interlock with each other via an insulator 14. Therefore, the insulator 14 passes through the fixed end 12a of the blade receiver 12. In Fig. 9a, the contact plate 1 is attached to the blade holder 12.
3 are in contact with each other, so the power supply side electric wire and the load side electric wire are directly connected. Therefore, when the blade portion 9h of the blade terminal 9a is inserted between the double-edged receivers 11 and 12, the free end 12a of the blade receiver 12 moves to the right in the drawing, as shown in FIG. 9b. Accordingly, the contact plate 13 is pushed and moved in the direction opposite to the blade receiver 12. In this way, the blade receiver 12 and the contact plate 13 are separated, and the power supply side electric wire and the load side electric wire are separated.

[Problems with background technology]

However, in the above structure, the contact plate 13 moves in the opposite direction to the blade holder 12, so foreign matter may become caught between them, or the contact surface may corrode, increasing contact resistance and causing burnout accidents. There is a risk of it happening.

[Purpose of the invention]

The present invention was made based on the above circumstances, and
The purpose of this is to provide a cleaning action to prevent foreign objects from getting caught in the terminal, prevent corrosion, eliminate contact resistance increase, and enable uninterrupted power meter terminals with a simple configuration. It's about providing structure.

[Summary of the invention]

In order to achieve the above object, the present invention includes a socket terminal box having first and second current paths independently formed therein, and a socket terminal box disposed at a distance from each other on the bottom surface of the socket terminal box. Each band-shaped conductor is bent into an L-shape, and one end of the conductor is approximately U-shaped.
It has two blade holders curved in a letter shape, and has a contact part where the curved ends of the double-edged holders are brought into contact with each other,
A plurality of blade receiving terminals each electrically connected in series to the first and second current paths, and a plurality of blade receiving terminals each penetrated and fixed at a position corresponding to each of the blade receiving terminals on an insulating substrate that can be stored in the socket terminal box. a plurality of blade-shaped terminals each having one end thereof connected to a current coil and a voltage coil of the watt-hour meter, and the other end each of which can be slidably inserted into and slidably removed from the contact portion of the blade-receiving terminal. , is provided in a first current path of the socket terminal box, and when each of the blade terminals is slidably inserted into each of the blade receiving terminals, the first current path is opened and the second current path is opened. A member to which a current coil and a voltage coil of the watt-hour meter are electrically connected to the path, and the first current path is closed when each of the blade-shaped terminals is slid and removed from each of the blade-receiving terminals. It is equipped with the following.

[Embodiments of the invention]

A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram of the terminal structure of the watt-hour meter. In the figure, 20 is a power meter main body,
A substrate 23 to which a voltage coil 21 and a current coil 22 as measurement elements are connected is provided inside the wattmeter main body 20. Now, this board 23
There are blade-shaped terminals 24a, 2 constituting the socket terminal.
4b, 24c, and 24d are arranged at predetermined intervals. Further, an insulator protrusion 2 is provided at an intermediate position between the blade-shaped terminals 24a and 24c of this board 23.
5 is formed.

On the other hand, 30 is a socket terminal box, and the power supply side electric wires 2a, 2b and the load side electric wire 3 are attached to the bottom of the box.
a and 3b are connected by wiring. In this case, the power supply side electric wire 2b, the load side electric wire 3b, and the blade receiving terminals 31a, 33, and 31c, which will be described later, constitute a first current path, and the power source side electric wire 2a, the load side electric wire 3a, and the blade receiving terminals, which will be described later. 31b and 31d constitute a second current path. Now, on the inside bottom surface of this socket terminal box 30, there are the other blade receiving terminals 31a, 31b, 31c, which constitute the socket terminal.
31d are blade-shaped terminals 24a, 24b, 2, respectively.
It is provided at a position facing 4c and 24d.
Further, on the inner bottom surface of this socket terminal box 30, a side path 32 between the blade receiving terminals 31a and 31c is separated, and the power supply side electric wires 2a, 2b and the load side electric wire 3 are connected.
A blade receiving terminal 33 is provided for separating the insulator protrusions 2 and 3b.
5 is to be inserted. Insulator protrusion 2
5 and the blade receiving terminal 33 constitute a member for opening and closing the first current path. Note that the power source side electric wire 2b is connected to the blade receiving terminal 31a, and the power source side electric wire 2a is connected to the blade receiving terminal 31b. Further, the load side electric wire 3b is connected to the blade receiving terminal 31c, and the load side electric wire 3a is connected to the blade receiving terminal 31d.

Incidentally, as shown in FIG. 2, the length of the insulator projection 25 is shorter than the length of each blade receiving terminal 24a, 24c. In addition, the blade receiving terminal 31
The shapes of a and 31c are such that two blade holders 34 are respectively provided facing each other. Further, the blade holder 33 is similarly provided with two blade holders 35 facing each other. In addition, the blade receiving terminals 31b and 31d
It also consists of two blade holders.

Next, the operation of the structure configured as described above will be explained. When the electricity meter main body 20 is removed, each blade receiving terminal 31a, 31b, 31c, 31d
The blade holders 34 of the blade holders 34 are in contact with each other, and the blade holders 35 of the blade holder terminal 33 are also in contact with each other. Therefore, the power supply side electric wires 2a, 2b and the load side electric wires 3a, 3
It is directly connected to b.

Here, in order to attach the watt-hour meter main body 20, each blade-shaped terminal 24a, 24 in the watt-hour meter main body 20
b, 24c, and 24d into the respective blade receiving terminals 31a, 31b, 31c, and 31d of the socket terminal box 30. At this time, since the protrusion length of the insulator protrusion 25 is shorter than the protrusion length of the blade-shaped terminals 24a and 24c, each of the blade-shaped terminals 24a to 24d first
The voltage coil 21 is inserted in contact with a to 31d.
and current coil 22 is supplied with power. Thereafter, the insulator protrusion 25 is inserted into contact with the blade receiving terminal 33, and the direct connection between the power supply side electric wire 2b and the load side electric wire 3b is severed as shown in FIG. By the way, as described above, the insulator protrusion 25 and each blade-shaped terminal 24a to 24d are connected to each blade receiving terminal 33, 31a to 24d.
31d, each blade receiving terminal 33, 31a to 31 will be inserted while sliding.
Even if there is a foreign substance in the area d, it will be pushed out, and if corrosion occurs, it will be scraped off.

Next, when removing the electricity meter main body 20, first, the insulator protrusion 25 is detached from the blade receiving terminal 33, and each blade receiving terminal 33 contacts each other, so that the power supply side electric wire 2b and the load side electric wire 3b is directly connected. Thereafter, each of the blade terminals 24a to 24d is detached from each of the blade receiving terminals 31a to 31d. Therefore, even if the power meter main body 20 is removed, there will be no power outage on the load side.

In this way, in the first embodiment, when the power meter main body 20 is attached, the power supply side electric wires 2a,
2b and the load-side electric wires 3a, 3b, the insulator protrusion 25 is structured to slide into and out of the blade receiving terminal 33, so that when installing the watt-hour meter main body 20, Even if foreign matter is caught in each of the blade receiving terminals 33 or 31a to 31d, these will be pushed out, and even if the surface is corroded, it will be scraped off and the same effect as cleaning can be achieved. Therefore, the electrical conductivity of the contact surface is always good and the contact resistance does not increase.

Next, a second embodiment of the present invention will be described with reference to the configuration diagrams shown in FIGS. 4 and 5. In addition, to explain the different parts compared to the first embodiment, that is, the members for opening and closing the first current path and the other configurations, the substrate 4
0 has no insulator protrusion formed thereon, and each of the blade-like terminals 41a, 41b, 41c, and 41d has a metal terminal 42a connected to the voltage coil 21 or the current coil 22 at the outer portion thereof, as shown in FIG. ,42b,
..., and the inside thereof is formed of insulators 43a and 43b. Note that each metal terminal 42a, 42b, . . . is formed to extend slightly inward.

With this configuration, each blade-shaped terminal 41
The metal terminals 42a, 42b, .
It is inserted in a to 31d. Therefore, after power is supplied to the voltage coil 21 and current coil 22 of the watt-hour meter main body 20, the power supply side electric wire 2b and the load side electric wire 3b are disconnected. In addition, the electricity meter main body 20
When the metal terminals 42a, 42b,
...The part that extends slightly inside the power supply side electric wire 2b
and the load-side electric wire 3b are directly connected, and then the watt-hour meter main body 20 is removed.

Therefore, even with the above configuration, each blade receiving terminal 3
Even if foreign matter is caught between 1a to 31d, it will be pushed out, and even if there is corrosion, it will be removed, and the same effect as in the first embodiment can be achieved.

It should be noted that the present invention is not limited to the above embodiments, and can be modified without departing from the spirit thereof. Further, the members for opening and closing the first current path as shown in FIGS. 6 and 7 for connecting and disconnecting the power supply side electric wire and the load side electric wire are arranged as follows. In FIG. 6, an L-shaped conductor 50 is provided for each of the blade receiving terminals 13a and 31c, and a contact plate 51 is provided for connecting these L-shaped conductors 50, and this contact plate 51 is always supported by two springs 52. Both L-shaped conductors 50 are kept in contact. Then, when the power meter main body 20 is attached, the insulator protrusion 25 pushes the contact plate 51, thereby separating the power supply side electric wire and the load side electric wire. Further, the means shown in FIG.
1a is provided with an L-shaped conductor 53, and the blade receiving terminal 31c is provided with a leaf spring 54. Normally, the leaf spring 54 is connected to the L-shaped conductor 5.
Leave it in contact with 3. Then, the electricity meter main body 20
When attaching the leaf spring 5, the insulator protrusion 25
4 is pressed, and the power supply side electric wire and the load side electric wire are disconnected.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to provide a cleaning action to prevent foreign objects from getting caught, and also to prevent corrosion, eliminate increase in contact resistance, and provide uninterrupted power with a simple configuration. Can provide terminal structure for meter.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a first embodiment of the terminal structure of a power meter according to the present invention, FIGS. 2 and 3 are action explanatory diagrams of the structure shown in FIG. 1, and FIGS. The drawings are block diagrams showing a second embodiment of the present invention, FIGS. 6 and 7 are block diagrams showing modified examples, and FIGS. 8 and 9 are diagrams showing conventional structures. 2a, 2b... Power supply side electric wire, 3a, 3b... Load side electric wire, 20... Energy meter body, 23... Board, 24a, 24b, 24c, 24d... Blade-shaped terminal, 25... Insulator protrusion , 30...Socket terminal box, 31a, 31b, 31c, 31d...Blade receiving terminal, 33...Blade receiving terminal.

Claims (1)

[Scope of Claims] 1. A socket terminal box having first and second current paths independently formed therein; and a strip-shaped socket terminal box disposed at a distance from each other on the bottom surface of the socket terminal box. The conductor is bent into an L-shape, and one end of the two blade holders is curved into a substantially U-shape. a plurality of blade receiving terminals electrically connected in series to each of the current paths of No. 2; and one end thereof, which is fixed through and through a position corresponding to each of the blade receiving terminals on an insulating substrate that can be stored in the socket terminal box. a plurality of blade-shaped terminals to which a current coil and a voltage coil of the watt-hour meter are respectively connected, and whose other ends are slidably inserted into and slidably removed from the contact portions of the blade-receiving terminals; and the socket terminal box. is provided in a first current path, and when each of the blade-shaped terminals is slidably inserted into each of the blade receiving terminals, the first current path is opened, and the electric power is connected to the second current path. A member to which a current coil and a voltage coil of the meter are electrically connected, and in which the first current path is closed when each of the blade-shaped terminals is slid and removed from each of the blade-receiving terminals. Terminal structure of electricity meter.