JP3198722B2 - Watt hour meter terminal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal device for a watt hour meter suitable for a multi-phase watt hour meter having a large current capacity.

[0002]

2. Description of the Related Art First, FIG. 5 shows an assembling structure of a terminal device of a conventional three-phase AC watt-hour meter. In the figure, 1 is a main body of the watt-hour meter, 1a is a gutter-shaped terminal receiving fitting projecting downward from the main body 1, 2 is a terminal device incorporated in the terminal receiving apparatus 1a, 3 is a distribution line on the lead-in side, 4 is The distribution line 5 on the power consumer side is a crimp terminal attached to the distribution lines 3 and 4, and the terminal device 2 is a terminal that connects between the distribution lines 3 and 4 and the internal circuit of the watt hour meter main body 1. The terminal block 7 includes a terminal block 7 as a resin molded product having the metal fittings 6 and a terminal cover 8 covering the front surface of the terminal block 7. Further, a total of six distribution line insertion grooves 7b are formed in the terminal block 7 in a horizontal line with an interphase insulating partition wall 7a therebetween, and crimping of the distribution lines 3, 4 inserted one by one in each insertion groove. The terminal 5 and the terminal fitting 6 are fastened with a terminal screw 9. The internal circuit of the watt hour meter is well known.
Here, the description is omitted.

[0003]

By the way, in the conventional terminal device configured to connect the distribution lines on the service side and the power consumer side in a horizontal line as described above, the multi-phase power supply having a large current capacity is particularly required. In the case of a meter, there are the following problems.
That is, in the single-phase watt-hour meter, the total number of distribution lines on the service side and the power consumer side is four in total, so that the entire width is small even including the interphase insulating partition walls of the terminal block. Is within the width of the watt hour meter body. On the other hand, as a three-phase watt-hour meter used by power consumers having a relatively large current of 120 to 200 A, a distribution line is directly connected to a terminal device of the watt-hour meter without using a current transformer or the like. When using the terminal block, the number of distribution lines is 6, and the distribution lines are large and the crimp terminals are large in accordance with the current capacity. A becomes larger than the lateral width B of the watt hour meter main body, and as a result, the terminal device protrudes to the left and right from the main body of the watt hour meter, so that the space efficiency deteriorates.

The present invention has been made in view of the above points, and has as its object to solve the above-mentioned problems, and to reduce the lateral width of a terminal device required for direct connection with a distribution line on a service side or a customer side. An object of the present invention is to provide a terminal device of a watt-hour meter which can be reduced in size and size by substantially halving the structure.

[0005]

In order to achieve the above object, a terminal device according to the present invention comprises a front terminal fitting and a rear terminal fitting.
A two-tiered structure in which the step terminal fittings are lined up and down when viewed from the front
And a first part having an interphase insulating partition wall of the distribution line.
Insulated bottom between the split block and the front and rear distribution lines
A wall is provided and is detachably fitted to the first divided block.
And a second divided block that is assembled in an integral manner.

Further, the terminal fitting device having the above-mentioned structure can be embodied in the following assembling structure. (1) An inter-phase insulating partition is separated from the first divided block.
The rear side distribution line insertion groove formed in a row is formed in the second line.
The divided block has a configuration in which front side distribution line insertion grooves are arranged in a row in a row with an interphase insulating partition wall therebetween.

(2) Predetermined phase of front-stage distribution line and rear-stage wiring
Terminal to connect the predetermined phase of the
Connect the end of the metal fitting opposite to the side where
1, the drawing end extended from the second divided block,
In order to arrange the drawer end in a horizontal line toward the watt-hour meter main body, of the terminal fittings having the drawer end,
Bend one of the terminal fittings
You.

[0008]

According to the above construction, since the terminal block connected to the distribution line on the service side and the terminal block connected to the distribution line on the power consumer side overlap each other, the terminal block of the terminal block viewed from the front is overlapped. The width dimension is reduced to approximately half as compared with the arrangement in which all the distribution lines on the service side and the customer side are arranged in a horizontal line.

In this case, by constructing the terminal block divided into the front and rear stages so as to be fitted into the terminal block, the front block can be removed when connecting the distribution line to the rear block. There is no hindrance to wiring work. For the terminal fittings drawn out from the terminal block toward the watt-hour meter main body, the terminal fittings are bent and formed so that the leading ends of the terminal fittings arranged in the front and rear blocks are aligned in a horizontal line. This facilitates lead connection between the terminal fitting and the internal circuit of the watt hour meter.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. The illustrated embodiment is an embodiment for a three-phase watt-hour meter, and the same reference numerals are given to components corresponding to those in FIG. 5 in the drawing. First, FIGS. 1A and 1B show an assembly structure of the terminal device 2 in a state where the distribution lines 3 and 4 are connected. As can be seen from the figure, the distribution line 3 (# 1S to 3S) on the service side and the distribution line 4 (# 1L to 3L) on the power consumer side are divided into two front and rear rows as viewed from the front, and the terminals of the terminal block 7 are separated. It is connected to the metal fitting 6. Also, corresponding to the arrangement of such distribution lines,
As will be described later in detail, a rear-stage divided block 7A mainly composed of the terminal block 7, a front-stage divided block 7B incorporated in the divided block 7A, and a divided block 7C serving as an upper cover are fitted into each other. It is assembled from three blocks combined according to the formula, where the distribution line 3 is crimped to the terminal fittings arranged in the subsequent divided block 7A, and the distribution line 4 is crimped to the terminal fittings arranged in the preceding divided block 7B. They are connected via terminals 5 and terminal screws 9. Then, as shown in FIG. 2, the assembly of the terminal device 2 is assembled with a packing member 10 into a terminal receiving bracket 1a projecting downward from the watt hour meter main body 1 and fixed by screws.

According to such a configuration, the distribution line 3 on the service side and the distribution line 4 on the power consumer side are connected to the terminal block 7 in two front and rear rows, so that the width C of the terminal device 2 is limited. It is sufficient if there is a width dimension corresponding to three electric wires, and as shown in FIG. 5, the width is reduced to approximately 比 べ compared with the horizontal width A in which all six distribution lines are arranged in one horizontal line. Therefore, even if the current capacity is large and the crimping terminal 5 is large, the terminal device 2 does not protrude significantly from the watt-hour meter main body 1 to the left and right, and the entire meter can be made compact and compact. . The terminal fittings connected to the distribution lines 3 and 4 are separated from each other by interphase insulating partition walls formed on the divided blocks 7A and 7B of the terminal block 7 and the bottom wall of the divided block 7B. Insulation between the terminals is ensured.

Next, FIG. 3 shows a detailed structure of each component constituting the terminal device. First, as the terminal fitting 6, the distribution line 3
Metal terminal 6A connecting between the power supply meter and the watt hour meter main body, a terminal metal fitting 6B connecting between the distribution line 4 and the watt hour meter main body,
Three types of terminal fittings, namely, a terminal fitting 6C that directly connects the distribution lines 3 and 4, are prepared. On the other hand, the divided blocks 7A, 7
In the terminal block 7 assembled from B and 7C, three distribution line insertion grooves 7b are formed on the bottom side of the divided block 7A and are arranged side by side with an interphase insulating partition wall 7a therebetween. At the end, mounting seats corresponding to the respective terminal fittings 6A to 6C are formed so as to be arranged stepwise.

Further, the divided blocks 7B is coupled to detachably telescopically from the front to the divided blocks 7 A, the divided blocks 7A as well as interphase insulating partition wall 7a
And three distribution line insertion grooves 7b are formed therebetween. The division block 7B is positioned by fitting the projection 7d into the guide groove 7c with respect to the division block 7A. Further, the divided block 7C is
The projection 7e and the guide groove 7f are fitted together so as to cover the upper end surface of the terminal A, and the terminal fitting 6A,
7g through window for pulling out 6B toward the watt hour meter body
There has been an open aligned in a horizontal row.

The above-mentioned divided blocks 7A to 7C
Is fixed to the terminal receiving bracket 1a shown in FIG. 2 via the fastening screw 11, and a terminal cover 8 is attached to the front surface of the terminal block 7 by the fastening screw 8a. In addition, the assembly of the terminal block 7 includes the divided blocks 7A to 7A.
Needless to say, they are tightly joined to prevent dust and rainwater from entering through the joint of 7C.

Next, to supplement the shapes of the terminal fittings 6A to 6C, the tip of each terminal fitting has a conductor width so that the terminal fittings 6A and 6B are lined up in a row and pulled out from the window 7g of the divided block 7C. The terminal fittings 6B arranged on the front stage side are bent so that the front ends thereof are aligned with the leading ends of the terminal fittings 6A, and the intermediate portions thereof are bent so that the whole has a Z-shape. The terminal fitting 7C is bent in a Z-shape so that the front and rear end surfaces thereof are overlapped with a stepped mounting seat formed on the divided block 7A, and is fixed to a predetermined position of the divided block 7A by a fixing screw 12. In this installation state, four terminal fittings 6A,
Since the rear end of 6B is lined up in a row and is led out from the through window 7g of the divided block 7C toward the watt hour meter main body 1,
It is convenient for interconnection with the internal circuit of the watthour meter main body.

[0016] Then, for each terminal fittings 6A-6C, the mounting seat side of the terminal block are embedded beforehand Me hex nut 13, the crimp terminal 5 of the respective distribution lines 3 and 4 here
A terminal screw 9 for connecting (see FIGS. 1 and 2) to the terminal fittings 6A to 6C is screwed together with the washer 14 and the spring washer 15. With such a configuration, the distribution lines 3 and
In order to connect the power supply lines 4, first, with the terminal cover 8 and the divisional block 7 B removed, the distribution lines 3 are inserted one by one into the distribution line insertion grooves 7 b of the divisional block 7 A and crimped using the fastening bolts 9. The terminal 5 is connected to the terminal fittings 6A and 6C. Subsequently, the divided block 7B is fitted into the divided block 7A, and in this state, the distribution line 4 is inserted into the distribution line insertion groove 7b of the divided block 7B, and connected to the terminal fittings 6B and 6C with the terminal screws 9 as described above. Finally, the terminal cover 8 is put on the front surface of the terminal block 7 and fixed with screws 8a. This results in the connection state shown in FIG. A rubber packing for preventing dust and rainwater from entering from outside is attached to the inner peripheral edge of the terminal cover 8.

Next, FIG. 4 shows an applied embodiment of the present invention.
That is, in the above-described embodiment, the terminal block 7 is divided into three divided blocks 7A to 7C,
Although an example is shown in which A and 7C are coupled in a butt-type manner, in order to prevent rainwater from entering from the joint between the divided blocks 7A and 7C, in the embodiment of FIG. The lower surface is open), and a divided block 7 as shown and a divided block 7B (not shown) similar to that described in FIG. 3 are incorporated therein. In the embodiment shown in FIG. 4, the terminal fittings 6A and 6B are assembled as flat plates, and the through-holes for drawing out the terminal fittings 6A and 6B in the front and rear two rows in the upper end surface of the divided block 7C. 7g is open.

[0018]

As described above, according to the structure of the present invention, the width of the terminal block is reduced to approximately half as compared with the structure of the conventional terminal device. Therefore, even in the case of a multi-phase watt-hour meter with a large current capacity and the use condition in which each distribution line is directly connected to the terminal fitting via a large crimp terminal, the terminal device can be connected to the width of the watt-hour meter main body. It can be kept within the dimensions, so that the watt-hour meter can be made compact and compact as a whole.

[Brief description of the drawings]

FIGS. 1A and 1B show an assembly structure of a terminal device in a connected state of distribution lines according to an embodiment of the present invention, wherein FIG. 1A is a plan view and FIG.

FIG. 2 is an exploded perspective view showing a combination structure of the terminal device assembly and the watt hour meter main body in FIG. 1;

FIG. 3 is a divided perspective view showing a detailed structure of the terminal device in FIG. 1;

FIG. 4 is an exploded perspective view of a main part structure of a terminal device showing an application example of the present invention.

5A and 5B show a conventional assembling structure of a watt hour meter terminal device in a connection state with a distribution line, where FIG. 5A is a plan view and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Watt-hour meter main body 1a Terminal receiving bracket 2 Terminal device 3 Incoming side distribution line 4 Power consumer side distribution line 5 Crimp terminal 6, 6A-6C Terminal fitting 7 Terminal block 7A-7C Division block 8 Terminal cover 9 Terminal screw

Claims (4)

(57) [Claims] 1. A terminal device which is incorporated in an outer box of a watt-hour meter to connect distribution lines on a lead-in side and a power consumer side, wherein a front-stage terminal fitting and a rear-stage terminal fitting are arranged back and forth as viewed from the front. It provided with a stepped overlapping structure, phase insulation interval of the distribution line
A first divided block having a wall, and an insulating bottom wall for insulating between a front-side distribution line and a rear-side distribution line.
In addition, it is detachably fitted to the first divided block.
And a second divided block to be assembled . 2. The terminal device according to claim 1, wherein said first divided block is arranged in a row in a row with an interphase insulating partition wall interposed therebetween.
Forming a post-side distribution line insertion groove lined up with the second divided block;
Front side power distribution lined up in a row with locks separated by interphase insulating bulkheads
Terminal device of watt-hour meter characterized by forming wire insertion groove
Place. 3. The terminal device according to claim 1 , wherein a predetermined phase of a front-stage distribution line and a predetermined phase of a rear-stage wiring are connected to the power supply.
Connect each distribution line of the terminal fittings to connect to the internal circuit of the meter.
Connect the opposite end to the first and second divided blocks.
A terminal device for a watt-hour meter, wherein the terminal device has a drawing end extending from the base . 4. The terminal device according to claim 3, wherein the draw-out ends are arranged in a horizontal line toward the watthour meter main body.
Of the terminal fittings with the leading ends
Bend one of the terminal fittings
A terminal device for an electricity meter.