JP7200626B2 - Electricity meter and fixture - Google Patents

Description

The present invention relates to a watt-hour meter for measuring the amount of electricity used, for example, in general households. It relates to weighing scales.

A watt-hour meter is interposed between a power supply side wire through which electric power from an electric power company is conducted and a load side wire through which power is conducted to a consumer's home, and measures the amount of electricity used in the consumer's home. Generally, a single-phase three-wire system is adopted for the power supply side wire and the load side wire, and a total of six wires are used.

When replacing a watt-hour meter, etc., the order of connection and disconnection of the power supply side wire and the load side wire is important, and if this is not done, it will lead to an unexpected accident. For this reason, the grounding wire is colored white, and the other two wires are colored red and black. It is

In Patent Document 1, a second terminal cover is provided between a terminal portion and a first terminal cover, and a portion for covering the grounding terminal is provided in the second terminal cover. and the ground wire connection.

JP-A-2007-17099

However, in the invention of Patent Document 1, it is up to the operator to determine whether the second terminal cover is attached or removed, and it is impossible to completely overcome operator mistakes. However, there is a problem that it is impossible to completely eliminate procedural errors and erroneous connections.

Moreover, attaching and detaching the second terminal cover during work itself is troublesome, leading to an increase in work man-hours and work time.

Furthermore, the connection between the electric wire and the terminal requires a part called a terminal cover, which is essentially unnecessary, and there is also the problem that the number of parts increases.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a watt-hour meter capable of observance of the procedure for connecting/disconnecting a meter (terminal) and a wire, shortening the working time, and preventing erroneous connection.

In order to solve the above problems, the invention of claim 1 comprises a terminal part in which a plurality of terminals are arranged side by side, and a fixture attached to the terminal part for connecting an electric wire to the terminal, The fixture includes a first fixing part for connecting a first wire to a first terminal, and a first fixing part attached to the terminal portion to avoid the first fixing part and cover the first terminal. A storage portion is formed, and a second fixing component for separately connecting another electric wire to a terminal other than the first terminal is provided.

According to this invention, if the first fixing component for connecting the first electric wire to the first terminal is not attached to the terminal portion, the second fixing component for connecting the other electric wire to the other terminal is mounted. Parts cannot be attached to terminals.

According to a second aspect of the invention, there is provided the watt-hour meter according to the first aspect, wherein a first attachment means for attaching a first fixing component for connecting the first electric wire to the first terminal to the terminal portion; a second attachment means for attaching a second fixing component to the terminal portion for connecting the second wire to the other terminal, and when each fixing component is attached to the terminal portion, the first electric wire It is characterized in that the terminals are connected to the other terminals, and the other electric wires are connected to the other terminals.

The invention according to claim 3 is the watt-hour meter according to claim 1, wherein the first temporary fixing means for temporarily fixing the first fixing part to the terminal part and the second fixing part for temporarily fixing the second fixing part to the terminal part 2 temporary fixing means, first connection means for connecting the first wire to the first terminal, and second connection means for connecting each other wire to each other terminal, the first connection means and the second 2. When each electric wire is connected to each corresponding terminal by the connecting means, attachment of the first fixing part and the terminal portion by the first temporary fixing means and the second temporary fixing means, and the second temporary fixing means. It is characterized in that the attachment of the second fixing component and the terminal portion by is completed.

According to the invention of claim 4, in the watt-hour meter according to any one of claims 1 to 3, each fixing part is connected to a portion corresponding to each electric wire on the front surface of the second fixing part. and a mark (color) having the same color as the coating of each electric wire.

According to a fifth aspect of the invention, there is provided a fixture attached to a terminal portion of a watt-hour meter for connecting an electric wire to the terminal portion, the first fixing device for connecting the first electric wire to the first terminal. and a storage part for covering the first terminal while avoiding the first fixing part attached to the terminal part, and other electric wires are separately connected to the terminals other than the first terminal. and a second fixation part for holding.

According to the inventions of claims 1 and 5, first, the first fixing part is attached to the terminal portion, and the second fixing part is attached to the terminal unless the connection between the first electric wire and the first terminal is performed. Since it cannot be attached to the part, it is possible to avoid connecting wires and terminals in the wrong order. The connection between the first electric wire and the first terminal cannot be removed unless the connection with the terminal is removed, and the order of removing the connection between the electric wire and the terminal is not mistaken.

According to the second aspect of the invention, an attaching means for attaching the fixing part to the terminal is provided, and the electric wire and the terminal are connected when the fixing part is attached to the terminal by the attaching means. The number of parts and man-hours for mounting can be reduced.

According to the third aspect of the invention, a temporary fixing means for temporarily fixing the fixing part to the terminal part is provided so that the attachment of the fixing part and the terminal part is completed when the electric wire is connected to the terminal. In addition, the number of parts and man-hours for mounting can be reduced, and since the connection between the wire and the terminal is connected, it is possible to improve the tightening failure of both, and to suppress the occurrence of abnormal voltage.

According to the invention of claim 4, since the mark of the same color as the coating color of each electric wire is provided on the front surface of the second fixing part and corresponding to each electric wire, erroneous connection is visually prevented. be able to.

Embodiment 1 of the present invention is shown together with FIGS. 2 and 3. This figure is an exploded perspective view showing how the electric wires and fixing parts are attached to the main body of the entire watt-hour meter. . FIG. 4 is a horizontal cross-sectional view showing a procedure for attaching each wire to the main body, where (a) shows the .about. state, (b) the .about. state, and (c) the .about. state. The front view of the state where each fixing component was attached to the main body is shown, (a) shows a 1st fixing component, (b) shows a 2nd fixing component, respectively. Embodiment 2 of the present invention is shown together with FIG. ) indicates the first fixing part, and (b) indicates the second fixing part, respectively. It is a horizontal cross-sectional view showing the procedure for attaching each electric wire to the main body, (a) shows how the first fixing part is attached to the terminal part, (b) how the second fixing part is attached to the terminal part, ( c) shows the state in which the first fixing part and the second fixing part are attached to the terminal portion.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the illustrated embodiments.

(Embodiment 1)
FIG. 1 is a perspective view showing an outline of a watt-hour meter 1 according to the first embodiment.

2(a) to 2(c) are cross-sectional views showing the process of attaching each electric wire to the terminal of the watt-hour meter 1. FIG.

FIG. 3 is a front view showing a state in which each wire is attached to the terminal of the watt-hour meter 1. (a) is the state in which the central wire is attached by the first fixing part, and (b) is the second fixing part. It shows a state in which the electric wires on both the left and right sides are attached by parts.

As shown in FIG. 1, the watt-hour meter 1 includes a measuring unit 2 for measuring the amount of power used by the consumer, a display unit 3 for displaying the measurement results, primary and secondary electric wires 4, 4, and terminal portions 5, 5 to which are connected.

Three primary side terminals 6, 6, 6 for single-phase three-wire are connected to the terminal portions 5, 5, to which the primary side electric wires 4, 4, 4 are connected to the terminal portion 5 on the left side as viewed from the front side. Three secondary side terminals 6, 6, 6 for single-phase three wires to which the secondary side electric wires 4, 4, 4 are connected are arranged in the terminal portion 5 on the right side.

The connection between the wires 4, 4, 4 on the primary side (left side) and the terminal portion 5 and the connection between the wires 4, 4, 4 on the secondary side (right side) and the terminal portion 5 are attached with the same structure. Therefore, the connection between the secondary electric wires 4, 4, 4 on the right side and the terminal portion 5 will be described.

As for electric wires 4, 4, 4, the central ground wire (corresponding to the "first electric wire" in the claims) 4w has a white covering, the left electric wire 4r has a red covering, and the right electric wire 4b has a white covering. is black.

Of the three terminals 6 , 6 , 6 , screw holes 7 , 7 are provided on both left and right sides of a central grounding terminal (corresponding to a “first terminal” in claims) 6 a , and screw holes 7 , 7 are provided on the left side terminal 6 . A screw hole 8 is formed on the left side, and a screw hole 8 is formed on the right side of the right terminal 6, respectively.

Attached to the terminal portion 5 is a fixture 9 for connecting the wires 4, 4, 4 to the terminals 6, 6, 6, respectively.

The fixture 9 has a first fixing part 10 and a second fixing part 15 as will be described later.

The connection between the central grounding wire 4w and the central grounding terminal 6a is performed by the first fixing component 10. As shown in FIG.

The first fixing part 10 is made of a rectangular block body, and a groove 11 extending vertically is formed on the rear surface thereof. , the depth of which is slightly smaller than the diameter of the grounding wire 4w.

Screw insertion holes 12, 12 penetrating in the same direction as the depth direction of the groove 11 are formed on the left and right sides of the groove 11 so as to sandwich the groove 11 of the first fixing component 10. These screw insertion holes 12, 12 are The screw holes 7, 7 formed on both left and right sides of the central grounding terminal 6a are opposed to each other.

The second fixing part 15 is wider than the first fixing part 10 and has a storage part 16 formed in the center thereof for storing the first fixing part 10. 17 is formed.

A white coating 10w is applied to the front surface of the first fixing component 10, which is the same white color as the covering of the grounding wire 4w. 4r (red) or 4b (black).

The storage part 16 of the second fixing part 15 has substantially the same size as the outer shape of the first fixing part 10, so that the first fixing part 10 can be accommodated in the storage part 16 almost exactly.

The two grooves 17, 17 of the second fixing component 15 are formed in the same size and shape as the groove 11 of the first fixing component 10 described above.

Screw insertion holes 18, 18 penetrating in the same direction as the depth direction of the groove 17 are formed on the left and right sides of the two grooves 17, 17 of the second fixing component 15, respectively. The holes 18, 18 face the screw holes 8, 8 formed on the left or right side of the left or right terminals 6, 6, respectively.

The front surface of the second fixing component 15 is painted with red for the left portion 15r, white for the center portion 15w, and black for the right portion 15b as marks. Alternatively, it is possible to easily visually determine that the electric wire 4b (black) should be inserted into each of the recessed grooves 26, 26, and it is possible to prevent erroneously attaching electric wires of different colors.

Connections between the electric wires 4w, 4b, 4r and the terminals 6, 6, 6 by the first fixing part 10 and the second fixing part 15 are performed as follows.

First, the conductor portion of the central grounding wire 4w is fitted into the concave groove 11 of the first fixing component 10, and from this state, the conductor portion of the grounding wire 4w is connected to the central grounding terminal 6a of the terminal portion 5. Then, the screws 13, 13 are passed through the screw insertion holes 12, 12 and screwed into the screw holes 7, 7 of the terminal portion 5. As shown in FIG. The screw holes 7, 7 and the screws 13, 13 function as attachment means. At this time, the grounding wire 4w is connected to the terminal 6 because the depth of the groove 11 is slightly smaller than the diameter of the wire of the grounding wire 4w.

Next, the conductor portions of the electric wires 4r and 4b are fitted into the recessed grooves 17 and 17 of the second fixing part 15, respectively, and from this state, the conductor wires of the electric wires 4r and 4b are connected to the left and right terminals 6 and 6 of the terminal portion 5. The parts are brought into contact with each other, and the screws 19, 19 are screwed into the screw holes 8, 8 of the terminal portion 5 through the screw insertion holes 18, 18, respectively. At this time, since the depth of the grooves 17, 17 is slightly smaller than the diameter of the wires of the wires 4r, 4b, the wires of the wires 4r, 4b are connected to the terminals 6, 6, respectively.

In the first embodiment, the second fixing component 15 cannot be attached until the first fixing component 10 is completely attached. 6, 6, 6 must first be connected to the central grounding wire 4w to the central grounding terminal 6a. Mistakes in the procedures and connections are prevented. Conversely, when removing the connected electric wires 4w, 4r, 4b and the terminals 6, 6, 6, the second fixing part 15 must be removed from the terminal portion 5, otherwise the grounding wire 4w is connected to the grounding terminal 6a. You can follow the procedure when disconnecting.

(Embodiment 2)
The second embodiment differs from the first embodiment only in the manner of attaching the two fixing parts to the terminal portion 5, and the other parts are the same. Therefore, only different parts will be explained, and explanations of other parts will be omitted by assigning the same reference numerals as in the first embodiment.

L-shaped cross-sectional grooves 20, 20 are formed on both left and right sides of the central grounding terminal 6a, similarly, an L-shaped cross-sectional groove 27 is formed on the left side of the left terminal 6, and the same is formed on the right side of the right terminal 6. A cross-sectional L-shaped groove 27 is formed in each of the .

The first fixing component 25 is formed with a groove 26 extending in the longitudinal direction on the back side in substantially the same manner as the first fixing component 10 in the first embodiment. Protrusions 27, 27 projecting outward and extending in the vertical direction are formed on the left and right legs constituting the recessed groove 26, respectively. The first fixing component 25 is attached to the terminal portion 5 by being inserted into the terminals 20, 20 from below. At this time, the projections 27, 27 of the first fixing part 25 are inserted into the cross-sectional L-shaped grooves 20, 20 with some leeway with respect to the terminal part 5, functioning as temporary fixing means.

With the first fixing part 25 attached to the terminal part 5, the conductor of the grounding wire 4w is fitted into the recessed groove 26 in such a manner that it is substantially tight in the lateral direction and slightly loose in the depth direction. It's big.

A threaded hole 28 is formed through the first fixing part 25 from the front side into the recessed groove 26 , and a tightening screw 29 is screwed into the threaded hole 28 from the front side. When the tightening screw 29 is tightened into the screw hole 28, the tip of the tightening screw 29 presses the grounding wire 4w from the front, connects the grounding wire 4w to the terminal 6, and the reaction force acts as a temporary fixing means. The inserted state between the L-shaped grooves 20, 20 and the ridges 27, 27 is tightened. Accordingly, screwing of the tightening screw 29 into the threaded hole 28 functions as connecting means.

The second fixing component 30 is formed with a storage portion 31 for storing the first fixing component 25 at the center of the rear surface in substantially the same manner as the second fixing component 15 in the first embodiment. Two recessed grooves 32, 32 are formed so as to sandwich them. In addition, ridges 33, 33 projecting outward and extending in the vertical direction are formed on the rear side of the left and right side surfaces of the second fixing component 30, respectively. The second fixing component 30 is attached to the terminal portion 5 by being inserted from below into the L-shaped cross-sectional grooves 21 , 21 . At this time, the second fixing part 30 is in a state in which the protrusions 33, 33 are slightly inserted into the L-shaped grooves 21, 21 with respect to the terminal portion 5, and functions as temporary fixing means.

The recessed grooves 32, 32 of the second fixing part 30 are fitted into the grooves 32, 32 of the second fixing part 30 in such a manner that the electric wires 4r, 4b are fitted to the terminal part 5 in such a manner that the wires 4r, 4b are almost exactly the same in the left-right direction and have a slight margin in the depth direction. It is sized to

Screw holes 34, 34 are formed through the grooves 32, 32 from the front side of the second fixing part 30, and screws 35, 35 are screwed into the screw holes 34, 34 from the front side. It's becoming When the tightening screws 35, 35 are tightened into the screw holes 34, 34, the tips of the tightening screws 35, 35 press the electric wires 4r, 4b from the front, connecting the electric wires 4r, 4b to the terminals 6, 6 and in the opposite direction. The force tightens the inserted state of the cross-sectional L-shaped grooves 21, 21 and the ridges 33, 33 as temporary fixing means. Accordingly, the screwing of the tightening screws 35, 35 into the threaded holes 34, 34 functions as connecting means.

Connections between the wires 4w, 4b, 4r and the terminals 6, 6, 6 by the first fixing part 25 and the second fixing part 30 are performed as follows.

First, the conductor portion of the central grounding wire 4w is fitted into the recessed groove 26 of the first fixing part 25, and from this state, the ridges 27, 27 are placed on both left and right sides of the central grounding terminal 6a of the terminal portion 5. is inserted from below into the L-shaped grooves 20, 20 in the cross section, and the conductor portion of the grounding wire 4w is brought into contact with the grounding terminal 6a. Then, the tightening screw 29 is screwed into the screw hole 28 of the first fixing part 25 from the front to connect the grounding wire 4w to the grounding terminal 6a. When the grounding wire 4w is connected to the grounding terminal 6a by the tightening screw 29, the reaction force strengthens the connection between the ridges 27, 27 and the cross-sectional L-shaped grooves 20, 20, and the first fixing part 25 is fixed. It is fixed to the terminal portion 5 .

Next, the conductor portions of the electric wires 4r and 4b are fitted into the concave grooves 32 and 32 of the second fixing component 30, respectively, and from this state, the ridges 33 and 33 are attached to the left and right terminals 6 and 6 of the terminal portion 5. The conductor portions of the electric wires 4r and 4b are brought into contact with the terminals 6 and 6 by inserting them from below into the L-shaped cross-sectional grooves 32 and 32 on both left and right sides. At this time, the first fixing component 25 already attached to the terminal portion 5 is accommodated in the accommodating portion 31 of the second fixing component 30 .

Then, the tightening screws 35, 35 are screwed into the screw holes 34, 34 of the second fixing part 30 from the front to connect the electric wires 4r, 4b to the terminals 6, 6. As shown in FIG. By connecting the wires 4r, 4b to the terminals 6, 6 by the tightening screws 35, 35, the reaction force strengthens the connection between the ridges 33, 33 and the cross-sectional L-shaped grooves 21, 21, thereby securing the first fixing part. 25 is fixed to the terminal portion 5 .

Even in the second embodiment, the second fixing component 30 cannot be attached until the first fixing component 25 is completely attached. 6, 6, 6 must first be connected to the central grounding wire 4w to the central grounding terminal 6a. Mistakes in the procedure are prevented. Conversely, when removing the connected electric wires 4w, 4r, 4b and the terminals 6, 6, 6, the second fixing part 30 must be removed from the terminal portion 5, otherwise the grounding wire 4w is connected to the grounding terminal 6a. You can follow the procedure when disconnecting.

In the second embodiment, the degree of connection (contact) between the wires 4, 4, 4 and the terminals 6, 6, 6 is adjusted by the degree of tightening of the tightening screws 29, 35, 35. It is possible to suppress the occurrence of abnormal voltage due to insufficient tightening.

Although the embodiments of the present invention have been described above, the specific configuration is not limited to the above-described embodiments, and the present invention may be modified without departing from the gist of the present invention. include.

1 Watt-hour meter 4 Wire 4w Grounding wire (white) (first wire)
4r left wire (red)
4b Right wire (black)
5 Terminal portion 6a Grounding terminal (first terminal)
6 terminal 7 screw hole (attachment means)
8 screw holes (attachment means)
9 fixture 10 first fixing part 10w mark (white)
13 screws (attachment means)
15 second fixing part 15w mark (white)
15r mark (red)
15b mark (black)
16 Storage portion 17 Groove 19 Screw (attachment means)
20 L-shaped cross-sectional groove (temporary fixing means)
21 L-shaped cross-sectional groove (temporary fixing means)
24 Fixing tool 25 First fixing part 26 Groove 27 Protruding strip (temporary fixing means)
28 screw hole 29 tightening screw (connection means)
30 Second fixing component 31 Storage portion 32 Two concave grooves 33 Protrusions (temporary fixing means)
34 screw holes
35 tightening screw (connection means)

Claims (5)

a terminal portion in which a plurality of terminals are arranged in parallel;
a fixture attached to the terminal portion for connecting an electric wire to the terminal;
The fixture includes a first fixing component for connecting the first wire to the first terminal;
A housing portion is formed to avoid the first fixing component attached to the terminal portion and cover the first terminal, and a second housing portion is formed for separately connecting other electric wires to the terminals other than the first terminal. and 2 fixing parts. a first attachment means for attaching a first fixing component for connecting the first electric wire to the first terminal to the terminal portion;
a second attachment means for attaching a second fixing component for connecting another electric wire to another terminal to the terminal portion;
When each fixing part is attached to the terminal part, the first electric wire is connected to the first terminal, and the other electric wires are connected to the other terminals.
The watt-hour meter according to claim 1, characterized in that: a first temporary fixing means for temporarily fixing the first fixing component to the terminal portion;
a second temporary fixing means for temporarily fixing the second fixing component to the terminal portion;
a first connection means for connecting the first wire to the first terminal;
A second connection means for connecting each other electric wire to each other terminal,
When each electric wire is connected to each corresponding terminal by the first connection means and the second connection means, attaching the first fixing component and the terminal portion by the first temporary fixing means and the second temporary fixing means ; The attachment of the second fixing component and the terminal portion by the second temporary fixing means is completed,
The watt-hour meter according to claim 1, characterized in that: A mark of the same color as the coating color of each electric wire connected by the second fixing component is provided at a portion corresponding to each electric wire on the front of the second fixing component,
The watt-hour meter according to any one of claims 1 to 3, characterized in that: A fixture attached to a terminal portion of a watt-hour meter for connecting an electric wire to the terminal portion,
a first fixing component for connecting the first wire to the first terminal;
A housing portion is formed to avoid the first fixing component attached to the terminal portion and cover the first terminal, and a second housing portion is formed for separately connecting other electric wires to the terminals other than the first terminal. 2 fixing parts.

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