JP5456568B2 - Electricity meter - Google Patents

Description

  The present invention relates to an electronic watt-hour meter that inputs current and voltage and measures the amount of power, and more particularly to a mounting structure of a power amount measuring unit in the watt-hour meter.

  As a conventional electronic watt-hour meter, for example, there is one disclosed in Japanese Patent Application Laid-Open No. 2006-292442, and an electrode insertion in which an electrode (plug terminal) for measuring a voltage of a power amount measuring unit is provided in a meter base is provided. Part (outlet terminal).

  Further, the current terminal for measuring the current of the electric energy measuring unit is joined to the base side fixed terminal fixed to the meter base by a terminal screw. For example, a structure as disclosed in Japanese Patent Application Laid-Open No. 2003-28897 is applied to the current terminal. That is, the current terminal is arranged in the terminal recess provided between the terminal partitions of the terminal block.

  And the electric energy measuring unit to which the electrode (plug terminal) and the current terminal are respectively connected is fixed to the instrument base with a unit fixing screw.

JP 2006-292442 A JP 2003-28897 A

  In the conventional watt-hour meter described above, both the current terminal of the watt-hour measurement unit and the base-side fixed terminal of the meter base are fixed, and even if they are fastened and joined with terminal screws in this state, they are not necessarily stable joints. It is not always possible to obtain a state. That is, there is a problem that contact failure (high contact resistance) may occur between the current terminal and the base-side fixed terminal due to manufacturing errors and the like.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a watt-hour meter capable of obtaining a stable junction state between a current terminal and a base-side fixed terminal with a simple configuration. To do.

In the watt-hour meter according to the present invention, the current terminal is formed with a through hole through which the terminal screw is inserted, and a concave portion is formed at the position of the current terminal of the terminal block. A convex portion is formed on the current terminal so as to be fitted in the concave shape portion so as to be movable in the X direction, the Y direction, and the Z direction in a loosely fitted state .

  The watt-hour meter according to the present invention can provide a watt-hour meter capable of providing a stable joint state between the current terminal and the base-side fixed terminal with a simple configuration.

It is a perspective view which shows the watt-hour meter concerning Embodiment 1 of this invention. It is an expansion | deployment perspective view which shows the watt-hour meter concerning Embodiment 1 of this invention. It is a perspective view which shows the electric energy measurement unit in the watt-hour meter concerning Embodiment 1 of this invention. It is a back perspective view which shows the electric energy measuring unit in the watt-hour meter concerning Embodiment 1 of this invention.

It is sectional drawing in the AA of FIG. 3 which shows the watt-hour meter concerning Embodiment 1 of this invention. It is sectional drawing in the BB line of FIG. 3 which shows the watt-hour meter concerning Embodiment 1 of this invention.

It is an enlarged front view which shows the electric current terminal and base side fixed terminal in the watt-hour meter concerning Embodiment 2 of this invention. It is an enlarged front view which shows the electric current terminal and base side fixed terminal in the watt-hour meter concerning Embodiment 2 of this invention. It is an enlarged front view which shows the electric current terminal and base side fixed terminal in the watt-hour meter concerning Embodiment 2 of this invention. It is an enlarged front view which shows the electric current terminal and base side fixed terminal in the watt-hour meter concerning Embodiment 2 of this invention.

Embodiment 1.
Embodiment 1 of the present invention will be described below with reference to FIGS. 1 is a perspective view showing a watt-hour meter according to Embodiment 1 of the present invention. FIG. 2 is a developed perspective view showing the watt-hour meter according to Embodiment 1 of the present invention. FIG. 3 is a perspective view showing an electric energy measuring unit in the electric energy meter according to the first embodiment of the present invention. FIG. 4 is a rear perspective view showing the electric energy measuring unit in the electric energy meter according to the first embodiment of the present invention. 5 is a cross-sectional view taken along the line AA of FIG. 3 showing the watt-hour meter according to Embodiment 1 of the present invention. 6 is a cross-sectional view taken along the line BB of FIG. 3, showing the watt-hour meter according to Embodiment 1 of the present invention.

  In each of these drawings, 100 is an electronic watt-hour meter, and the embodiment shows a case of a three-phase three-wire system. Reference numeral 1 denotes a meter base serving as a base for the watt-hour meter 100, and reference numeral 2 denotes a power amount measuring unit in which a unit holding base 2a is housed and disposed in a unit housing portion 1a (FIG. 2) provided in the meter base 1. The power amount measuring unit 2 has a power amount display unit 3, a plug terminal 4 (FIG. 4) for measuring the voltage of each phase, and a current terminal 5 for measuring the current of each phase. .

  The current terminal 5 is configured to be held by the terminal block 6, and details will be described later. A terminal screw 8 for joining the current terminal 5 to a base-side fixed terminal 7 provided on the instrument base 1 is inserted into a terminal screw insertion portion 9 through a washer 10 and penetrates through a through hole 5a of the current terminal 5 to the base side. The fixed terminal 7 is screwed into the female screw hole 7a (FIGS. 2, 7, and 8). By passing the terminal screw 8 through the through-hole 5a (FIGS. 5 and 6) of the current terminal 5 and screwing into the female screw hole 7a of the base-side fixed terminal 7, the current terminal 5 and the base-side fixed terminal 7 are Are joined.

  The power amount measuring unit 2 is provided with a unit mounting portion 12 (FIG. 2) for fixing the power amount measuring unit 2 to a unit mounting bracket 11 provided on the meter base 1. A unit fixing screw 13 is inserted into the unit mounting portion 12 and is screwed into the unit mounting bracket 11 to fix the electric energy measuring unit 2 to the meter base 1.

  An instrument cover 14 formed of a transparent material covering the electric energy measuring unit 2 is attached to the cover mounting bracket 15 of the instrument base 1. A cover mounting screw 17 is inserted into a cover mounting portion 16 provided on the instrument cover 14, and is screwed to a cover mounting bracket 15 to fix the instrument cover 14 to the instrument base 1.

  The meter base 1 is provided with an outlet terminal 18 into which the plug terminal 4 of the electric energy measuring unit 2 is inserted and connected. A partition wall 19 is provided between the base-side fixed terminals 7. A terminal box 21 in which the power supply side load terminal 20 is disposed is attached.

  By the way, about the holding | maintenance state of the electric current terminal 5 and the terminal block 6, it has the following structures. That is, as shown in FIG. 5 which is a cross-sectional view taken along line AA in FIG. 3, the terminal block 6 is formed with a concave portion 22, and the current terminal 5 is provided with a concave portion 22 provided on the terminal block 6. The convex portion 23 is formed so as to be fitted in the loosely fitted state.

  As shown in FIG. 5, the convex portion 23 of the current terminal 5 can move in the Z1 direction or the Z2 direction in a loosely-fitted state within the concave portion 22 of the terminal block 6, and can play in the X1 direction or the X2 direction. It can move in the fitted state.

  Further, as shown in FIG. 6 which is a cross-sectional view taken along line BB in FIG. 3, the convex portion 23 of the current terminal 5 is loosely fitted in the Z1 direction or the Z2 direction within the concave portion 22 of the terminal block 6. It can be moved in the state, and can be moved in the loosely fitted state in the Y1 direction or the Y2 direction. Further, the current terminal connecting piece 24 on the inside of the electric energy measuring unit 2 of the electric current terminal 5 is connected to the inner conductor 25 of the electric energy measuring unit 2, and the inner conductor 25 is, for example, a flexible wire constituted by a ground wire. It is what has.

  In the watt-hour meter according to the first embodiment configured as described above, the watt hour meter is fitted into the concave shape portion 22 provided in the terminal block 6 and the concave shape portion 22 provided in the terminal block 6 in a loosely fitted state. By providing the convex portion 23 provided on the current terminal 5 as described above, the current terminal 5 can be moved freely in the Z1 direction or the Z2 direction, the X1 direction or the X2 direction, the Y1 direction or the Y2 direction. Therefore, even if a manufacturing error of the current terminal 5 and the base-side fixed terminal 7 occurs, the current terminal 5 is moved in a direction in which the through hole 5a matches the female screw hole 7a of the base-side fixed terminal 7. In this state, by passing the terminal screw 8 through the through hole 5a of the current terminal 5 and screwing into the female screw hole 7a of the base side fixed terminal 7, the current terminal 5 and the base side fixed terminal 7 are A stable state In can be joined, it is possible to obtain a highly reliable power meter. The current terminal 5 is inserted in the Y1 direction.

  Further, by providing the unit holding base 2a in the electric energy measuring unit 2, when only the electric energy measuring unit 2 is placed outside the instrument base 1 by assembly or maintenance, the unit holding base 2a is stably placed. It is possible to prevent damage due to falling.

  Further, the unit holding base 2a is provided in the electric energy measuring unit 2 and the unit storage portion 1a is provided in the meter base 1, whereby the unit holding base 2a of the electric energy measuring unit 2 is stored in the unit storage portion 1a of the meter base 1. By doing so, the electric energy measuring unit 2 can be positioned, and assemblability can be improved.

Embodiment 2.
A second embodiment of the present invention will be described with reference to FIGS. FIG. 7 is an enlarged front view showing a current terminal and a base-side fixed terminal in the watt-hour meter according to Embodiment 2 of the present invention. FIG. 8 is an enlarged front view showing a current terminal and a base-side fixed terminal in the watt-hour meter according to Embodiment 2 of the present invention.

  Although the current terminal 5 and the base-side fixed terminal 7 are in contact with each other, generally, the contact surface width a of the current terminal 5 and the contact surface width b of the base-side fixed terminal 7 are set to the same width. . When the contact surface width a of the current terminal 5 and the contact surface width b of the base-side fixed terminal 7 are the same width, there is some variation in the contact surface width a of the current terminal 5, or the current terminal 5 is slightly When moved in the width direction, the contact area between the current terminal 5 and the base-side fixed terminal 7 is reduced, and the current terminal 5 and the base-side fixed terminal 7 are reliably joined in a stable state. It is assumed that it cannot be obtained.

  Therefore, in the second embodiment, as shown in FIGS. 7 and 8, the contact surface of the current terminal 5 is formed larger than the contact surface of the base-side fixed terminal 7.

  That is, according to the second embodiment, for example, the relationship between the contact surface width a of the current terminal 5 and the contact surface width b of the base-side fixed terminal 7 is a> b. Even if there is some variation in the contact surface width a or the current terminal 5 moves in the width direction, the current terminal 5 and the base-side fixed terminal 7 can be reliably joined in a stable state. Thus, a more reliable watt-hour meter can be obtained than in the first embodiment.

  In the second embodiment, the relationship between the contact surface width a of the current terminal 5 and the contact surface width b of the base-side fixed terminal 7 is a> b, but as shown in FIGS. The relationship between the contact surface width a of the current terminal 5 and the contact surface width b of the base-side fixed terminal 7 may be a <b.

  That is, since the relationship between the contact surface width a of the current terminal 5 and the contact surface width b of the base-side fixed terminal 7 is a <b, there is some variation in the contact surface width a of the current terminal 5. Even if the current terminal 5 moves slightly in the width direction, the current terminal 5 and the base-side fixed terminal 7 can be reliably joined in a stable state, and the same effect as in the second embodiment described above can be obtained. .

  The present invention is suitable for realizing a watt-hour meter that can be in a stable joined state between a current terminal and a base-side fixed terminal with a simple configuration.

DESCRIPTION OF SYMBOLS 1 Meter base 2 Electric energy measurement unit 4 Plug terminal 5 Current terminal 6 Terminal block 7 Base side fixed terminal 8 Terminal screw 18 Outlet terminal 22 Concave-shaped part 23 Convex-shaped part 100 Electric energy meter

Claims (3)

An electric energy measuring unit having a plug terminal for detecting voltage and a current terminal for detecting current provided on the terminal block, an outlet terminal provided on an instrument base to which the plug terminal is inserted, and the current terminal being a terminal In the watt hour meter comprising a base side fixed terminal provided on the meter base connected by a screw, the current terminal is formed with a through hole through which the terminal screw is inserted, and the current terminal of the terminal block A concave portion is formed at the position, and the convex portion is formed on the current terminal so as to be fitted in the concave portion formed on the terminal block so as to be movable in the X, Y, and Z directions. A watt hour meter characterized by forming .   2. The electric energy according to claim 1, wherein the current terminal and the base-side fixed terminal are in contact with each other, and the contact surface of the current terminal is formed larger than the contact surface of the base-side fixed terminal. Total.   2. The electric energy according to claim 1, wherein the base-side fixed terminal and the current terminal are in contact with each other, and a contact surface of the base-side fixed terminal is formed larger than a contact surface of the current terminal. Total.

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