JPS6241260Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a power meter embedded in a switchboard. More specifically, it relates to the outer box of such a power meter.

Technical background of the invention Electric energy meters (hereinafter referred to as ``meters'') come in two types, depending on the mounting method: surface-mounting types and switchboard-embedded types. In the conventional power distribution board embedded installation type, a meter is embedded in a hole drilled in a power distribution board, and the front part of the meter partially protrudes from the surface of the power distribution board and is fixed with screws or the like. When used for electricity trading, it is a matter of fact that the meter must be certified by a public institution before use, and a certification seal must be placed on the outer box to prevent the inside of the certified meter from being touched. A structure that can be applied is required.

FIG. 1 and FIG. 2 show a conventional meter installed in a switchboard.

As shown in FIGS. 1 and 2, the conventional meter body 2 is attached to the base 1 using the mounting hole 3 of the meter body 2, and the meter body 2
Connect the lead wire 2a of the coil included in the base 1
After connecting the terminal 1a fixed to the terminal 1a with the screw 4, insert the rectangular cylindrical case body 6 from the front of the instrument, and insert it from the front of the instrument into the hole of the support fixed to the inner surface of the case 6 by welding or the like. The body 6 and the base 1 are connected by screwing the mounting screw 7 into the screw hole 1b of the base 1 and tightening it. Next, a cover 8 having a transparent window 8a made of glass or the like is placed on the front surface, and a mounting screw 9 having a hole 9a for passing a sealing wire through the head is passed through the mounting hole 8b of the cover 8, and then the case body is inserted. 6
screw into the screw hole 6c of the cover 8 and case body 6.
combine. The cover 8 also has a sealing wire passage hole 8c formed near the attachment hole 8a.

Gaskets 5 to 10 are inserted between the base 1 and the case body 6, and between the case body 6 and the cover 8, respectively, so that the instrument body 2 is sealed.

The screw 11 attached to the flange portion 6b provided near the front of the case body 6 is provided for fixing the meter, and before installing the meter, it must be removed once and the meter is embedded in the switchboard. After that,
Fix the meter by passing it through the small hole drilled around the meter embedding hole in the switchboard.

Problems with the Background Art In the conventional instrument described above, in order to connect the base 1 and the case body 6, the instrument body 4 and the case body 6 are
Since the screw 7 had to be passed through a small mounting hole through a slight gap between the two, the following drawbacks occurred.

(1) Touching the tip of the screwdriver to any part of the instrument body 2 may damage the coil, etc., which may lead to a serious accident.

(2) While tightening the screw 7, the screw may fall into the instrument, and it is quite difficult to remove it.

(3) Workability is poor and it takes a lot of work time.

Purpose of the invention The present invention has been made in consideration of the above circumstances, and aims to eliminate the above-mentioned drawbacks, reduce the number of parts, and provide a power meter embedded in a switchboard that can be constructed economically. The purpose is to

Summary of the invention In order to achieve this purpose, the switchboard-embedded watthour meter of the present invention has a base placed on the back side of the watthour meter, a measured value display section on the front side, and a power meter mounted on the front side of the base. a meter body supported on the side, and a transparent window that covers all sides and the front of the meter body so as to enclose the meter body, and at least a part of the front is configured as a transparent window so that the measured value display section can be seen through; an integral case that forms an outer box together with the base, the case has a screw hole on a side facing the base, the base has a mounting hole at a position facing the screw hole, and the mounting hole The base and the case are characterized in that the base and the case are connected by screwing a screw into the screw hole and tightening the screw.

Embodiment of the invention Figures 3 to 6 show an embodiment of the invention. Hereinafter, the present invention will be explained in more detail with reference to this.

The instrument of the present invention mainly consists of an instrument body 2, a base 1 that supports the instrument body 2, and a rectangular cylindrical integrated case 6 that covers the front surface and all upper, lower, left, and right sides of the instrument body 2. A gasket 5 is inserted between the base 1 and the case 6, and a mounting screw 7 is screwed into the screw hole 6c provided on the back of the case 6 from the base 1 side through the mounting hole 1b drilled in the base 1. In particular, it is tightened. The screw hole 6c is formed in a built-up portion 6b provided at an inner corner portion of the side wall of the case 6 facing the base 1.

The front surface of the case 6 is configured as a transparent window 6a for seeing through the measured value display section 2b of the meter body 2, and is also integrally formed with a mounting flange section 6d that protrudes further laterally than the side wall surface. . Overlay portions 6 are provided at appropriate intervals on the back side of this mounting flange portion 6d.
e is provided, and a screw hole for screwing the mounting screw 8 is provided here.

The instrument body 2 is mounted on a mounting seat 1 provided on a base 1.
The mounting hole 2c of the instrument body 2 is inserted into the screw hole formed in b.
It is fixed to the base 1 by screwing the mounting screw 3 through it.

The seal of this instrument is made by drilling a sealing hole 9a for passing the sealing wire, as shown in FIG. Using the sealing screw 9, a corresponding sealing hole 1c is formed by cutting or molding near the mounting hole 1b through which the sealing wire can be passed in the surface direction of the base 1. After screwing in 9, seal hole 9a,
The sealing wire may be passed through 1c.

When assembling this instrument, first attach the instrument body 2 to the base 1 using the mounting screws 3, connect the lead wire 2a of the instrument body 2 to the terminal 1a of the base 1 using the terminal screw 4, and then The packing 5 is applied along the inner surface of the outer peripheral part of the base 1, and the case 6 is aligned. Then, the mounting screw 7 and the sealing screw 9 may be screwed into the screw hole 6c through the mounting hole 1b from the back side of the base 1, and then tightened.

The mounting screw 7 is generally provided at a corner, but may be provided at a location other than the corner in some cases. It is convenient to integrally mold the case 6 from plastic or the like, but in that case, it is of course unnecessary to separately provide the transparent window 6a by making the entire case from a transparent plastic material.

Effects of the invention In this invention, the cover and case body, which were conventionally separate parts, are integrated into a case, and the case and base are connected by a mounting screw inserted from the outside on the back side of the instrument. Therefore, the following effects can be achieved.

(1) The screws will not fall into the instrument while screwing in the mounting screws.

(2) Since there is no need to insert tools such as a screwdriver into the instrument to tighten the mounting screws, damage to the instrument body caused by tools during tightening work can be avoided.

(3) Since the tightening work is performed from outside the instrument, there are fewer restrictions during work and the work is easier.

(4) Since the conventional cover and case body can be constructed by integral molding, the number of parts can be reduced and cost can be reduced.

(5) An integrally formed case has higher mechanical strength than a case assembled from separate parts, and is less susceptible to deformation due to external forces.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a conventional electricity distribution board-embedded electricity meter, Fig. 2 is a cross-sectional side view of the main parts of the electricity meter, and Fig. 3 is an exploded perspective view showing an embodiment of the present invention. 4 and 5 are enlarged perspective views of the main parts of the watt-hour meter, and FIG. 6 is a sectional side view of the main parts of the watt-hour meter. 1...Base, 2...Measurement body, 6...Case, 6a...Transparent window, 7...Mounting screw, 9...Sealing screw.

Claims (1)

[Scope of Claim for Utility Model Registration] A base disposed on the back side of a watt-hour meter, a meter body with a measured value display section disposed on the front side and supported on the front side of the base, and a meter body containing the meter body. an integral case that covers all sides and the front of the instrument body, has at least a portion of the front as a transparent window so that the measured value display section can be seen through, and forms an outer case together with the base; The case has a screw hole on a side facing the base, and the base has a mounting hole at a position facing the screw hole, and the base can be tightened by screwing a screw into the screw hole through the mounting hole. A power meter embedded in a switchboard, characterized by a combination of a case and a case.