JP2007114025A - Electronic watthour meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic watthour meter having liquid crystal display fixing structure hardly applied with a stress onto a liquid crystal display, and capable of facilitating fixing work. <P>SOLUTION: A support structure part 102 is provided in an inside of the electronic watthour meter 100, a guide rail and a fixing part are provided in the support structure part 102, and the liquid crystal display 103 is fixed by the guide rail and the fixing part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electronic watt-hour meter that measures the power consumption of a system under measurement.

An electronic watt-hour meter that measures the amount of electric power used by a consumer includes a liquid crystal display that displays measurement results, and a fixed structure to which the liquid crystal display is attached. The fixing structure is generally fixed by a liquid crystal display with a metal fitting or resin.

Further, there is a liquid crystal display having a structure in which a fixing structure is added to the liquid crystal display itself (for example, Patent Document 1).
JP 2002-131748 A (page 7, FIG. 5)

However, when these fixing methods of the liquid crystal display are adopted, the fixing structure exerts stress on the liquid crystal display. For this reason, the problem that the liquid crystal display is broken or chipped may occur.
An object of the present invention is to provide an electronic watt-hour meter having a display fixing structure in which a display such as a liquid crystal display is not easily stressed and the fixing work is simple.

In order to achieve the above object, an electronic watt-hour meter according to the present invention includes a display, a guide rail portion that holds the end of the display, and a rotatable fixing portion that sandwiches the other end of the display. It has the supporting means provided, It is characterized by the above-mentioned.

According to the present invention, it is possible to provide an electronic watt-hour meter having a display fixing structure in which stress is not easily applied to a display such as a liquid crystal display and the fixing work is simple.

  Examples of the present invention will be described below.

A first embodiment of an electronic watt-hour meter according to the present invention will be described with reference to FIGS. 1, 2, 3, 4, 5, 6, and 7. FIG.

In FIG. 1, reference numeral 100 denotes an electronic watt hour meter housing, which is made of a metal or plastic member, and supports the internal components of the watt hour meter and protects the inside from external rain and wind.

A circuit unit 101 includes a power amount detection device, which detects a voltage supplied from the outside and a used current used on the load side, multiplies them, and converts them into used power amount data.

Reference numeral 102 denotes a support structure made of a resin such as polycarbonate, a liquid crystal display,
Support components such as batteries.
A display unit 103 includes a liquid crystal display or the like, and displays usage data calculated by the circuit unit 101.

A name plate 104 is manufactured by processing an aluminum plate or the like, and displays the rating, manufacturer, etc. of the measuring instrument, and exposes the display unit 103 from the opening to cover the unnecessary portions.

Reference numeral 105 denotes a transparent window made of glass or the like, which protects the inside of the electronic watt-hour meter and makes display items on the display unit 103 and the nameplate 104 visible from the outside.

Next, details of the structure of the support structure 102 will be described with reference to FIG. Reference numeral 201 denotes a guide rail which is made of the same material such as resin as that of the support structure unit 102 and holds one end of the display unit 103.
Reference numerals 202 a and 202 b denote protrusions, which are made of the same material such as resin as that of the support structure 102, and maintain the mounting position of the display unit 103.
Reference numeral 203 denotes a fixed portion, which is made of the same material as the support structure portion 102, such as resin, and holds the other end of the display portion 103. The fixing portion 203 is operated by the assembler by operating the knob portion 203a.
It has a structure that can rotate around 3b, and returns due to the elasticity of the resin that is the material,
The other end of the display unit 103 is held by the holder unit 203c.
Reference numeral 204 denotes a rotation hole, which is a space provided in the support structure portion 102 and secures a space in which the fixing portion 203 rotates.
Reference numeral 205 denotes a stopper which limits the rotation range so that the fixing portion 203 is not damaged by the rotation.
Reference numeral 206 denotes a battery case, which is formed in a box shape from the same material as the support structure 102, such as resin, and holds the battery.
Reference numeral 207 denotes a band portion, which is made of the same resin material as that of the support structure portion 102 and has a battery case 206.
The battery is fixed.
Reference numeral 208 denotes a drop-off preventing structure, and part of the battery case 206 is made of the same material as the support structure 102, such as resin, to prevent the battery from falling off.
Reference numeral 208a denotes a claw-like structure, and a fall-off prevention structure 2 made of the same material as the support structure 102, such as resin.
Part of No. 08 is configured and engaged with one end of the battery to prevent falling off. Here, a battery engaged by the drop-off prevention structure 208 is a battery 401 described later, for example, a lithium battery, and serves as a power source for operation of the circuit unit 101.

Next, the operation of this embodiment will be described with reference to FIGS.

First, a case where the display unit 103 is attached to the support structure unit 102 will be described. As shown in FIG. 3, the operator inserts the upper end of the display unit 103 into the guide rail 201 of the support structure unit 102. Next, the knob portion 203a of the fixing portion 203 is rotated along the rotation hole 204 with the fulcrum 203b as a fulcrum, and the display portion 103 is brought into close contact with the flat surface of the support structure portion 102 between the protrusions 202a and 202b. Then, as shown in FIG. 4, the fixing portion 203 returns to the position before the rotation due to the elasticity of the material, and fixes the display portion 103. In this way, the operator can display the display unit 1 with simple work.
03 can be fixed to the support structure 102. Further, the stopper 205 is fixed to the fixing portion 203.
The rotation of the fixed portion 203 and the support structure portion 102 can be prevented from being damaged.
Next, the case where a battery is attached to the support structure 102 will be described. In FIG.
Reference numeral 1 denotes a battery, and an operator inserts the battery 401 into the battery case 206 of the support structure 102 while pushing down the prevention structure 208. The drop-off prevention structure 208 is made of the same resin as that of the support structure portion 102, has elasticity, and bends in a direction that opens to the extent that the battery 401 can be inserted. FIG. 6A shows this state as a sectional view of the battery case 206 portion.
Shown in When the battery 401 is completely inserted into the battery case, the drop-off preventing structure 208 is restored by the elasticity of the material as shown in FIG. The drop-off prevention structure 208 has a claw-like structure 208a at its end to prevent the battery from falling off. On the other hand, the fall-off prevention structure 20
A battery 8 is pressed and fixed to the band 207 by the elasticity of the material. In this way, the battery 401 is fixed to the battery case 206 as shown in FIG. If this embodiment is used, it is possible to provide a battery case that prevents falling off by a single structure with the support structure 102 without requiring a separate structure such as a lid.
As described above, by using this embodiment, it is possible to provide an electronic watt-hour meter having a display unit fixing structure in which stress is not easily applied to the display unit 103 such as a liquid crystal display and the fixing operation is simple.

The internal block diagram which shows the internal structure of Example 1 of the electronic watt-hour meter by this invention The block diagram which shows the structure of the support structure concerning the electronic watt-hour meter by this invention The figure which shows the attachment state of the display part to the support structure concerning the electronic watt-hour meter by this invention (before attachment) The figure which shows the attachment state of the display part to the support structure concerning the electronic watt-hour meter by this invention (after attachment) The figure which shows the attachment state of the battery to the battery case of the support structure concerning the electronic watt-hour meter by this invention (before attachment) It is a battery case fragmentary sectional view which shows the attachment state of the battery to the battery case of the support structure concerning the electronic watt-hour meter by this invention, (a) shows before attachment, (b) shows after attachment. The figure which shows the attachment state of the battery to the battery case of the support structure concerning the electronic watt-hour meter by this invention (after attachment)

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Electronic electricity meter housing | casing 101 Circuit part 102 Support structure part 103 Display part 104 Name plate 105 Transparent window part 201 Guide rail 202a Projection part 202b Projection part 203 Fixing part 203a Knob part 203b Supporting part 203c Holder part 204 Turning hole 205 Stopper 206 Battery case 207 Band portion 208 Fall-off prevention structure 208a Claw-like structure 401 Battery

Claims (4)

An indicator,
A guide rail portion for pressing the end of the indicator;
An electronic watt-hour meter comprising support means including a rotatable fixing portion that sandwiches the other end of the display. The electronic watt-hour meter according to claim 1, wherein the support means includes a stopper that limits a rotation range of the fixed portion. The electronic watt-hour meter according to claim 1 or 2, wherein the fixing portion of the support means has a resin integrated structure. A drop-off prevention means that is engaged with the battery and has a claw portion having elasticity,
4. The electronic watt-hour meter according to claim 3, further comprising a battery housing part having a band part for sandwiching and fixing the battery together with the drop-off preventing means.

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