JP2018059765A - Housing case for housing electronic watthour meter and electronic watthour meter unit including housing case and electronic watthour meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a means for installing an electronic watt-hour meter in an existing mounting hole of a distribution board. SOLUTION: A storage case for accommodating an electronic watt-hour meter, the front cover, the side cover, and the back cover, which are configured to cover the front surface, the side surface, and the back surface of the electronic watt-hour meter, respectively. The side cover is provided with a tubular portion having a front opening and a back opening, and a mounting portion formed around the front opening, and is detachably attached to the mounted portion via the mounting portion. The front cover is removable and removable from the side cover, making the front of the electronic watt-hour meter partially visible when the watt-hour meter is placed inside the side cover. A storage case that has a window, the back cover can be detachably attached to the side cover, and has terminal receiving holes that can accept terminals connected to distribution lines. [Selection diagram] Fig. 1

Description

  The present invention relates to a housing case for housing an electronic watt-hour meter, and an electronic watt-hour meter unit including a housing case and an electronic watt-hour meter.

  The watt hour meter can be classified into a mechanical watt hour meter and an electronic watt hour meter with respect to its driving means. The mechanical watt-hour meter must accommodate a relatively large driving portion such as a rotor disk, a braking magnet, and a coil in a casing. Therefore, the overall dimensions of the mechanical watt-hour meter are necessarily increased.

  In recent years, a shift from a mechanical watt-hour meter to an electronic watt-hour meter is progressing with a demand for high measurement accuracy and multifunctional communication functions. Since the electronic watt hour meter does not require large parts like the mechanical watt hour meter, the electronic watt hour meter has a considerably smaller size than the mechanical watt hour meter.

  At present, many mechanical watt-hour meters are still used in commercial distribution boards used in various offices such as substations. A so-called embedded attachment method is used to attach the mechanical watt hour meter to the distribution board. Specifically, a through hole for attachment (in other words, an installation hole or an attachment hole) is formed in the door of the distribution board, and the mechanical watt hour meter is installed through this through hole. The mechanical watt-hour meter is installed in a state where the front side of the housing is exposed to the outside so that the display unit of the measured value is visually recognized, and the back side protrudes from the back side of the door toward the inside of the distribution board. All of the distribution lines connected to the watt hour meter extend from the back side of the housing into the distribution board.

  When used on the premise of fee trading or proof, watt-hour meters are required by the Measurement Act to require verification and are regularly replaced. For replacement, the mechanical watt-hour meter is inserted into and removed from the through hole of the door of the distribution board, together with the housing in which mechanical drive parts such as a rotor are accommodated. At that time, it is necessary to attach and detach the distribution lines on the back side of the watt-hour meter (that is, inside the distribution board). The operation of opening and closing the door of the distribution board is complicated. The space on the back side of the door is a narrow and limited space in which various devices inside the distribution board are arranged.

  As with residential watt-hour meters, there is a demand for a shift from mechanical type to electronic type for commercial watt-hour meters. However, as described above, the electronic watt-hour meter is significantly reduced in size as compared with the mechanical watt-hour meter. Therefore, it is difficult to use the existing mounting holes of the distribution board for installing the existing electronic watt-hour meter.

  One embodiment of the present invention aims to provide a means that makes it possible to install an electronic watt-hour meter in an existing mounting hole of a distribution board. An object of one embodiment of the present invention is to provide means for facilitating replacement work of an electronic watt-hour meter. One object of the present invention is to provide a means for enabling a smooth transition from a mechanical watt hour meter to an electronic watt hour meter.

  According to one embodiment of the present invention, a storage case for storing an electronic watt-hour meter, a front cover configured to cover the front, side, and back of the electronic watt-hour meter, and a side surface A cover and a back cover, and the side cover includes a cylindrical portion having a front opening and a back opening, and a mounting portion formed around the front opening, via the mounting portion. The front cover can be detachably attached to the side cover, and the front of the electronic watt-hour meter can be partly mounted when the electronic watt-hour meter is placed inside the side cover. A housing case having a window portion that can be visually recognized, and a back cover that can be detachably attached to the side cover and that has a terminal receiving hole that can receive a terminal connected to a distribution line Will be providedAccording to this structure, the existing electronic watt-hour meter can be installed in the existing mounting hole of a distribution board. In addition, since the operation of detaching the distribution line for exchanging the meter can be performed only from the front side of the electronic watt-hour meter, the meter exchanging operation can be easily performed.

  According to one embodiment of the present invention, the dimension of the cross section in the lateral direction of the cylindrical portion is set so that the cylindrical portion can be inserted into a through hole formed in the installation portion, It can be attached to the installation area around the through hole.

  According to an embodiment of the present invention, the side cover further includes a positioning member for positioning the electronic watt-hour meter within the housing case.

  According to one embodiment of the present invention, the fitting convex portion is provided on one outer peripheral portion of the front cover and the side cover, and the fitting convex portion can be received on the other outer peripheral portion of the front cover and the side cover. A fitting recess is provided.

  According to one embodiment of the present invention, there is provided an electronic watt-hour meter unit including the storage case described above and an electronic watt-hour meter stored in the storage case.

It is a disassembled perspective view which shows the storage case by one Embodiment of this invention with an electronic watt-hour meter. It is a front view of an electronic watt-hour meter. It is a figure which shows the inside of a side cover. It is a figure which shows the internal wiring of a storage case. It is a front perspective view of a storage case. It is a back perspective view of a storage case.

Embodiments of the present invention will be described below with reference to the accompanying drawings. In this specification, the directions such as “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “front”, “rear”, “front”, “rear”, etc. The term to show is used about the use condition in which the storage case was installed in the to-be-installed part.

[Overall outline of the storage case]
FIG. 1 is an exploded perspective view showing an accommodation case 10 according to an embodiment of the present invention together with an electronic watt-hour meter 100 accommodated in the accommodation case 10. The housing case 10 includes a front cover 1, a side cover 2, and a back cover 3 that are configured to cover the front, side, and back of the electronic watt-hour meter 100. The front cover 1 can be detachably attached to the side cover 2, and the back cover 3 can be detachably attached to the side cover 2. As an example, the front cover 1, the side cover 2, and the back cover 3 are made of resin.

[About electronic watt-hour meter]
FIG. 2 is a front view showing an example of the electronic watt-hour meter 100 housed in the housing case 10. A name plate 101 is attached to the front surface of the electronic watt-hour meter 100. The nameplate 101 is required to be attached to the watt hour meter according to the JIS standard, and predetermined description contents such as a meter name, a phase and a wire type, and a meter constant are written. The nameplate 101 is configured such that the measurement value display unit 102 of the electronic watt-hour meter 100 is visible through a transparent window (reference numeral omitted). In FIG. 2, reference numeral 103 denotes a mounting hole for receiving a fixing screw (not shown) for fixing the electronic watt-hour meter 100 in the housing case 10. Reference numeral 104 denotes a measurement terminal unit, and reference numeral 105 denotes a meter transmission and communication terminal unit. Reference numeral 106 denotes an instrument sealing screw, and reference numeral 107 denotes a sealing protrusion having a through hole for passing a sealing line (not shown). However, the configuration of the electronic watt-hour meter 100 housed in the housing case 10 is not limited to the illustrated example.

[About side cover]
Referring again to FIG. 1, the side cover 2 includes a cylindrical portion 23 having a front opening 21 and a rear opening 22, and a mounting portion 24 formed around the front opening 21. The cylindrical portion 23 has a transverse cross-sectional dimension so that it can be inserted into an existing mounting hole in the installation portion. An example of the configuration of the side cover 2 is clearly shown in FIG. The attachment portion 24 can have a flange shape extending from the front end of the tubular portion 23 in the circumferential direction and outward. The side cover 2 can be detachably attached to the front surface of the door of the distribution board as the installation part via the attachment part 24. A mounting hole 25 for receiving a mounting screw 110 (see FIG. 1) for mounting is formed in the mounting portion 24. The number and positions of the mounting holes 25 are not particularly limited, but when mounting using existing installation holes, the mounting holes 25 can be formed at positions that align with screw holes formed around the installation holes. Thereby, the side surface cover 2 is arrange | positioned so that the cylindrical part 23 may protrude in the back side of a door through the installation hole of the door of a distribution board, and is fixed to the front surface of a door by the attachment part 24. FIG. Reference numeral 26 denotes a screw hole for receiving a sealing screw 13 (see FIG. 1) for sealing the front cover 1.

  As will be described later, the side cover 2 and the front cover 1 are attached to each other by fitting in the front-rear direction. 28 is a convex portion (in other words, a fitting convex portion) formed on the outer peripheral portion of the mounting portion 24, and the convex portion 28 is a space (in other words, a space between the outer peripheral convex portions 15 of the front cover 1 described later. For example, it is configured to be received in the fitting recess). The convex portion 28 can be engaged with the outer peripheral convex portion 15, and can thereby function as a stop portion for preventing the positional deviation of the front cover 1 in the vertical and horizontal directions. In the present embodiment, four convex portions 28 are provided, and each convex portion 28 has a curved shape formed along the corner of the substantially rectangular mounting portion 24.

  The side cover 2 further includes a positioning member 27 for positioning the electronic watt-hour meter 100 in the housing case 10. In the example of FIG. 3, the positioning member 27 is disposed inside the cylindrical portion 23, and includes a base plate 27 a disposed on the back side of the electronic watt-hour meter 100 and a plurality of positioning protrusions fixed to the base plate 27 a. 27b. The base plate 27 a has a screw hole 27 c that receives a fixing screw for fixing the electronic watt-hour meter 100. The base plate 27 a has a plurality of cutouts 27 d, and each cutout 27 d is a lead wire connected to the measurement terminal portion 104 and the transmission and communication terminal portion 105 of the electronic watt-hour meter 100. An opening for guiding 200 is formed. For example, as shown in FIG. 4, the lead wire 200 is guided in the side cover 2 through a notch 27d. The lead wire 200 is connected to a distribution line (in other words, a lead-in wire from the distribution board) via a terminal 35 inserted into a terminal receiving hole 31 of the back cover 3 described later.

  The electronic watt-hour meter 100 is usually smaller than the mechanical watt-hour meter. Therefore, the existing small electronic watt-hour meter 100 can be easily positioned and fixed by the positioning protrusion 27b. Further, the notch 27d for guiding the lead wire 200 can easily connect the terminal portions 104 and 105 of the electronic watt-hour meter 100 and the lead wire 200.

  The number, shape, and position of the positioning protrusions 27b are not limited to those illustrated. Further, the positioning member 27 may be configured to be detachable from the cylindrical portion 23. In this case, for example, by preparing a plurality of positioning members 27 with different positioning protrusions 27b for a single side cover 2, the electronic watt-hour meter 100 having different dimensions can be obtained by simply replacing the positioning members 27. It can be easily handled.

[About front cover]
FIG. 5 is a front perspective view of the housing case 10 in which the electronic watt-hour meter 100 is housed and the side cover 2 is attached with the front cover 1 and the back cover 3. FIG. 6 is a rear perspective view of the housing case 10 of FIG.

  The front cover 1 has a convex portion 11 that generally matches the front shape of the electronic watt-hour meter 100, and the items described on the nameplate 101, the measured value display portion 102, and the instrument seal portions 106 and 107 are provided on the convex portion 11. Is visible. The window 12 may be an opening that directly exposes the nameplate 101 and the like to the outside, and a transparent member may be disposed in the opening. The front cover 1 further includes a sealing screw 13 and a sealing protrusion 14 having a through hole for passing a sealing line (not shown). The sealing screw 13 is inserted into the screw hole 26 described above.

  The front cover 1 has an outer peripheral wall (not shown) partially cut away, so that a plurality of (in this embodiment, four) outer peripheral convex portions (in other words, fitting convex portions) 15 are formed. Is formed. In the present embodiment, the outer peripheral convex portion 15 extends linearly along the side portion of the substantially rectangular front cover 1. The outer peripheral convex portion 15 is configured to be received in a space (in other words, a fitting concave portion) between the convex portions 28 formed on the outer peripheral portion of the attachment portion 24 of the side cover 2. The front cover 1 can be attached to the side cover 2 by fitting in the front-rear direction so that the outer peripheral protrusion 15 is received in the space between the protrusions 28. Since the convex portion 28 is positioned between the adjacent outer peripheral convex portions 15, positional deviation in the vertical and horizontal directions with respect to the side cover 2 of the front cover 1 is prevented. However, the method of attaching the front cover 1 to the side cover 2 is not limited to the above. Further, the numbers, shapes, and positions of the outer peripheral convex portions 15 and the convex portions 28 are not limited to those shown in the drawing.

[Back cover]
The configuration of the back cover 3 is clearly shown in FIG. The back cover 3 is detachably attached to the side cover 2 and includes a terminal receiving hole 31 that can receive a terminal 35 that can be connected to a lead-in wire from a distribution board (not shown). The terminal receiving hole 31 is formed in the back cover main body 32. Further, the back cover 3 has an outer peripheral wall 33 extending along the outer periphery of the back cover main body 32 and in the length direction of the housing case 10, so that the rear end portion of the side cover 2 can be received. Has been. Reference numeral 34 denotes a mounting hole for receiving a fixing screw for fixing the back cover 3 to the side cover 2. The attachment hole 34 is formed at a position aligned with a screw hole (not shown) formed in the wall portion of the cylindrical portion 23 of the side cover 2. However, the method of attaching the back cover 3 to the side cover 2 is not limited to the above.

  One end of each terminal 35 inserted into the terminal receiving hole 31 is connected to a distribution line inside the distribution board, and the other end is connected to the lead wire 200 of the housing case 10 (see FIG. 1). As shown in FIG. 4, the lead wire 200 is guided to the terminal portions 104 and 105 of the electronic watt-hour meter 100 by the notch 27d. The number of terminal receiving holes 31 is not particularly limited. In this example, only a part of the plurality of terminal receiving holes 31 is used, but the number of terminal receiving holes 31 used varies depending on the line type of the electronic watt-hour meter 100 or the like. Further, the arrangement of the terminal receiving holes 31 is not limited to the illustrated example.

[How to install the storage case]
As mentioned above, as with residential watt-hour meters, commercial watt-hour meters are also expected to shift from mechanical to electronic, but commercial mechanical watt-hour meters are Often installed in the door installation hole. On the other hand, the existing electronic watt-hour meter is remarkably miniaturized as compared with the mechanical watt-hour meter, and it is difficult to install it as it is in the existing installation hole.

  However, by using the housing case 10 having the above-described configuration, the electronic watt-hour meter 100 can be easily installed in the existing installation hole of the distribution board. Specifically, the cylindrical portion 23 of the side cover 2 is inserted into the existing installation hole, and the attachment portion 24 is brought into contact with the front surface of the door. Through the mounting hole 25 of the mounting portion 24, the mounting screw 110 is screwed into a screw hole formed around the installation hole on the front surface of the door. Thereby, the side cover 2 can be fixed to the door of the distribution board.

  Next, the back cover 3 can be fixed to the side cover 2. At this time, the lead-in wire from the distribution board and one end of the lead wire 200 are connected to both ends of the terminal 35 arranged in the terminal receiving hole 31, respectively. The side cover 2 is fitted inside the outer peripheral wall 33 of the back cover 3, and a fixing screw is screwed into the screw hole of the tubular portion 23 through the attachment hole 34. The other end of the lead wire 200 is pulled out to the front opening 21 side through the notch 27d of the positioning member 27 inside the cylindrical portion 23.

  Next, the electronic watt-hour meter 100 is inserted into the side cover 2. At this time, the electronic watt-hour meter 100 is guided to a predetermined mounting position on the base plate 27 a by the positioning protrusion 27 b of the positioning member 27. By screwing a fixing screw into the screw hole 27c, the electronic watt-hour meter 100 is fixed to the base plate 27a, and thus the side cover 2. Each lead wire 200 drawn out from the notch 27 d is connected to the terminal portions 104 and 105 of the electronic watt-hour meter 100.

  Next, the front cover 1 is fitted to the side cover 2 so that the outer peripheral convex portion 15 of the front cover 1 is located in the space between the convex portions 28 of the attachment portion 24. Positioning the convex portion 28 between the adjacent outer peripheral convex portions 15 prevents the positional deviation of the front cover 1 in the vertical and horizontal directions with respect to the side cover 2. The sealing screw 13 is screwed into the screw hole 26 of the side cover 2, and the sealing wire is inserted into a through hole formed in the sealing screw 13 and the sealing projection 14, whereby the front cover 1 is sealed. In the present embodiment, the sealing screw 13 also has a function of fixing the front cover 1 to the side cover 2.

  The fixing of the side cover 2 to the installation part, the fixing of the electronic watt-hour meter 100 to the side cover 2, and the fixing of the front cover 1 and the rear cover 3 to the side cover 2 are not necessarily performed according to the above procedure. May be. For example, the electronic watt-hour meter 100 may be fixed to the side cover 2 before the back cover 3 is fixed to the side cover 2, and fixed to the side cover 2 before the side cover 2 is fixed to the installation portion. May be.

[How to replace the instrument]
When the instrument needs to be replaced for verification or the like, the front cover 1 is unsealed and the front cover 1 is removed from the side cover 2. Then, the operation of detaching the distribution line is performed through the front opening 21 of the side cover 2. Specifically, the lead wire 200 can be removed from the terminal portions 104 and 105, the fixing screw can be loosened, and the electronic watt-hour meter 100 can be removed from the base plate 27a. Then, the new electronic watt-hour meter 100 is positioned on the base plate 27a by the positioning projection 27b and fixed by the fixing screw. After the lead wire 200 is connected to the terminal portions 104 and 105, the front cover 1 is attached to the side cover 2 again and sealed. Thus, according to the present embodiment, the instrument replacement work can be performed only from the front surface of the electronic watt-hour meter 100. Unlike conventional embedded mechanical watt-hour meters, it is not necessary to open the distribution board door and perform work from the back side of the door, so that the instrument can be easily replaced in a short time.

  In addition, the example of the to-be-installed part in which the storage case 10 is installed is not restricted to a distribution board. If it is a wall surface of various buildings and has a through hole for attachment, the housing case 10 can be attached.

  The present invention can be widely applied as means for attaching an electronic watt-hour meter.

DESCRIPTION OF SYMBOLS 1 Front cover 2 Side cover 3 Back cover 10 Storage case 11 Convex part 12 Window part 13 Sealing screw 14 Sealing protrusion 15 Outer peripheral convex part (fitting convex part)
21 Front opening 22 Back opening 23 Cylindrical part 24 Mounting part 25 Mounting hole 26 Screw hole 27 Positioning member 27a Base plate 27b Positioning protrusion 27c Screw hole 27d Notch 28 Convex part (fitting convex part)
31 Terminal receiving hole 32 Back cover body 33 Outer peripheral wall 34 Mounting hole 35 Terminal 100 Wattmeter 101 Name plate 102 Measurement value display part 103 Mounting hole 104 Measuring terminal part 105 Communication terminal part 106 Instrument sealing screw 107 Sealing protrusion 110 Mounting screw 200 Lead wire

Claims (5)

A housing case for housing an electronic energy meter,
A front cover configured to cover the front, side, and back of the electronic energy meter, a side cover, and a back cover,
The side cover includes a cylindrical part having a front opening and a rear opening, and an attachment part formed around the front opening, and can be detachably attached to the installation part via the attachment part. And
The front cover is detachably attachable to the side cover, and a window that allows the front of the electronic watt-hour meter to be partially visible when the electronic watt-hour meter is disposed in the side cover. Have
The back cover is detachably attachable to the side cover and includes a terminal receiving hole that can receive a terminal connected to a distribution line.
Containment case.   The dimensions of the cross section in the lateral direction of the cylindrical portion are set so that the cylindrical portion can be inserted into a through hole formed in the installation portion, and the mounting portion is formed around the through hole. The storage case according to claim 1, wherein the storage case is attachable to the installation portion.   The storage case according to claim 1, wherein the side cover further includes a positioning member for positioning the electronic watt-hour meter within the storage case.   A fitting convex portion is provided on one outer peripheral portion of the front cover and the side cover, and a fitting concave portion capable of receiving the fitting convex portion is provided on the other outer peripheral portion of the front cover and the side cover. The storage case according to any one of claims 1 to 3.   An electronic watt-hour meter unit comprising the housing case according to claim 1 and an electronic watt-hour meter housed in the housing case.

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