JP3946608B2 - Insulation case for electricity meter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an insulation case for a watt hour meter that is incorporated in a support provided at the base of a watt hour meter.
[0002]
[Prior art]
The watt hour meter measures the amount of electric power based on the input current and the input voltage, and includes a terminal block having a power supply terminal and a load terminal for inputting the current and voltage, a current, It has a board on which a CPU for calculating the amount of power based on the voltage is mounted, and a base on which this board is attached via a support.
[0003]
FIG. 7 shows a side view of a conventional electronic watt-hour meter (Non-Patent Document 1). FIG. 8 shows a front view of a base block assembly of a conventional electronic watt-hour meter (Non-Patent Document 1).
[0004]
The electronic watt-hour meter shown in FIGS. 7 and 8 has a terminal block 21 provided with terminals 22 such as a power supply terminal and a load terminal, and a base 8 made of a steel plate. Two supports 5 are provided. The support 5 has a portion other than both ends bent into a concave shape with respect to the reference surfaces 17 formed at both ends.
[0005]
Incorporation of the substrates 6A and 6B and the nameplate 9 into the support 5 thus configured is performed as follows. First, the substrate 6A is fastened and fixed to the support 5 by a post 16 made of brass, and the substrate 6B is arranged on the post 16 at a position higher than the reference surface 17, and the substrate 6B is fastened and fixed by the post 16. The nameplate 9 is attached with screws 7 on the post 16 and at a position higher than the reference surface 17. For this reason, the flatness of the reference surface 17 of the support 5 and the parallelism between the base 8 and the perpendicularity of the post mounting screw hole are required.
[0006]
[Non-Patent Document 1]
Type approval number 1121 from Nippon Electric Meters Laboratory (Structure and side view on page 3, base [17] on page 20, terminal box [19] on page 22)
[0007]
[Problems to be solved by the invention]
However, since the support 5 shown in FIGS. 7 and 8 is tapped with a pressed part, it is difficult to bring the flatness, parallelism, and squareness within the standard. If the flatness, parallelism, and perpendicularity do not fall within the standard, the assembly position dimensions of the post 16 are lost, the mounting holes of the boards 6A and 6B, and the mounting screw holes of the post 16 from the mounting holes of the nameplate 9. May be removed, and the boards 6A and 6B and the nameplate 9 may not be incorporated into the post 16. For this reason, the yield was poor, which was a factor in increasing costs.
[0008]
In addition, since the base 8, the support 5, the post 16 and the screw 7 are at the same potential after assembly, a component mounting prohibited area for securing an insulation distance is required from the post mounting position of the boards 6A and 6B. That is, since the post 16 is made of metal, for example, as an 8 kV lightning impulse countermeasure, it is necessary to secure an insulating distance of about 8 mm from the post mounting position of the boards 6A and 6B. For this reason, the component mounting area is reduced, and the conventional electronic watt-hour meter requires two substrates for mounting a predetermined number of electronic components. For this reason, the cost has been increased.
[0009]
The present invention eliminates the geometric dimension tolerance of the flatness, parallelism, and squareness of the support, and eliminates the component mounting prohibited area for securing the insulation distance, thereby reducing the watt hour meter. An object is to provide an insulation case for a watt-hour meter.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 is an insulation case for a watt hour meter incorporated in a support provided on a base of a watt hour meter, and is formed at the bottom of the insulation case and has a substrate. A board mounting claw for inserting the board into the insulating case through the hole, a rectangular first board mounting positioning portion and a plate shape for determining the mounting position of the board to be mounted on the insulating case by the board mounting claw The second substrate mounting positioning portion and one end of the side surface portion of the insulating case are formed in an inverted L shape, and the insulating case is slid along the L shape portion formed on the support. And a slide fixing part that fixes the support to the support.
[0011]
According to the insulation case for a watt-hour meter according to the first aspect of the present invention, since the insulation case is fixed to the support while sliding the insulation case along the L-shaped portion formed on the support, the plane of the support Eliminate geometric tolerances of degrees, parallelism, and squareness. Moreover, since the first and second board mounting positioning portions and the board mounting claws are provided in the insulating case, the board can be mounted with one touch without the need for fastening parts such as posts and screws for height positioning. Can be built into an insulating case. For this reason, the assembling work can be improved. In addition, it is possible to provide an insulation case for a watt hour meter that can be made as a single board by eliminating a component mounting prohibited area for securing an insulation distance and that can reduce the watt hour meter.
[0012]
WHM insulating case according to the invention of claim 2 is formed by providing a notch formed by cutting a side surface portion of the insulating case, is inserted into the hole with the nameplate attaching said faceplate to said insulating casing a nameplate engaging hooks for, characterized by having a a nameplate attachment positioning section that determines the upper end surface of the side portion of the mounting position of the faceplate that is attached to the insulating case the insulating case by the name plate attachment claws.
[0013]
According to the insulation case for the watt-hour meter according to the invention of claim 2, since the nameplate attachment positioning portion and the nameplate attachment claw are provided on the insulation case, a fastening part such as a post and a screw for positioning the height is provided. The nameplate can be incorporated into the insulation case with a single touch without the need. For this reason, the assembling work can be improved.
[0014]
An insulation case for a watt-hour meter according to a third aspect of the present invention is characterized in that it has a current transformer mounting portion that fits with a mounting claw of a current transformer and attaches the current transformer to the insulation case.
[0015]
According to the insulation case for a watt-hour meter according to the invention of claim 3, the current transformer is attached to the insulation case by fitting the current transformer attachment portion of the insulation case with the attachment claw of the current transformer. . For this reason, fastening parts such as screws are not necessary, and the current transformer can be attached to the insulating case with one touch. For this reason, the assembling work can be improved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of an insulation case for a watt hour meter according to the present invention will be described in detail with reference to the drawings.
[0017]
(First embodiment)
FIG. 1 is a perspective view of an insulation case for a watt hour meter according to the first embodiment. FIG. 2 is a perspective view of assembly of the watt-hour insulation case according to the first embodiment into the support and attachment of the board to the watt-hour insulation case. FIG. 3 is a front view of an electronic watt-hour meter having the watt-hour insulation case according to the first embodiment.
[0018]
An insulation case for watt hour meter (hereinafter referred to as an insulation case) 1 is incorporated in a support 5 provided on a base 8 of a watt hour meter, and has a bottom portion and a side portion, and an upper portion is open. It is made of a box-shaped insulator. The insulating case 1 is formed with substrate mounting claws 3 for attaching the substrate 6 to the insulating case 1 in the vicinity of the bottom four corners. The substrate 6 has square holes 6a at positions facing the substrate mounting claws 3. Is formed.
[0019]
The insulating case 1 is formed with two rectangular substrate mounting positioning portions 2a and one plate-shaped substrate mounting positioning portion 2b that determine the mounting position of the substrate 6 mounted on the insulating case 1. Further, a slide insertion portion 4 is formed at one end of the side surface portion of the insulating case 1. The slide insertion portion 4 has an inverted L shape, and the insulating case 1 is fixed to the support 5 by tightening the screws 7 while sliding the insulating case 1 along the L-shaped portion 5 a formed on the support 5. .
[0020]
The support 5 has an L-shaped portion 5a, and a hole 5b that is screwed into the screw 7 is formed in the L-shaped portion 5a.
[0021]
Next, the incorporation of the insulating case 1 into the support 5 and the attachment of the substrate 6 to the insulating case 1 will be described with reference to the perspective view shown in FIG.
[0022]
First, when the insulating case 1 is incorporated into the support 5, the slide insertion portion 4 of the insulating case 1 is slid and hooked on the L-shaped portion 5 a formed on the support 5. Then, the insulating case 1 is fixed to the support 5 by tightening the screw 7 through the insulating case 1 into the hole 5 b formed in the support 5. That is, since the dimensional error of the support 5 is absorbed by the slide insertion part 4 of the insulating case 1, the geometric dimension tolerance of the flatness, parallelism, and squareness of the support 5 can be eliminated. In addition, since the yield is improved, the cost can be reduced.
[0023]
Next, when attaching the substrate 6 to the insulating case 1, when the substrate 6 is inserted into the insulating case 1 from the opening of the insulating case 1, the square holes 6 a of the substrate 6 pass through the substrate attachment claws 3. The substrate 6 comes into contact with the tips of the substrate mounting positioning portions 2a and 2b and stops. At this time, the upper end of the substrate 6 is caught by the tip claw portion of the substrate mounting claw 3 to fix the substrate 6. That is, since the board mounting positioning portions 2a and 2b and the board mounting claws 3 are provided in the insulating case 1, the board 16 can be mounted with one touch without the need for fastening parts such as posts 16 and screws for height positioning. 6 can be incorporated into the insulating case 1. For this reason, the assembling work can be improved.
[0024]
Further, since the insulating case 1 made of an insulator is used, the component mounting prohibited area for securing the insulating distance of the substrate 6 can be eliminated, and the component mounting area is widened. Due to the widened component mounting area, the conventional electronic watt-hour meter requires two boards 6A and B, but the electronic watt-hour meter according to the first embodiment has one sheet. Only the substrate 6 is required.
[0025]
(Second embodiment)
Next, an insulation case for a watt hour meter according to a second embodiment of the present invention will be described. FIG. 4 is a perspective view of the nameplate attached to the watt-hour insulation case according to the second embodiment.
[0026]
In the insulating case 12 shown in FIG. 4, the insulating case 12 is assembled into the support 5, and the substrate 6 and the name plate 9 are attached to the insulating case 12. The insulating case 12 is assembled into the support 5, The mounting of the substrate to the insulating case 12 is the same as that shown in FIG. 1, so the description thereof is omitted here, and only the mounting of the nameplate to the insulating case 12 will be described.
[0027]
A nameplate attaching claw 11 for attaching the nameplate 9 to the insulating case 12 is formed on the side surface of the insulating case 12. The nameplate attachment claw 11 is formed by providing a cutout portion 11 a obtained by cutting out a side surface portion of the insulating case 12. A square hole 9 a is formed in the nameplate 9 at a position facing the nameplate attachment claw 11.
[0028]
Further, the upper end surface of the side surface portion of the insulating case 12 serves as a nameplate attachment positioning portion 10 that determines the attachment position of the nameplate 9 attached to the insulation case 12.
[0029]
Next, the assembly of the insulating case 12 into the support 5 and the attachment of the substrate 6 and the name plate 9 to the insulating case 1 will be described with reference to the perspective view shown in FIG. First, the insulating case 12 is incorporated into the support 5. For this reason, the geometric dimension tolerance of the flatness, parallelism, and squareness of the support 5 can be eliminated. In addition, since the yield is improved, the cost can be reduced.
[0030]
Next, after the substrate 6 is attached to the insulating case 12, the name plate 9 is brought into the opening of the insulating case 12, and the square hole 9a of the name plate 9 passes through the name plate attaching claw 11, and the name plate 9 Stops in contact with the mounting positioning portion 10. At this time, the name plate 9 is fixed by the upper end of the name plate 9 being caught by the front end claw portion of the name plate mounting claw 11. That is, since the nameplate attachment positioning portion 10 and the nameplate attachment claw 11 are provided on the insulating case 12, the nameplate 9 can be attached with one touch without the need for fastening parts such as posts 16 and screws for height positioning. It can be attached to the insulating case 12. For this reason, attachment work can be improved.
[0031]
(Third embodiment)
Next, an insulation case for an electric energy meter according to a third embodiment of the present invention will be described. FIG. 5 is a perspective view of the current transformer attached to the watt-hour insulation case according to the third embodiment. FIG. 6 is a diagram showing details of a current transformer mounting claw and a square hole formed in the watt-hour insulation case according to the third embodiment.
[0032]
The insulation case for watt hour meters according to the third embodiment is configured such that a current transformer is further attached to the insulation case for watt hour meters according to the second embodiment. A mounting claw 13 is formed in the current transformer 14 shown in FIG. Further, the insulating case 15 is formed with a square hole 19 for accommodating the current transformer 14 and a current transformer mounting portion 18 that engages with the mounting claw 13 formed on the current transformer 14.
[0033]
According to the electricity meter insulation case 15 according to the third embodiment configured as described above, the current transformer 14 is insulated after the insulation case 15 having the current transformer mounting portion 18 is incorporated in the support 5. The mounting claw 13 of the current transformer 14 is inserted into the square hole 19 of the case 15 and fitted into the current transformer mounting portion 18 of the insulating case 15. Thereafter, the substrate 6 or the substrate 6 and the name plate 9 are attached to the insulating case 15.
[0034]
As described above, according to the watt-hour insulation case 15 according to the third embodiment, since the support 5 is incorporated in the insulation case 15, the geometric dimension tolerance of flatness, parallelism, and perpendicularity of the support 5 is eliminated. be able to. Further, since the current transformer mounting portion 18 is provided in the insulating case 15, no fastening parts such as screws are required, and the current transformer 14 can be mounted on the insulating case 15 with one touch as with the board 6 and the nameplate 9. Can do. For this reason, the assembling work can be improved.
[0035]
【The invention's effect】
According to the present invention, it is possible to eliminate the geometric dimension tolerance of the flatness, parallelism, and squareness of the support. Moreover, since the first and second board mounting positioning portions and the board mounting claws are provided in the insulating case, the board can be mounted with one touch without the need for fastening parts such as posts and screws for height positioning. Can be built into an insulating case. For this reason, the assembling work can be improved. Moreover, the watt-hour meter can be made inexpensive by eliminating the component mounting prohibited area for securing the insulation distance.
[Brief description of the drawings]
FIG. 1 is a perspective view of an insulation case for a watt-hour meter according to a first embodiment.
FIG. 2 is a perspective view of assembling the wattmeter insulation case according to the first embodiment into the support and attaching the board to the wattmeter insulation case.
FIG. 3 is a front view of an electronic watt-hour meter having an watt-hour insulation case according to the first embodiment.
FIG. 4 is a perspective view of attaching a nameplate to an insulation case for a watt hour meter according to a second embodiment.
FIG. 5 is a perspective view of mounting a current transformer on an insulation case for a watt hour meter according to a third embodiment.
FIG. 6 is a diagram showing details of a current transformer mounting claw and a square hole formed in an insulation case for a watt hour meter according to a third embodiment.
FIG. 7 is a side view of a conventional electronic watt-hour meter.
FIG. 8 is a front view of a base block assembly of a conventional electronic watt-hour meter.
[Explanation of symbols]
1, 12, 15 Insulating cases 2a, 2b Board mounting positioning part 3 Board mounting claw 4 Slide insertion part 5 Support 6, 6A, 6B Board 6a, 9a, 19 Square hole 7 Screw 8 Base 9 Name plate 10 Name plate mounting positioning part 11 Brand Plate mounting claw 11a Notch 13 Mounting claw 14 Current transformer 16 Post 17 Reference surface 18 Current transformer mounting part

Claims (3)

An insulation case for a watt hour meter incorporated in a support provided at the base of the watt hour meter,
Wherein formed at the bottom of the insulation case, and the board mounting claw for by inserting into a hole having a substrate mounting the substrate to the insulating case,
A square-shaped first substrate mounting positioning portion and a plate-shaped second substrate mounting positioning portion that determine the mounting position of the substrate mounted on the insulating case by the substrate mounting claws ;
A slide fixing portion that is formed in an inverted L shape at one end of the side surface portion of the insulating case, and that fixes the insulating case to the support while sliding the insulating case along the L-shaped portion formed on the support. When,
An insulation case for a watt hour meter characterized by comprising: A nameplate attachment claw for attaching the nameplate to the insulation case by forming a notch formed by notching the side surface of the insulation case, and inserting the nameplate in the insulation case
A nameplate attachment positioning portion that determines the attachment position of the nameplate attached to the insulation case by the nameplate attachment claws at the upper end surface of the side surface portion of the insulation case ;
The insulation case for a watt-hour meter according to claim 1, comprising:   The insulation case for a wattmeter according to claim 1 or 2, further comprising a current transformer attachment portion that is fitted to an attachment claw of the current transformer and attaches the current transformer to the insulation case.

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