JP2015064264A - Watt-hour meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a watt-hour meter for cutting down material cost and exhibiting high reliability.SOLUTION: The watt-hour meter comprises: an instrument base, formed with a non-crystalline resin and having a base-side fitting part, which stores an instrument having a display part for measuring and displaying electric energy; an instrument cover covering the instrument base and having a cover-side fitting part at a position corresponding to the base-side fitting part of the instrument base, the instrument cover being formed with a non-crystalline resin having no glass material mixed in; a fitting screw for fitting the cover-side fitting part of the instrument cover to the base-side fitting part of the instrument base; and a cylindrical pressure dispersion medium provided at a penetration part of the fitting screw of the cover-side fitting part of the instrument cover and dispersing the screwing thrust of the fitting screw as uniform pressure.

Description

  The present invention relates to a watt hour meter that is installed outdoors, for example, inputs current and voltage, and measures the amount of power, and particularly relates to a mounting structure of a meter base and a meter cover in the watt hour meter.

  A conventional watt-hour meter includes a meter base that houses meters for inputting current and voltage and measures the amount of power, and a meter cover attached to the meter base. The mounting portion of the instrument cover is attached to the mounting portion of the meter base with a mounting screw.

  An example of the mounting structure of the instrument base and the instrument cover is as shown in FIG. The instrument base 1 is formed of an amorphous resin mixed with a glass material, for example, polycarbonate, and accommodates instruments for measuring electric power. An insertion hole 1b is formed in the base side mounting portion 1a of the instrument base 1, and a female screw fitting body 2 having a female screw formed on the inner peripheral surface side is fitted into the insertion hole 1b.

  The instrument cover 3 is formed of an amorphous resin mixed with a glass material, for example, polycarbonate, and the cover-side attachment surface 3b of the cover-side attachment part 3a of the instrument cover 3 is attached to the base side of the base-side attachment part 1a of the instrument base 1 It is attached in contact with the surface 1c. A through hole 3c through which the mounting screw 4 is passed is formed in the cover side mounting portion 3a of the instrument cover 3.

  The cover side mounting surface 3b of the cover side mounting portion 3a of the instrument cover 3 is brought into contact with the base side mounting surface 1c of the base side mounting portion 1a of the instrument base 1, and the mounting screw 4 is brought into contact with the cover side mounting portion 3a of the instrument cover 3. By passing the male screw portion 4a of the mounting screw 4 through the formed through hole 3c and screwing into the female screw of the female screw fitting body 2 fitted in the insertion hole 1b formed in the base side mounting portion 1a of the meter base 1, the instrument cover 3 is attached to the instrument base 1.

JP 2009-152466 A

  In the above-mentioned conventional watt-hour meter, the meter cover 3 is formed of polycarbonate, which is an amorphous resin mixed with a glass material to give strength, and the meter cover 3 is in a colored state and displays the amount of power. The portion corresponding to the display portion to be provided is provided with a display cover body by special welding using ultrasonic waves or the like, and there is a problem that it requires a great deal of labor and labor and is costly. Moreover, since the polycarbonate, which is a conventional amorphous resin, is blended with a glass material, the instrument cover 3 cannot be made transparent, and the unit cost of the polycarbonate, which is an amorphous resin, is high due to the high specific gravity of the glass material. There was a problem that the material cost has increased.

Further, as shown in FIG. 12, the conventional watt-hour meter abuts the cover-side mounting surface 3b of the cover-side mounting portion 3a of the instrument cover 3 on the base-side mounting surface 1c of the base-side mounting portion 1a of the meter base 1. However, warpage occurs in each molded product of the base-side mounting surface 1c and the cover-side mounting surface 3b, and the warpage affects the contact between the base-side mounting surface 1c and the cover-side mounting surface 3b. In the part, it was difficult to disperse the screw thrust of the mounting screw 4 as a uniform pressure. As described above, since the pressure is not uniform, there is a problem that a large pressure is applied to a certain place P, and cracking occurs in reliability evaluation (chemical resistance evaluation).
As an example of chemical resistance evaluation, the instrument cover 3 formed of polycarbonate, which is an amorphous resin, is installed in an atmosphere of an organic solvent such as a plasticizer (for example, phthalate ester) included in the coating of the wiring cable. When a tensile stress is applied to the instrument cover 3, a crazing phenomenon occurs. Crazing is a phenomenon in which white cracks or cracks occur when the instrument cover 3 is in contact with an organic solvent or under tensile stress in a gas atmosphere due to the occurrence of small cracks.

  The present invention has been made to solve the above-described problems, and its object is to reduce the cost of materials by forming an instrument cover with an amorphous resin that does not contain a glass material. In addition, the present invention provides a watt-hour meter that can disperse the screw thrust of the mounting screw as a uniform pressure by providing a cylindrical pressure dispersion body on the cover side mounting portion of the meter cover.

  The watt-hour meter according to the present invention is formed of an amorphous resin, has a base-side mounting portion, and covers a meter base that houses a meter having a display portion that measures and displays the power amount, and covers the meter base. And a cover side mounting portion at a position corresponding to the base side mounting portion of the meter base, a meter cover formed of an amorphous resin not blended with a glass material, and the cover side mounting portion of the meter cover. A mounting screw that is attached to the base side mounting portion of the instrument base, and a cylindrical shape that is provided in a through portion of the mounting screw of the cover side mounting portion of the instrument cover and that distributes the screw thrust of the mounting screw as a uniform pressure. And a pressure dispersion.

  According to the watt-hour meter according to the present invention, it is possible to reduce the material cost by forming the instrument cover with an amorphous resin not blended with a glass material, and at the cover side mounting portion of the instrument cover. A highly reliable watt-hour meter that can disperse the screw thrust of the mounting screw as a uniform pressure by providing a cylindrical pressure dispersion body can be obtained.

It is a perspective view which shows the state which installed the meter cover in the watt-hour meter concerning Embodiment 1 of this invention in the meter base. It is a perspective view which shows the state which installed the meter cover in the watt-hour meter concerning Embodiment 1 of this invention in the meter base. It is a perspective view which shows the state which shifted the meter cover in the watt-hour meter concerning Embodiment 1 of this invention from the meter base. FIG. 3 is a perspective view showing a state in which a meter cover in the watt-hour meter according to Embodiment 1 of the present invention is displaced from the meter base. FIG. 3 is a perspective view showing an instrument cover in the watt-hour meter according to Embodiment 1 of the present invention. It is a perspective view which shows the principal part of the meter cover in the watt-hour meter concerning Embodiment 1 of this invention. It is a perspective view which shows the meter base in the watt-hour meter concerning Embodiment 1 of this invention. It is a perspective view which shows the meter base in the watt-hour meter concerning Embodiment 1 of this invention. FIG. 3 is a schematic perspective view showing an attachment portion of an instrument base and an instrument cover in the watt-hour meter according to Embodiment 1 of the present invention. FIG. 3 is a cross-sectional view showing how the meter base and the meter cover are attached in the watt-hour meter according to Embodiment 1 of the present invention. FIG. 3 is a cross-sectional view showing the main parts of the attached state of the meter base and the meter cover in the watt hour meter according to Embodiment 1 of the present invention. It is sectional drawing which shows the attachment state of the meter base and meter cover in the conventional watt-hour meter.

Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 11. In each drawing, the same or equivalent members and parts will be described with the same reference numerals. FIG. 1 is a perspective view showing a state in which a meter cover in the watt hour meter according to Embodiment 1 of the present invention is installed on a meter base. FIG. 2 is a perspective view showing a state in which a meter cover in the watt hour meter according to Embodiment 1 of the present invention is installed on the meter base. FIG. 3 is a perspective view showing a state in which the instrument cover in the watt hour meter according to the first embodiment of the present invention is displaced from the instrument base. FIG. 4 is a perspective view showing a state in which the instrument cover in the watt hour meter according to the first embodiment of the present invention is displaced from the instrument base. FIG. 5 is a perspective view showing an instrument cover in the watt-hour meter according to Embodiment 1 of the present invention. FIG. 6 is a perspective view showing the main part of the meter cover in the watt-hour meter according to Embodiment 1 of the present invention. FIG. 7 is a perspective view showing a meter base in the watt-hour meter according to Embodiment 1 of the present invention. FIG. 8 is a perspective view showing a meter base in the watt-hour meter according to Embodiment 1 of the present invention. FIG. 9 is a schematic perspective view showing an attachment portion of an instrument base and an instrument cover in the watt-hour meter according to Embodiment 1 of the present invention. FIG. 10 is a cross-sectional view showing how the meter base and the meter cover are attached in the watt-hour meter according to Embodiment 1 of the present invention. FIG. 11 is a cross-sectional view showing the main parts of the meter base and the instrument cover in the watt-hour meter according to Embodiment 1 of the present invention.

  In each of these figures, 100 is a watt hour meter and is configured as follows. Reference numeral 101 denotes an instrument base which is formed of a non-crystalline resin such as polycarbonate, and stores instruments having a display unit for measuring and displaying the amount of electric power, and has a configuration as shown in FIGS. . 102 is a back surface portion of the instrument base 101, 103 is a base side mounting portion, 104 is provided in the base side mounting portion 103, an insertion hole through which the mounting screw 301 is inserted, and 105 is a base side portion of the meter base 101, which will be described later. Opposite to the cover side 205 of the instrument cover 201. Reference numeral 106 denotes a base abutting surface 106 of the instrument base 101, which abuts on a cover abutting surface 206 of an instrument cover 201 described later. 107 is formed in the base side mounting portion 103 of the instrument base 101 so as to communicate with the insertion hole 104, and a nut insertion portion into which the nut 302 is inserted, and 108 is the other side where the base side mounting portion 103 of the instrument base 101 is not provided. This is a base-side engagement body that is provided on the base side portion 105 side and has, for example, a square opening. 109 is a discharge portion formed by, for example, a notch formed on the lower side of the base-side mounting portion 103 of the instrument base 101. When rainwater enters the instrument base 101 with the instrument cover 201 to be described later attached thereto, The rainwater is discharged.

  201 is an instrument cover formed of, for example, polycarbonate which is a non-crystalline resin that does not mix the glass material covering the instrument base 101. Since this instrument cover 201 does not include a glass material, it is configured as a transparent body, for example. The display unit displaying the power amount of the meter base 101 is visible, and the power amount can be confirmed. The instrument cover 201 is configured as shown in FIGS. 202 is a front portion of the instrument cover 201, 203 is a cover side attachment portion provided at a position corresponding to the base side attachment portion 103 of the instrument base 101, and 204 is an attachment screw 301 formed on the cover side attachment portion 203 of the instrument cover 201. Is a through-hole through which 205 is inserted, 205 is a cover side portion disposed opposite to the base side portion 105 of the instrument base 101 with a slight gap, and 206 is a cover contact that abuts the base contact surface 106 of the instrument base 101. A contact surface 207 is a cover-side engagement body formed in a shape that engages with, for example, a square opening of the base-side engagement body 108 of the instrument base 101. For example, an engagement piece 207a is provided to provide an elastic function. Yes. 208 is provided in a through hole 204 formed in the cover side mounting portion 203 of the instrument cover 201, and has a through hole 208a having the same inner diameter as the through hole 204, and disperses the screw thrust of the mounting screw 301 as a uniform pressure. For example, it is a cylindrical pressure dispersion body formed in a cylindrical shape. A contact surface 208 b of the cylindrical pressure dispersion member 208 formed in a cylindrical shape contacts the base side mounting portion 103 of the instrument base 101. The cover-side engagement body 207 and the cylindrical pressure dispersion body 208 are integrally formed with the instrument cover 201 as a transparent body, for example, a polycarbonate, which is the same material as the instrument cover 201, that is, a non-crystalline resin containing no glass material. Has been configured.

  Next, how to attach the instrument cover 201 to the instrument base 101 will be described. First, the cover abutting surface 206 of the instrument cover 201 is brought into contact with the base abutting surface 106 of the instrument base 101, and the instrument cover 201 is slid and moved to the state shown in FIGS. When the instrument cover 201 is further slid and moved from this state, as shown in FIGS. 1 and 2, the cover-side engagement body 207 of the instrument cover 201 becomes, for example, a rectangular opening of the base-side engagement body 108 of the instrument base 101. The position of the instrument cover 201 is held by the elastic function of the engagement piece 207a of the cover-side engagement body 207 of the instrument cover 201. When the cover-side engagement body 207 of the instrument cover 201 is engaged with the base-side engagement body 108 of the instrument base 101, the gap between the opposing surfaces of the base side portion 105 of the instrument base 101 and the cover side portion 205 of the instrument cover 201 is reduced. The position of the through hole 204 formed in the cover side mounting portion 203 of the instrument cover 201 and the insertion hole 104 provided in the base side mounting portion 103 of the instrument base 101 are concentrically arranged with a slight gap. Positioned. Note that a slight gap is provided between the opposing surfaces of the base side portion 105 of the meter base 101 and the cover side portion 205 of the meter cover 201 because the base contact surface 106 of the meter base 101 and the meter cover 201 This is to prevent entry into the instrument base 101 due to, for example, a capillary phenomenon from between the cover abutting surface 206.

  After the cover side engaging body 207 of the instrument cover 201 is engaged with the base side engaging body 108 of the instrument base 101, the mounting screw 301 is attached to the cover side mounting portion 203 of the instrument cover 201 as shown in FIGS. 9 to 11. The formed through hole 204, the through hole 208 a of the cylindrical pressure dispersion body 208, and the insertion hole 104 provided in the base side mounting portion 103 of the instrument base 101 are inserted, and the male screw 301 a of the mounting screw 301 is inserted into the base side of the instrument base 101. The instrument cover 201 is attached to the instrument base 101 by being screwed into a nut 302 inserted into a nut insertion part 107 formed so as to communicate with the insertion hole 104 in the attachment part 103.

  As shown in FIGS. 10 and 11, the contact surface 208 b of the cylindrical pressure dispersion member 208 is in contact with the base side mounting surface 103 a of the base side mounting portion 103 of the instrument base 101, so that the screw thrust of the mounting screw 301 Is distributed as uniform pressure in the cylindrical pressure dispersion body 208 as indicated by the arrows, and a highly reliable watt-hour meter having no phenomenon of cracking in the cover side mounting portion 203 of the instrument cover 201 is obtained. Can do.

  In addition, the instrument cover 201 is not a high specific gravity material such as polycarbonate, which is a non-crystalline resin blended with the above-described conventional glass material, but is a non-crystalline resin not blended with a glass material, such as polycarbonate. Since it is formed, a material having a remarkably small specific gravity can be obtained, and the material cost can be reduced.

  In addition, the instrument cover 201 is a non-crystalline resin that does not contain a glass material, for example, by making it transparent with polycarbonate, the display unit that displays the amount of power of the meter base 101 can be seen and the amount of power can be confirmed. Since there is no need to provide a display cover body for displaying the amount of electric power as in the conventional colored instrument cover 3 described above, cost reduction can be achieved without requiring much labor and labor.

  The base side engaging body 108 of the instrument base 101 has a square opening, and the cover side engaging body 207 of the instrument cover 201 is engaged with the square opening of the base side engaging body 108 of the instrument base 101. However, the present invention is not limited to this. The cover side engaging body 207 of the instrument cover 201 has a square opening, and the base side engaging body 108 of the instrument base 101 is connected to the instrument cover 201. The cover side engaging body 207 may be formed in a shape that engages with the square opening, and the same effects as those of the above-described embodiment can be obtained.

  Further, the base-side mounting portion 103 of the instrument base 101 is provided on one side of the instrument base 101, and the cover-side mounting portion 203 of the instrument cover 201 and the cylindrical pressure dispersion 208 are also provided on one side of the instrument cover 201. The case where the base side engagement body 108 is provided on the other side of the base 101 and the cover side engagement body 207 that engages with the base side engagement body 108 is provided on the other side of the instrument cover 201 has been described. Instead, the base-side mounting portion 103 may be provided on the other side of the instrument base 101, and the cover-side mounting portion 203 and the cylindrical pressure dispersion member 208 may be provided on the other side of the instrument cover 201. The same effect as that of the embodiment is produced.

  By the way, the instrument cover 201 is a non-crystalline resin that does not contain a glass material. For example, it is not limited to this, but the instrument cover 201 does not contain a glass material. If it is a crystalline resin such as polycarbonate, the same effect can be obtained even if it is not necessarily a transparent body. The instrument cover 201 is an amorphous resin that does not contain a glass material. For example, polycarbonate can be an opaque body. In this case, the portion corresponding to the display unit that displays the amount of power is composed of the glass material as described above. It is not a high-strength polycarbonate that is a non-crystalline resin, but is a polycarbonate that is a non-crystalline resin that does not contain glass, and can be removed by relatively simple processing, reducing the cost of materials. Can be planned.

  It should be noted that within the scope of the present invention, the embodiments can be freely combined, or the embodiments can be appropriately modified or omitted.

  The present invention can reduce the material cost and is suitable for realizing a highly reliable watt-hour meter.

  100 watt hour meter, 101 meter base, 103 base side mounting portion, 104 insertion hole, 107 nut insertion portion, 108 base side engagement body, 201 instrument cover, 203 cover side mounting portion, 204 through hole, 207 cover side engagement body, 208 Cylindrical pressure dispersion, 301 mounting screw, 302 nut.

Claims (7)

  An instrument base that is formed of an amorphous resin, has a base-side mounting portion, and houses a meter having a display unit that measures and displays the amount of power, and covers the meter base and the base-side mounting of the meter base An instrument cover having a cover-side attachment portion at a position corresponding to the portion and formed of an amorphous resin that does not contain glass material, and the cover-side attachment portion of the instrument cover is the base-side attachment portion of the instrument base. And a cylindrical pressure dispersion member that is provided in a through portion of the attachment screw of the cover side attachment portion of the instrument cover and disperses the screw thrust of the attachment screw as a uniform pressure. A watt hour meter.   The watt-hour meter according to claim 1, wherein the cylindrical pressure dispersion body is formed in a cylindrical shape.   The base-side attachment portion of the instrument base is provided on one side of the instrument base, the cover-side attachment portion of the instrument cover is also provided on one side of the instrument cover, and a base side engagement is provided on the other side of the instrument base. The watt-hour meter according to claim 1 or 2, wherein a coalescence is provided, and a cover-side engagement body that engages with the base-side engagement body is provided on the other side of the instrument cover.   The said base side engaging body has a square-shaped opening part, The said cover side engaging body was formed in the shape engaged with the said square-shaped opening part of the said base side engaging body, The Claim 3 characterized by the above-mentioned. Watt hour meter.   An insertion hole through which the mounting screw is inserted is provided in the base side mounting portion of the instrument base, a nut insertion portion communicating with the insertion hole is formed, a nut is inserted into the nut insertion portion, and the mounting screw is inserted into the nut The watt hour meter according to any one of claims 1 to 4, wherein the watt hour meter is screwed onto the watt hour meter.   The watt-hour meter according to any one of claims 1 to 5, wherein the instrument cover is formed of polycarbonate which is an amorphous resin not containing a glass material.   The watt-hour meter according to claim 6, wherein the instrument cover formed of the polycarbonate is a transparent body.