JP2018128272A - Watthour meter attachment structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent abnormality in measuring function or the like caused by a temperature rise even when a watthour meter is used for a long time in an overload state exceeding a rated current.SOLUTION: An attachment structure of a watthour meter is to attach the watthour meter having a resin base 12 and a resin cover 13 attached on the front face of the base 12 on an attachment plate 16 attached on a wall surface of a structure of a power consumer. A metal plate 21 contacting the back face of the base 12 is interposed between the base 12 and the attachment plate 16.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a watt-hour meter mounting structure that measures and displays the amount of power used by a power consumer such as a general household or factory.

  Generally, there is an electronic watt-hour meter as disclosed in Patent Document 1 as a watt-hour meter that measures and displays the amount of power used by a power consumer.

  As shown in FIG. 14, this type of watt-hour meter measures the amount of power used by a power consumer and displays a base 2 on which a main body 1 for displaying the amount of power is mounted, and is attached to the front surface of the base 2. And a cover 4 formed of the cover 3.

  In the lower part of the base 2, a terminal part 5 having a power supply side terminal to which a distribution line from the power supply facility is connected and a load side terminal to which a distribution line to a load in the power consumer is connected is provided. . Further, on the front surface of the cover 3, the power amount display in the main body 1 can be visually observed.

  Conventionally, the watt-hour meter having the above-described configuration is attached to a mounting plate 6 provided on a structure of an electric power consumer, for example, a wall surface (not shown) of a building in the following manner.

  As shown in FIG. 15, the locking portion 8 of the base 2 is hooked on the locking screw 7 of the mounting plate 6, and the two sides of the terminal portion 5 of the base 1 are fixed to the mounting plate 6 with fixing screws 9. . Then, as shown in FIG. 16, by sliding the cover 3 from above the base 2, the cover 3 is fitted into the base 2 and fixed.

JP 2006-170787 A

  By the way, in recent years, in the watt-hour meter described above, a housing 4 made of a resin such as plastic is being adopted as the casing 4 including the base 2 and the cover 3. On the other hand, this type of watt-hour meter is generally used below the rated current, but depending on the power consumer, it may be used in a state exceeding the rated current.

  Thus, when the watt-hour meter is used for a long time in an overload state exceeding the rated current, the watt-hour meter itself becomes high temperature due to heat generation of the components of the watt-hour meter, particularly the energized portion. As a result, there is a possibility that the weighing function or the like may become abnormal, and it may cause a fire due to this.

  Therefore, the present invention has been proposed in view of the above-described problems, and the object of the present invention is to prevent abnormalities such as a measuring function due to a temperature rise even when used for a long time in an overload state exceeding the rated current. It is an object of the present invention to provide a watt-hour meter mounting structure that can be prevented.

  The present invention is an attachment structure in which a watt hour meter including a resin base and a resin cover attached to the front surface of the base is installed in a structure of a power consumer.

  As a technical means for achieving the above-mentioned object, the present invention is characterized in that a metal heat dissipating member that contacts the back surface of the base is interposed between the base and the structure. A metal plate is effective as the heat radiating member.

  In the present invention, by disposing a heat dissipating member in contact with the back surface of the base between the base and the structure, even if the watt hour meter is used for a long time in an overload state exceeding the rated current, the usage period The heat generated in the watt-hour components is transferred to the heat radiating member via the base and released to the outside from the heat radiating member. It is possible to suppress the watt-hour meter itself from being heated to a high temperature by the heat dissipating action by the heat conduction of the heat dissipating member.

  The heat dissipation member in the present invention preferably has a structure integrated with the base.

  By adopting such a structure, when a watt hour meter is newly installed in the structure, a heat radiating member can be attached in advance to the base, and workability can be improved in the watt hour meter installation work.

  The heat dissipating member in the present invention preferably has a structure having a slit so that it can be inserted between the base and the structure.

  If such a structure is adopted, it is only necessary to insert a heat radiating member between the base of the watt hour meter and the structure by using a slit with respect to the existing watt hour meter installed in the structure. It can be assembled.

  The heat dissipating member in the present invention preferably has a structure integrally having bent portions located on the left and right sides of the watt-hour meter.

  By adopting such a structure, the surface area of the heat radiating member can be increased by the bent portion, so that the heat radiating member is further exposed to the outside. Therefore, the heat dissipation effect by the heat conduction of the heat dissipation member can be further exhibited. As a result, it is possible to further suppress the watt-hour meter from becoming hot when the watt-hour meter is used for a long time in an overload state.

  According to the present invention, even when the watt-hour meter is used for a long time in an overload state exceeding the rated current, the heat generated in the watt-hour component during the usage period is transferred to the heat radiating member via the base. From the heat dissipation member. It is possible to suppress the watt-hour meter itself from being heated to a high temperature by the heat dissipating action by the heat conduction of the heat dissipating member.

  As a result, an abnormality such as a metering function due to a temperature rise and a fire can be prevented in advance, and a highly reliable and safe watt-hour meter can be provided.

In embodiment of this invention, it is a perspective view which shows the state which attached the metal plate to the newly installed watt-hour meter. It is a perspective view which shows the state which attaches a metal plate to the attachment plate of FIG. It is a perspective view which shows the state which attaches a base to the attachment board of FIG. It is a perspective view which shows the state which attaches a cover to the base of FIG. It is a perspective view which shows the state before integrating a metal plate with a base. It is a perspective view which shows the state after integrating a metal plate with a base. In other embodiment of this invention, it is a perspective view which shows the state which attached the metal plate to the existing watt-hour meter. It is a perspective view which shows the state which removes the cover of FIG. 7 from a base. It is a perspective view which shows the state which inserts a metal plate between the base and attachment plate of FIG. It is a perspective view which shows the state which attaches a cover to the base of FIG. It is a perspective view which shows the modification of the metal plate used in FIG. It is a perspective view which shows the modification of the metal plate used in FIG. It is a perspective view which shows the modification of the metal plate used in FIG. It is a perspective view which shows the attachment structure of the conventional watt-hour meter. It is a perspective view which shows the state which attaches a base to the attachment board of FIG. It is a perspective view which shows the state which attaches a cover to the base of FIG.

  Embodiments of the watt-hour mounting structure according to the present invention will be described below in detail with reference to the drawings. In this embodiment, an electronic watt-hour meter that measures and displays the amount of power used by a power consumer such as a general household or factory is exemplified.

  As shown in FIG. 1, the watt-hour meter of this embodiment measures the amount of electric power used by electric power consumers and displays the amount of electric power. A housing 14 including a plastic cover 13 made of plastic or the like attached to the front surface of the base 12 is provided.

  On the upper part of the base 12, a wiring board to which the main body 11 is electrically connected is mounted. Moreover, the terminal part 15 which has the power supply side terminal to which the distribution line from power supply equipment is connected and the load side terminal to which the distribution line to the load in an electric power consumer is connected is provided in the lower part of the base 12. ing.

  The cover 13 covers the main body portion 11 and the terminal portion 15 mounted on the base 12. On the front surface of the cover 13, the power amount display on the main body 11 can be visually confirmed. The cover 13 can be attached to the base 12 by sliding the cover 13 from above.

  The watt-hour meter having the resin casing 14 having the above configuration is installed in a structure of a power consumer. Specifically, a watt hour meter is attached to a mounting plate 16 (see FIG. 1) as a structure fixed to a wall surface (not shown) of a building such as a general home or factory.

  This type of watt-hour meter is generally used below the rated current, but may be used in a state where the rated current is exceeded depending on the power consumer. Thus, when the watt-hour meter is used for a long time in an overload state exceeding the rated current, the watt-hour meter itself becomes high temperature due to heat generation of the watt-hour components.

  Therefore, the watt-hour meter of this embodiment is installed on the mounting plate 16 with the following mounting structure. That is, as shown in FIG. 1, a metal plate 21 as a heat radiating member that contacts the back surface of the base 12 is interposed between the base 12 and the mounting plate 16. The metal plate 21 has a substantially rectangular shape having an area slightly larger than the base 12 in consideration of heat dissipation.

  However, the lower end edge of the metal plate 21 does not protrude downward from the terminal portion 15 of the watt-hour meter. In this way, the lower end edge of the metal plate 21 does not protrude downward from the terminal portion 15, so that the distribution wire is mistakenly attached to the metal plate 21 during the operation of connecting the distribution wire to the terminal portion 15 of the watt hour meter. In order to ensure safety by preventing short circuit accidents.

  For example, the metal plate 21 is preferably made of aluminum having a high thermal conductivity, but may be made of other metal or a material other than metal as long as the material has good thermal conductivity. Moreover, in this embodiment, although a plate-shaped thing is illustrated as a heat radiating member, a sheet-like thing may be sufficient.

  Thus, by adopting the mounting structure in which the metal plate 21 having good thermal conductivity is brought into contact with the back surface of the base 12 of the watt hour meter, the watt hour meter is used for a long time in an overload state exceeding the rated current. Even in this case, during the period of use, the heat generated in the components of the watt-hour meter is transmitted to the metal plate 21 through the base 12 and released from the metal plate 21 to the outside.

  It is possible to suppress the watt hour meter itself from being heated to a high temperature by the heat radiation effect due to the heat conduction of the metal plate 21. As a result, it is possible to prevent an abnormality such as a weighing function due to a temperature rise and a fire. In this way, a highly reliable and safe watt-hour meter can be installed in a power consumer.

  The case where the metal plate 21 (see FIG. 1) described above is attached to a new watt hour meter and the case where the metal plate 31 (see FIG. 5) is attached to an existing watt hour meter will be described in detail below.

  The metal plate 31 is in contact with the back surface of the base 12 and is interposed between the base 12 and the mounting plate 16 in the same manner as the metal plate 21 described above. Demonstrate the ability to suppress becoming.

  FIG. 1 shows an attachment structure in which a metal plate 21 is interposed between a base 12 and an attachment plate 16 in a watt hour meter newly attached to the attachment plate 16.

  As shown in FIG. 2, the metal plate 21 used when a watt-hour meter is newly attached to the attachment plate 16 has a locking hole for hooking on the locking screw 17 of the mounting plate 16 at the upper central portion. 22 and a fixing hole 23 for screwing to the mounting plate 16 at both lower side portions.

  As shown in FIG. 2, the locking hole 22 of the metal plate 21 is hooked on the locking screw 17 of the mounting plate 16. Then, as shown in FIG. 3, the locking portion 18 of the wattmeter base 12 is hooked on the locking screw 17 of the mounting plate 16.

  After that, the two places on both sides of the terminal portion 15 of the base 12 are fastened to the mounting plate 16 with the fixing screws 19 through the fixing holes 23 of the metal plate 21. Finally, as shown in FIG. 4, by sliding the cover 13 from above the base 12, the cover 13 is fitted into the base 12 and fixed.

  In addition, when attaching the metal plate 21 to a newly installed watt hour meter, the metal plate 21 and the watt hour meter are separately attached to the attachment plate 16 as described above. On the other hand, it is also possible to use a metal plate 41 as shown in FIGS. In addition, the enlarged view in FIG. 6 shows the partial cross section of X part and Y part.

  As shown in FIGS. 5 and 6, a metal plate 41 is previously attached to the base 12 of the watt hour meter, and the watt hour meter integrated with the metal plate 41 is installed on the attachment plate 16 (see FIG. 2). It may be. Thus, if the metal plate 41 is attached to the base 12 in advance, workability can be improved when the watt hour meter is installed on the attachment plate 16.

  In this case, as shown in FIG. 5, the metal plate 41 has a fixing hole 43 for engaging with a convex fixing protrusion 42 (stopper) provided on the base 12 of the watt hour meter at a substantially central portion thereof. And a tongue-like fixing claw 45 for insertion into a fixing groove 44 provided in the base 12 of the watt-hour meter at a plurality of parts (for example, four places) on the top, bottom, left and right.

  When the metal plate 41 is assembled to the base 12 of the watt hour meter, the fixing claws 45 of the metal plate 41 are inserted into the fixing grooves 44 of the base 12 from obliquely upward on the back side of the base 12. As shown in FIG. 6, when the insertion of the fixing claw 45 into the fixing groove 44 is completed, the fixing protrusion 42 of the base 12 is fitted into the fixing hole 43 of the metal plate 41 and locked (FIG. 6). 6), the fixing of the metal plate 41 to the base 12 is completed, and the metal plate 41 is integrated with the base 12.

  The fixing claw 45 of the metal plate 41 has a shape that extends downward while protruding toward the base 12 by cutting and raising so that the above-described assembly is possible (see FIG. 5). On the other hand, the fixing groove 44 of the base 12 has a shape that extends downward within a recess opened in the back surface of the base 12 (see an enlarged view of the Y portion in FIG. 6).

  In addition, a notch 46 is provided in the upper central portion of the metal plate 41. By providing such a notch 46, when the watt hour meter in which the metal plate 41 is integrated is installed on the mounting plate 16, the locking portion 18 of the base 12 is used as the locking screw 17 of the mounting plate 16. It becomes easy to hook (see FIG. 3).

  Furthermore, fixing slits 47 are provided on both lower side portions of the metal plate 41. The fixing slit 47 opens at the lower end edge of the metal plate 41 and extends to the insertion portion 50 of the fixing screw 19 (see FIG. 3). An opening portion of the fixing slit 47 is provided with a taper portion 48 that expands to facilitate the fitting of the fixing screw 19 to the insertion portion 50.

  A U-shaped slit 49 is formed in the vicinity of the fixing hole 43 of the metal plate 41. Thereby, the land portion 51 (the portion where the fixing hole 43 is formed) located inside the slit 49 can be elastically deformed.

  As a result, when the metal plate 41 is unnecessary, the land portion 51 is slightly elastically deformed to disengage the fixing hole 43 of the metal plate 41 from the fixing projection 42 of the base 12, thereby fixing the fixing projection 42 and the fixing projection 42. The engaged state with the hole 43 can be released. In this way, the metal plate 41 can be detached from the base 12 by a one-touch method.

  Next, FIG. 7 shows an attachment structure in which a metal plate 31 is interposed between the base 12 and the attachment plate 16 in an existing watt-hour meter attached to the attachment plate 16.

  As shown in FIG. 9, the metal plate 31 used when the watt-hour meter is already attached to the attachment plate 16 has a locking slit 32 extending in the vertical direction at the center, and the vertical direction at both lower side portions. And a fixing slit 33 extending in the direction.

  The locking slit 32 opens at the lower end edge of the metal plate 31 and extends to a position corresponding to the locking screw 17 of the mounting plate 16. The fixing slit 33 opens at the lower end edge of the metal plate 31 and extends to a position corresponding to the fixing screw 19. The opening portions of the locking slit 32 and the fixing slit 33 are provided with taper portions 34 and 35 that expand to facilitate the insertion of the mounting plate 16 into the locking screw 17 and the fixing screw 19. ing.

  As shown in FIG. 8, the cover 13 is removed from the base 12 by sliding the cover 13 upward with respect to the existing watt hour meter installed on the mounting plate 16. Then, as shown in FIG. 9, after loosening the fixing screws 19 located on both sides of the terminal portion 15 of the base 12, the metal plate 31 is inserted between the base 12 and the mounting plate 16 from above.

  When the fixing screw 19 is loosened in this way, the locking portion 18 of the base 12 is simply hooked on the locking screw 17 of the mounting plate 16. Therefore, since a gap is formed between the base 12 and the mounting plate 16, the metal plate 31 can be inserted between the base 12 and the mounting plate 16 using the gap.

  When the metal plate 31 is inserted, the locking screw 17 of the mounting plate 16 is inserted into the locking slit 32 of the metal plate 31, and the fixing screw 19 of the mounting plate 16 is inserted into the fixing slit 33 of the metal plate 31. Insert.

  At this time, since the tapered portions 34 and 35 are provided in the openings of the locking slit 32 and the fixing slit 33, the locking screw 17 and the fixing to the locking slit 32 and the fixing slit 33 are fixed. The insertion of the service screw 19 is easy.

  When the insertion of the metal plate 31 is completed, the innermost part of the locking slit 32 comes into contact with the locking screw 17 and the innermost part of the fixing slit 33 comes into contact with the fixing screw 19. Thereby, the metal plate 31 is positioned between the base 12 and the mounting plate 16.

  In this state, the base 12 is fixed to the mounting plate 16 via the metal plate 31 by tightening the fixing screws 19 located on both sides of the terminal portion 15 of the base 12. Thereafter, as shown in FIG. 10, the cover 13 is slid from above the base 12, so that the cover 13 is fitted and fixed to the base 12.

  Thus, if the metal plate 31 having the locking slit 32 and the fixing slit 33 is used, the base 12 and the mounting plate 16 of the watt hour meter can be removed without removing the existing watt hour meter from the mounting plate 16. The metal plate 31 can be interposed between the two.

  In the embodiment described above, the case where the flat metal plates 21, 41, and 31 (see FIGS. 2, 5, and 9) are used has been described. However, the present invention is not limited to this, and FIG. 11, 12 and 13 can be used.

  FIG. 11 is a modification of the metal plate 21 shown in FIG. 2 and shows a metal plate 26 used for a new watt hour meter. FIG. 12 is a modification of the metal plate 41 shown in FIG. The metal plate 56 used with respect to a watt-hour meter is shown. FIG. 13 is a modification of the metal plate 31 shown in FIG. 9 and shows a metal plate 36 used for an existing watt-hour meter.

  The usage forms and attachment methods of the metal plates 26, 56, and 36 shown in FIGS. 11, 12, and 13 are the same as those of the metal plates 21, 41, and 31 shown in FIGS. Duplicate explanation is omitted.

  These metal plates 26, 56, and 36 are bent portions 27, 57, and 37 located on the left and right sides of the watt-hour meter (see FIGS. 1, 6, and 7), as shown in FIGS. Is integrated. By having such bent portions 27, 57, and 37, the surface areas of the metal plates 26, 56, and 36 can be increased.

  As a result, the heat radiating action by the heat conduction of the metal plates 26, 56, 36 can be further exhibited. By using the metal plates 26, 56, and 36 having the bent portions 27, 57, and 37, it is possible to further suppress the watt-hour meter from becoming high temperature during long-term use of the watt-hour meter in an overload state.

  In addition, the lower end edge part of this bending part 27,57,37 is located above the lower end edge part of the metal plates 26,56,36. In this way, the lower edge of the bent portions 27, 57, and 37 is positioned away from the distribution line led out from the terminal portion 15 of the watt-hour meter.

  In this way, the lower end edge of the bent portions 27, 57, 37 is located at a position separated from the distribution line led out from the terminal unit 15 of the watt hour meter, so that the distribution line is connected to the terminal unit 15 of the watt hour meter. In order to ensure safety, the distribution line is prevented from accidentally coming into contact with the metal bent portions 27, 57, and 37 during the operation of connecting the wires.

  The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. It includes the equivalent meanings recited in the claims and the equivalents recited in the claims, and all modifications within the scope.

12 Base 13 Cover 16 Structure (Mounting plate)
21, 41, 31 Metal plate 26, 56, 36 Metal plate 27, 57, 37 Bending part 32, 33 Slit

Claims (5)

An electricity meter mounting structure comprising a base attached to a structure of a power consumer and a cover attached to the front surface of the base,
A structure for installing an watt-hour meter, wherein a heat dissipating member in contact with the back surface of the base is interposed between the base and the structure.   The watt-hour mounting structure according to claim 1, wherein the heat dissipating member is a metal plate.   The watt-hour meter mounting structure according to claim 1, wherein the heat dissipating member is integrated with the base.   The watt-hour attachment structure according to any one of claims 1 to 3, wherein the heat dissipating member has a slit so as to be inserted between the base and the structure.   The said heat radiating member is the attachment structure of the watt-hour meter as described in any one of Claims 1-4 which integrally has the bending part located in the right-and-left both sides of the said watt-hour meter.

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