JP2012202917A - Watt-hour meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a screw member from falling out from a support part of the screw member.SOLUTION: A watt-hour meter includes a watt-hour meter body base and a packaged measuring part detachably attached to the watt-hour meter body base. The measuring part includes: a screw member supporting part having an insertion hole for inserting the screw member for fixing the measuring part on the watt-hour meter body base; and a locking part arranged on a position separated from the screw member supporting part by a predetermined distance in an axial length direction of the insertion hole and capable of abutting on and locking the head part of the screw member moved in a removing direction to regulate further movement of the screw member and prevent the screw member from falling out from the screw member supporting part.

Description

  The present invention relates to a watt-hour meter, and more particularly, to a watt-hour meter that prevents a screwing member that fixes a metering unit to a watt-hour meter body base from falling off the watt-hour meter.

  In the watt-hour meter, replacement, inspection / repair, and maintenance are performed at regular intervals. For the purpose of improving the workability of watt-hour meter replacement, inspection and repair, and maintenance, unitization is performed for each function of the watt-hour meter (for example, Patent Document 1).

JP 2010-181297 A

  When unitizing each function of the watt hour meter, each unit needs to be attached to the watt hour meter base. When each unit is attached to the watt hour meter base using a screw member such as a bolt, it is necessary to tighten the screw member that connects each unit and the watt hour meter base. Conversely, when removing each unit from the watt hour meter base, it is necessary to loosen the screwing member.

  Here, since the tightening operation of the screwing member is performed on the watt-hour meter main body base mounted perpendicularly to the wall surface of the dwelling, the tightening operation is performed by interference of the tightening tool with other units, It may be difficult due to the narrow working space. Further, when the screwing member falls off from the support portion of the screwing member, the work tends to be complicated, for example, it is necessary to pick up the screwing member that has dropped and insert it again into the support portion. In particular, when the dropped screw member enters the already attached unit or the like, it is necessary to take out the screw member further.

  This invention makes it a subject to provide the watt-hour meter which prevents that a screwing member falls from the support part of a screwing member in view of such a situation.

  The present invention is for solving the above-described problems, and is an watt-hour meter including a watt-hour meter base and a packaged measuring unit that is detachably attached to the watt-hour meter base. The metering unit includes a screwing member support unit having an insertion hole through which a screwing member for fixing the metering unit to the wattmeter body base is inserted, and an axial length direction of the insertion hole from the screwing member support unit The screw member is arranged at a predetermined distance and is in contact with and locked to the head of the screw member moved in the removal direction, thereby restricting further movement of the screw member. It is provided with the latching | locking part which prevents falling from a support part.

  According to such a configuration, when the screwing member supported by the screwing member support part moves in the removal direction, the locking part provided in the measuring part comes into contact with the head of the screwing member and locks. This prevents the screwing member from falling off the screwing member support. Thus, when performing the maintenance work of the watt-hour meter, the operator can concentrate on the work without worrying about dropping of the screwing member or losing the screw member, and the watt-hour meter becomes highly convenient.

  The measuring unit is packaged by combining the first and second housings, the screwing member supporting unit is provided on the first housing side, and the locking unit is provided on the second housing side. Further, by separating the second housing, the locking portion may be separated from the screwing member.

  According to such a configuration, the first housing and the second housing are configured to be separable, the screwing member support portion is provided on the first housing side, and the locking portion is provided on the second housing side. When the first housing and the second housing are separated, the screwing member and the locking part are separated from each other, so that the locking part is separated from the screwing member supported by the screwing member support part. The locking of the screwing member by the locking portion can be released. Accordingly, when it is necessary to disassemble and maintain the measuring unit, the maintenance operation can be performed reliably and appropriately without the screwing member getting in the way.

  Moreover, it is desirable that the screwing member support portion is configured as a terminal that is electrically connected to the electric wire so as to constitute a circuit for measuring the amount of electric power by the measuring portion.

  According to such a configuration, the screwing member supporting portion is also used as a terminal of a circuit for measuring the amount of electric power, thereby reducing the number of parts of the measuring portion as much as possible and reducing the production cost of the watt-hour meter. It becomes possible to reduce.

  The watt hour meter base includes an electric wire connecting portion to which an electric wire is connected and a conductive bar for electrically connecting the electric wire connecting portion and the screwing member support portion, and one end of the conductive bar is an electric wire connecting portion. It is desirable that the other end of the conductive bar is connected to the screw member support part via a screw member.

  According to such a configuration, the measuring portion and the electric wire can be connected at a distance from each other by interposing the conductive bar between the electric wire connecting portion and the screwing member supporting portion as the terminal. . As a result, the electric wire can be easily and reliably connected to the measuring unit without being affected by the size and shape of the measuring unit.

  Moreover, the latching | locking part can employ | adopt the structure which has a guide part which guides the predetermined | prescribed operation | movement of the tool for operating a screwing member.

  According to such a configuration, the guide portion guides the tool with respect to the screwing member, so that the screwing member can be easily tightened or loosened.

  The screw member has an engaging recess with which the tool is engaged, and the guide portion has a guide surface for guiding the tool so that the tool is engaged with the engagement recess of the screw member. Can be adopted.

  According to such a configuration, the tool can be easily engaged with the engaging recess of the screwing member by guiding the tool toward the engaging recess by the guide surface, and workability can be improved.

  Further, the screwing member has an engaging recess with which the tool is engaged, and the guide portion regulates an operation of rotating the screwing member by engaging the tool with the engaging recess of the screwing member. Thus, the structure which has a curved surface which curves along the direction of rotation of this tool is employable.

  According to such a configuration, when the tool is rotated to rotate the screwing member, when the tool moves in the radial direction, the movement is restricted by contacting the curved surface. As a result, the operator can appropriately and accurately rotate the tool and perform the tightening / loosening operation of the screwing member.

  As described above, according to the watt-hour meter according to the present invention, there is an excellent effect that the screwing member can be prevented from dropping from the screwing member support portion.

The top view of the watt-hour meter which concerns on one Embodiment of this invention is shown. The top view of the watt-hour meter in the state which removed the sealing cover which concerns on the embodiment is shown. The top view of the watt-hour meter main body base of the watt-hour meter which concerns on the embodiment is shown. The side surface schematic of the watt-hour meter which concerns on the same embodiment is shown. The principal part top view of the watt-hour main body base which concerns on the embodiment is shown. The side view of the measurement part which concerns on the same embodiment is shown. The top view of the measurement part which concerns on the same embodiment is shown. The bottom view of the measurement part which concerns on the same embodiment is shown. The top view of the 1st housing concerning the embodiment is shown. The side view of the 1st housing concerning the embodiment is shown. The top view of the 2nd housing concerning the embodiment is shown. The side view of the 2nd housing concerning the embodiment is shown.

  Hereinafter, an embodiment of the watt-hour meter according to the present invention will be described with reference to FIGS.

  The watt-hour meter 10 is used for calculating, displaying, and communicating an integrated power amount by being connected to an electric wire. As shown in FIGS. 1 to 4, the watt hour meter 10 includes a watt hour meter base 20 attached to a wall surface of a residence, and a metering unit 30 connected to the watt hour meter base 20 to calculate and display the amount of power. A communication unit 40 that functions as a PLC (Power Line Telecommunication) communication adapter or a wireless communication adapter, and a sealing cover 50 for preventing unauthorized operation of the watt hour meter base 20, the metering unit 30, and the communication unit 40 Is provided.

  The watt-hour meter main body 20 connects the electric wire and the measuring unit 30 and supplies power to the measuring unit 30. The metering unit 30 measures the voltage value and the current value in the electric circuit connected to the watt hour meter base 20 and calculates the integrated power amount. The metering unit 30 displays the calculated integrated power amount and transmits it to the communication unit 40. The communication unit 40 transmits the transmitted accumulated power amount to the power company.

  The watt-hour meter main body base 20 has a rectangular shape. The watt-hour meter base 20 is formed so as to be able to accommodate a part of the metering unit 30 and the communication unit 40. Moreover, the watt-hour meter main body base 20 is formed so that the sealing cover 50 can be locked and the measuring unit 30 and the communication unit 40 can be sealed.

  The watt-hour main body base 20 includes a connecting unit 100 that connects the electric wire and the measuring unit 30, a storage unit 200 that stores the measuring unit 30, a part of the connecting unit 100, and a part of the communication unit 40, and a sealing cover. And a fixing part 300 for fixing 50.

  The connection portion 100 is connected to each of the plurality of wire fitting portions 110, 110,... Connected to the electric wire, the plurality of terminal fittings 120, 120,. Conductive bars 130, short-circuit bars 160 that short-circuit some of the conductive bars 130, and terminal pieces 170 that supply operating power of the weighing unit 30 from some of the conductive bars 130.

  The plurality of electric wire connecting portions 110, 110,... Each electric wire connection part 110 is provided in the short direction of the watt-hour main body base 20 at predetermined intervals. In this embodiment, each electric wire connection part 110 is utilized as 1S terminal, 2S terminal, 3S terminal, 1L terminal, 2L terminal, and 3L terminal. The 1S terminal wire connecting portion 110 to the 3S terminal wire connecting portion 110 are connected to the electric power company side wires. The wire connecting part 110 of the 2S terminal is for a neutral wire. The 1L terminal wire connecting portion 110 to the 3L terminal wire connecting portion 110 are connected to the electric wire on the residential side. The 2L terminal electric wire connecting portion 110 is for a neutral wire.

  Each terminal fitting 120 is formed in a long plate shape, and the longitudinal direction thereof is arranged along the longitudinal direction of the watt-hour main body base 20. Each terminal fitting 120 has one end connected to the wire connecting part 110 and the other end electrically connected to the conductive bar 130.

  The plurality of conductive bars 130 are formed of a conductive metal, such as brass or copper. The plurality of conductive bars 130 include a first conductive bar 131 that electrically connects the 1S terminal and the weighing unit 30, a second conductive bar 132 that electrically connects the 2S terminal and the weighing unit 30, and 3S. A third conductive bar 133 that electrically connects the terminal and the weighing unit 30, a fourth conductive bar 134 that electrically connects the communication unit 40 and the weighing unit 30, and a 3L terminal and the communication unit 40. A fifth conductive bar 135 that is electrically connected, a sixth conductive bar 136 that is electrically connected to the communication unit 40 and the weighing unit 30, and a seventh that is electrically connected to the 1L terminal and the communication unit 40. Conductive bar 137.

  The first conductive bar 131 is formed in a long plate shape. The first conductive bar 131 is arranged in the longitudinal direction of the watt-hour main body base 20 in the longitudinal direction. The first conductive bar 131 is provided to supply power from the electric wire to the measuring unit 30. The first conductive bar 131 has an end portion 141 connected to the terminal fitting 120 corresponding to the 1S terminal and an end portion 142 connected to the measuring unit 30.

  The second conductive bar 132 is formed in a substantially long plate shape. The second conductive bar 132 is arranged in the longitudinal direction of the watt-hour main body base 20 in the longitudinal direction. The second conductive bar 132 is provided for a neutral wire from the electric wire to the measuring unit 30. The second conductive bar 132 has an end 143 connected to the terminal fitting 120 corresponding to the 2S terminal, and an end 144 connected to the measuring unit 30.

  The third conductive bar 133 is formed in a long plate shape. The third conductive bar 133 is arranged in the longitudinal direction of the watt-hour main body base 20 in the longitudinal direction. The third conductive bar 133 is provided to supply power from the electric wire to the measuring unit 30. The third conductive bar 133 has an end 145 connected to the terminal fitting 120 corresponding to the 3S terminal, and an end 146 connected to the measuring unit 30.

  The fourth conductive bar 134 is provided to be electrically connected to the fifth conductive bar 135 via the communication unit 40. The fourth conductive bar 134 is provided to supply power from the measuring unit 30 to the residence. The fourth conductive bar 134 has an end 147 connected to the communication unit 40 and an end 148 connected to the measuring unit 30.

  The fifth conductive bar 135 is provided to supply power from the fourth conductive bar 134 to the residence. The fifth conductive bar 135 has an end 149 connected to the terminal fitting 120 corresponding to the 3L terminal, and an end 150 connected to the communication unit 40.

  The sixth conductive bar 136 is provided to be electrically connected to the seventh conductive bar 137 via the communication unit 40. The sixth conductive bar 136 is provided to supply power from the measuring unit 30 to the residence. The sixth conductive bar 136 has an end 151 connected to the communication unit 40 and an end 152 connected to the measuring unit 30.

  The seventh conductive bar 137 is provided to supply power from the sixth conductive bar 136 to the residence. The seventh conductive bar 137 has an end 153 connected to the terminal fitting 120 corresponding to the 1L terminal, and an end 154 connected to the communication unit 40.

  Here, one end portions 142, 144, 146, 148 of the first conductive bar 131, the second conductive bar 132, the third conductive bar 133, the fourth conductive bar 134, and the sixth conductive bar 136 are used. , 152 are arranged at positions along the vicinity of the electricity meter main body base 20. That is, the end portions 142, 144, 146, 148, 152 are arranged at a predetermined interval along the short direction of the watt-hour main body base 20. In addition, each of the end portions 142, 144, 146, 148, 152 has a screwing hole (not shown) for screwing with a part of the measuring unit 30.

  The shorting bar 160 is provided to short-circuit the terminal fitting 120 corresponding to the 2S terminal of the neutral wire and the terminal fitting 120 corresponding to the 2L terminal of the neutral wire. The shorting bar 160 connects the end of the terminal fitting 120 corresponding to the 2S terminal and the end of the terminal fitting 120 corresponding to the 2L terminal. That is, the shorting bar 160 is also connected to the end 143 of the second conductive bar 132 connected to the 2S terminal. The shorting bar 160 has a U shape for the purpose of avoiding interference with the terminal fitting 120 of the 3S terminal and the terminal fitting 120 of the 3L terminal.

  The terminal piece 170 is provided so as to partially overlap the end portion 142 of the first conductive bar 131 and the end portion 146 of the third conductive bar 133. The terminal piece 170 has a width wider than the end 142 and the end 146 in the short direction of the watt-hour main body base 20. As a result, the terminal piece 170 forms a circuit in parallel with the first conductive bar 131 and the third conductive bar 133 with respect to the measuring unit 30. That is, the terminal piece 170 forms a circuit for supplying operating power to the measuring unit 30 separately from the first conductive bar 131 and the third conductive bar 133. The terminal piece 170 has two terminals, one of which is electrically connected to the end portions 142 and 146 of the conductive bars 131 and 133 and the other of which is electrically connected to the measuring unit 30. The end of the terminal piece 170 is disposed at a position along the vicinity of the measuring unit 30.

  As shown in FIGS. 4 and 5, the storage unit 200 includes a first storage unit 210 that stores the weighing unit 30, a second storage unit 220 that stores a part of the connection unit 100 and a part of the communication unit 40. Have

  Here, the storage unit 200 includes an annular partition wall 201 provided along the outer edge of the wattmeter main body base 20, and the short side of the wattmeter main body base 20 in the middle of the wattmeter main body base 20 in the longitudinal direction. The partition wall 202 extends in the direction, and the base cover 203 covers a partial area partitioned by the partition walls 201 and 202. The first storage unit 210 and the second storage unit 220 are formed adjacent to each other via the partition wall 202.

  The partition wall 201 is formed to protrude from the bottom surface 21 of the watt-hour main body base 20. The height of the partition wall 201 from the bottom surface 21 of the watt-hour main body base 20 is higher than the height of the partition wall 202 from the bottom surface 21.

  The partition wall 202 is formed so as to protrude from the bottom surface 21 of the watt-hour main body base 20. The partition wall 202 has end portions 142 of the first conductive bar 131, end portions 146 of the third conductive bar 133, and end portions of the fourth conductive bar 134 at the end portions facing the end portions on the bottom surface 21 side. 148 and a plurality of bar fitting portions 204 fitted to the end portions 152 of the sixth conductive bar 136, and a terminal piece fitting portion 205 fitted to each of the plurality of terminal pieces 170, 170. . The first storage unit 210 and the second storage unit 220 are formed adjacent to each other via the partition wall 202.

  The bar fitting portion 204 has a concave shape that is recessed toward the bottom surface 21 so as to be fitted to the end portions 142, 144, 146, 148, 152. The bar fitting portion 204 has an equal height with respect to the bottom surface 21 of the watt-hour main body base 20 so as to align the heights of the end portions 142, 144, 146, 148, 152. A part of the bar fitting part 204 has a width capable of fitting with a part of the terminal piece 170.

  The terminal piece fitting portion 205 has a concave shape that is recessed toward the bottom surface 21 of the watt-hour main body base 20 so as to be fitted to the terminal piece 170. The terminal piece fitting portion 205 has an equal height with respect to the bottom surface 21 in order to align the height with respect to the bottom surface 21 of the terminal piece 170.

  The base cover 203 is configured to have a predetermined area so as to cover the second storage unit 220 on one surface. The base cover 203 is configured to lock a part of the communication unit 40 on the other surface. Specifically, the base cover 203 has a claw portion 206 that locks the communication unit 40 on the other surface. The claw portion 206 is configured to be locked in a state where a part of the communication portion 40 is in contact with the other surface of the base cover 203.

  The first storage unit 210 includes a pair of claws 208 having claws for fixing the measurement unit 30 to the watt-hour main body base 20 in order to store the measurement unit 30 in an appropriate position.

  The claw portion 208 is provided so as to protrude from the bottom surface 21. The nail | claw part 208 is provided at predetermined intervals, and is comprised so that the measurement part 30 can be accommodated among itself. When the weighing unit 30 is stored in the first storage unit 210, each of the claw portions 208 is engaged with a predetermined position of the weighing unit 30 to engage the weighing unit 30, as shown in FIGS. Stop. Accordingly, the claw portion 208 stores and fixes the measuring unit 30 in the first storage unit 210.

  The second storage part 220 is provided between the first storage part 210 and the wire connection part 110 in the longitudinal direction of the watt-hour main body base 20. The second storage unit 220 stores a part of the connection unit 100 and a part of the communication unit 40. The second storage unit 220 is covered with the base cover 203 in a state where a part of the connection unit 100 and a part of the communication unit 40 are stored.

  The fixing part 300 is provided so as to protrude outward from the outer edge of the watt-hour main body base 20 in a plate shape. The fixing part 300 has locking holes 231 and 232 for locking the sealing cover 50.

  As shown in FIGS. 6 to 8, the measuring unit 30 is configured to be able to display the calculated integrated power amount on the top surface 301. The measuring unit 30 can be electrically connected to the watt-hour main body base 20 by being stored in the first storage unit 210.

  The weighing unit 30 includes a first current line 311 that can be electrically connected to the 1S terminal and the 1L terminal via the first conductive bar 131 and the sixth conductive bar 136, the third conductive bar 133, and the fourth conductive bar 133. The second current line 312 that can be electrically connected to the 3S terminal and the 3L terminal via the conductive bar 134, and the first current line 311 and the second current line 312 are electrically connected to calculate the integrated electric energy. The calculation display unit 320 to be displayed, the screwing member 330 provided at the ends of the first current line 311 and the second current line 312, and the first current line 311 and the second current line 312 of the screwing member 330 are dropped off. A plurality of locking portions 340 that prevent the connection, a connection terminal 350 that can be electrically connected to the terminal piece 170, a first current line 311, a second current line 312, a calculation display unit 320, a screwing member 330, Locking part 340, And a rectangular shape in a planar view the housing 360 for packaging the pre-connection terminals 350.

  The first current line 311 is for calculating the current value between the first conductive bar 131 and the sixth conductive bar 136 by the calculation display unit 320. The first current line 311 is provided at a predetermined interval from the second current line 312 for the purpose of preventing interference with the second current line 312. The first current line 311 is provided at a first line portion 338 having a predetermined length, and at each end of the first line portion 338, and the first conductive bar 131 and the sixth conductive bar 136. And a first screw member support portion 370 that engages with.

  As shown in FIG. 3, the first line portion 338 is configured in a U shape with a predetermined length in order to connect the first conductive bar 131 and the sixth conductive bar 136.

  The two first screw member support portions 370 and 370 are terminals. A part of the two first screwing member support portions 370 and 370 is provided so as to protrude from the side surface 302 corresponding to the long side of the housing 360. The first screw member support part 370 comes into contact with the end part 142 of the first conductive bar 131 and the end part 152 of the sixth conductive bar 136 as a result of the storage of the measuring part 30 in the first storage part 210. . The first screwing member support portion 370 is electrically connected to the watt-hour main body base 20 by contacting the end portions 142 and 152. The first screw member support portion 370 has a first insertion hole 371 through which the screw member 330 is inserted so as to lock the first current line 311 to the end portions 142 and 152.

  The first insertion hole 371 has a diameter through which the screwing member 330 can be inserted. The axial direction (axial direction) of the first insertion hole 371 corresponds to a screwing hole (not shown) provided in the end portions 146 and 148 as a result of storage of the measuring unit 30 in the first storage unit 210. It matches the axial direction (axial direction).

  The second current line 312 is for calculating the current value between the third conductive bar 133 and the fourth conductive bar 134 by the calculation display unit 320. The second current line 312 is provided at each end of the second line portion 339 having a predetermined length and the second line portion 339, and the third conductive bar 133 and the fourth conductive bar 134 And a second screwing member support portion 380 to be engaged.

  The second line portion 339 is configured in a U shape with a predetermined length in order to connect the third conductive bar 133 and the fourth conductive bar 134. The length of the second line part 339 is set shorter than the length of the first line part 338.

  The 2nd screwing member support part 380 is a terminal. The second screw member support portion 380 is provided so as to protrude from the longitudinal side surface 302 of the housing 360. The second screwing member support part 380 comes into contact with the end part 146 of the third conductive bar 133 and the end part 148 of the fourth conductive bar 134 as a result of the storage of the measuring part 30 in the first storage part 210. . The second screwing member support portion 380 is in contact with the end portions 146 and 148 and is electrically connected to the watt-hour main body base 20 by being fastened by the screwing member 330. The second screwing member support 380 has a second insertion hole 381 through which the screwing member 330 is inserted in order to lock the second current line 312 to the terminals 146 and 148.

  The second insertion hole 381 has a diameter through which the screwing member 330 can be inserted. The axial length direction of the second insertion hole 381 coincides with the axial length direction of screw holes (not shown) provided in the end portions 146 and 148 as a result of the storage of the measuring unit 30 in the first storage unit 210. To do.

  The calculation display unit 320 is contained in the housing 360 and fixed. The calculation display unit 320 calculates and displays the integrated power amount from the current amount measured from the first current line 311 and the second current line 312.

  The calculation display unit 320 is provided on the top surface 301 side of the housing 360. The calculation display unit 320 is provided on the top surface 301 side of the housing 360 so that the integrated power amount can be visually recognized even when the measuring unit 30 is stored in the first storage unit 210.

  As shown in FIG. 7, the screwing member 330 is composed of a plurality of (four in the illustrated example) bolts and the like. Of the four screw members 330, two screw members 330a and 330a are supported by the first screw member support portion 370, and the other two screw members 330b and 330b are the second screw members. It is supported by the support part 380. Hereinafter, the screwing member 330a supported by the first screwing member support 370 is referred to as “first screwing member”, and the screwing member 330b supported by the second screwing member support 380 is referred to as “first screwing member”. It is referred to as “two screwed members”.

  The length L of the screwing member 330 is longer in the longitudinal direction than the distance M between the locking portion 340 and the first screwing member support 370 or the second screwing member support 380. Therefore, the screwing member 330 moves in a direction (extraction direction) to be removed from the first insertion hole 371 or the second insertion hole 381 and comes into contact with the screwing member 330 locking portion 340, so that it is further increased. Restricted to move.

  The first screwing member 330a and the second screwing member 330b have a head portion 331 and a shaft portion 332 that can be inserted into the insertion holes 371 and 381 of the screwing member support portions 370 and 380.

  The head 331 has a larger diameter than the first insertion hole 371 or the second insertion hole 381. The head 331 has an engagement recess 351 into which a tool for rotating the screwing member 330 can be fitted. The head 331 includes the first screw member support portion 370 or the second screw by tightening the screw members 330 (330a, 330b) in the axial length direction (axial direction) of the insertion holes 371, 381. The combined member support portion 380 is locked to the end portions 142, 146, 148, 152. On the other hand, the head 331 moves in the direction of coming out of the first insertion hole 371 or the second insertion hole 381 by the loosening of the screwing member 330 in the axial direction, and contacts the locking portion 340. Touch.

  The engaging recess 351 is configured to be able to be fitted with a tool, and has a shape matched to the tool. For example, when the tool is a hexagon wrench, the engagement recess 351 is configured as a hexagonal hole into which the end of the tool can be fitted.

  The shaft portions 332 of the first screwing member 330 a and the second screwing member 330 b have a smaller diameter than the first insertion hole 371 and the second insertion hole 381. Accordingly, the shaft portion 332 can freely move in the axial length direction of the first insertion hole 371 or the second insertion hole 381. The shaft portion 332 is screwed into the screw holes of the end portions 142, 146, 148, 152 of the conductive bars 131, 133, 134, 136 by tightening the screw members 330 (330 a, 330 b) in the axial length direction. Enter. On the other hand, the head 331 moves in the direction of coming out of the first insertion hole 371 or the second insertion hole 381 (direction approaching the locking portion 340) by loosening the screwing member 330 in the axial direction. To do. With the head portion 331 in contact with the locking portion 340, the shaft portion 332 remains in a state where it is inserted into the first insertion hole 371 or the second insertion hole 381.

  The plurality of locking portions 340, 340,... Are spaced apart from the first screw member support portion 370 and the second screw member support portion 380 by a predetermined distance (M) so as to come into contact with the head portion 331. 362 is provided at a predetermined position. Each locking part 340 abuts on the head 331 to restrict further movement of the screwing member 330 in the removal direction.

  The locking portion 340 includes a contact portion 341 that contacts the head portion 331, and a guide portion 342 that guides the screwing member 330 to a tool (not shown) for rotating the screwing member 330. .

  The contact part 341 is provided in the axial length direction (axial direction) of the insertion holes 371 and 381 of the screw member support parts 370 and 380. The contact portion 341 is provided so as to protrude from the housing 360. Accordingly, the contact portion 341 has a contact surface that faces the first screw member support portion 370 or the second screw member support portion 380. The contact surface is in contact with the head portion 331 of the screwing member 330, thereby supporting the first screwing member of the screwing member 330 inserted into the first insertion hole 371 or the second insertion hole 381. Dropping from the portion 370 or the second screwing member support portion 380 is prevented.

  The guide portion 342 includes a first guide portion 343 that guides the tip of a tool for rotating the screwing member 330 toward the screwing member 330, and a direction in which the tool for rotating the screwing member 330 rotates. And a third guide that extends from the side surface 302 corresponding to the long side of the housing 360 toward the second guide portion 344. Part 345.

  The first guide portion 343 is configured as a pair protruding from the side surface 302 corresponding to the long side of the housing 360. Each of the first guide portions 343 and 343 is arranged with a width capable of inserting a tool such as a hexagon wrench. Further, the first guide portion 343 is arranged with a width that comes into contact with the tool when the moving direction of the tool deviates from the axial direction of the insertion holes 371 and 381 of the screwing member support portions 370 and 380. Thereby, the first guide part 343 engages the head 331 with the tip of the tool inserted from the direction along the top surface 301 of the measuring unit 30. That is, the first guide part 343 moves the tool from the direction along the top surface 301 toward the axial direction of the first insertion hole 371 and the second insertion hole 381. Therefore, the moving direction of the tool does not greatly deviate from the axial direction of the first insertion hole 371 or the second insertion hole 381. If the moving direction of the tool is deviated from the axial direction of the first insertion hole 371 or the second insertion hole 381, the first guide portion 343 contacts the tool and the tool is inserted into the first insertion hole. 371 or the second insertion hole 381 can be directed in the axial direction.

  The second guide part 344 is provided to protrude from the side surface 302 corresponding to the long side of the housing 360. The second guide portion 344 has a curved surface 333 having a radius of curvature larger by a predetermined amount than the diameter of the tool. The axis of the curved surface 333 coincides with the axis of the first insertion hole 371 or the second insertion hole 381 in the axial length direction. Thereby, when the tool engaged with the screwing member 330 is rotated, the second guide portion 344 does not deviate from the axial direction of the first insertion hole 371 or the second insertion hole 381. Even if the tool is deviated from the axial length direction of the first insertion hole 371 or the second insertion hole 381, the curved surface 333 is brought into contact with the tool so that the first insertion hole 371 or the second insertion hole 371 is in contact with the tool. Large deviation from the axis of the insertion hole 381 is restricted.

  The third guide part 345 is guided by the first guide part 343, and a tool that moves in the axial direction of the first insertion hole 371 or the second insertion hole 381 is applied to the curved surface 333 of the second guide part 344. Lead. The third guide portion 345 has a guide surface 346 extending from the side surface 302 corresponding to the long side of the housing 360 toward the curved surface of the second guide portion 344.

  The guide surface 346 is a straight line that is inclined at a predetermined angle with respect to the side surface 302 corresponding to the long side of the housing 360 so as to contact the tool moving in the axial direction of the first insertion hole 371 or the second insertion hole 381. It is an inclined surface. The guide surface 346 is in contact with the tool moving in the axial direction of the first insertion hole 371 or the second insertion hole 381, thereby guiding the tip of the tool to the screwing member 330 via the curved surface 333. enable. The guide surface 346 may be curved with a predetermined radius of curvature.

  The connection terminal 350 is provided so as to protrude from the side surface 302 corresponding to the long side of the housing 360. The connection terminal 350 is electrically connected to the calculation display unit 320 inside the housing 360. The connection terminal 350 is electrically connected to the terminal piece 170 of the watt-hour main body base 20 and the end 144 of the second conductive bar 132 by storing the measuring unit 30 in the first storage unit 210. That is, the connection terminal 350 protrudes from the housing 360 to the extent that it can contact the terminal piece 170 and the end portion 144 by storing the measuring unit 30 in the first storage unit 210. The connection terminal 350 supplies the power of the calculation display unit 320 from the terminal piece 170 and causes the second conductive bar 132 to function as a neutral wire.

  The housing 360 is mounted on the watt-hour main body base 20 in a direction parallel to the axial length direction of the first insertion hole 371 or the second insertion hole 381, and is configured so that a part can be stored in the first storage unit 210. The The housing 360 is configured to be separable into two housings 361 and 362. Hereinafter, one of the two housings 361 and 362 is referred to as a first housing 361, and the other is referred to as a second housing 362.

  As shown in FIG. 9, the first housing 361 has a rectangular shape in plan view. As shown in FIGS. 9 and 10, the first housing 361 includes a pair of groove portions 363 and 363 that fit into the claw portion 206 of the watt-hour main body base 20, a first screwing member support portion 370, and a second one. A first fitting portion 364 that fits with the screwing member support portion 380, a second fitting portion 365 that fits with the connection terminal 350, and the first current line 311 and the second current inside the first housing 361. A current line support portion 366 that supports the current line 312, a first connection member 367 that connects the first housing 361 and the second housing 362, and a first connection that extends in a direction parallel to the pair of grooves 363 and 363. A hole 334 and a second connecting hole 335 are provided.

  Each of the groove portions 363 and 363 is provided as a pair at an intermediate position between the side surfaces 368 and 369 corresponding to the short side of the first housing 361. Each groove part 363, 363 extends along the axial length direction of the first insertion hole 371 and the second insertion hole 381. The width of the groove 363 is larger than the width of the pair of claws 208, 208 provided on the watt-hour main body base 20.

  The first fitting portion 364 is provided on the side surface 400 corresponding to the long side of the first housing 361. The first fitting portion 364 is provided at the end of the side surface 400 on the side combined with the second housing 362. The first fitting portion 364 is fitted with the screwing member support portions 370 and 380 to project the screwing member support portions 370 and 380 from the inside of the first housing 361.

  The second fitting portion 365 is provided on the side surface 400 corresponding to the long side of the first housing 361. The second fitting portion 365 is provided at the end of the side surface 400 on the side combined with the second housing 362. The second fitting portion 365 is fitted with the connection terminal 350 and protrudes from the inside of the first housing 361.

  The current line support portion 366 is provided in the first housing 361. The current line support portion 366 is configured to be able to engage with the first current line 311 and the second current line 312. The current line support portion 366 engages the first current line 311 with the first current line fitting portion 391 and engages the second current line 312 with the second current line fitting portion 392.

  The first connecting member 367 is constituted by a tapping screw or the like, for example, and is inserted through the first communication hole 334. The first connecting member 367 is screwed into the first connecting hole 334 and a third connecting hole 336 of the second housing 362 to be described later, and is locked to the outer surface of the first housing 361, so that the first housing 361 and the second housing 362 are connected and fixed.

  The first connection hole 334 is provided at one corner of the first housing 361 having a rectangular shape in plan view. The second connection hole 335 is provided in a corner portion on the diagonal line of the first communication hole 334 in the first housing 361 having a rectangular shape in plan view.

  As shown in FIG. 11, the second housing 362 has a rectangular shape in plan view. As shown in FIG. 12, the second housing 362 is integrally provided with a locking portion 340. Thereby, the latching | locking part 340 provided in the 2nd housing 362 is cancelled | released control of the movement to the extraction direction of the screwing member 330 by isolate | separating from the 1st housing 361. That is, the second housing 362 makes it possible to remove the screwing member 330 from the screwing member support portions 370 and 380.

  The second housing 362 includes a pair of groove portions 394 and 394 at positions corresponding to the pair of groove portions 363 and 363 of the first housing 361, and a pair of locking surfaces 395 and 395 provided at end portions of the groove portions 394 and 394. , A third fitting portion 396 that fits into the screw member support portions 370 and 380 provided on the side surface 313 corresponding to the long side of the second housing 362, and the top surface 301 of the measuring portion 30 shown in FIG. Window 398, a second connecting member 399 for connecting the first housing 361 and the second housing 362, a third connecting hole 336 and a fourth connecting hole extending in a direction parallel to the pair of grooves 394 and 394. 337.

  The groove portions 394 and 394 are provided as a pair at an intermediate position between the side surfaces 407 and 408 corresponding to the short side of the second housing 362. The groove portions 394 and 394 extend along the axial length direction of the first insertion hole 371 and the second insertion hole 381. The width of the groove 394 is larger than the width of the pair of claws 208, 208 provided on the watt-hour main body base 20.

  The pair of locking surfaces 395 and 395 are provided at the ends of the pair of groove portions 394 and 394 that are locked with the second housing 362. The pair of locking surfaces 395 and 395 engage with the pair of claws 208 and 208 of the watt hour meter base 20 to fix the metering unit 30 to the watt hour meter base 20.

  The third fitting portion 396 is provided at an end portion of the side surface 313 corresponding to the long side of the second housing 362 on the side combined with the first housing 361. The third fitting portion 396 is fitted with the first screwing member support portion 370 and the second screwing member support portion 380, so that the first screwing member support portion 370 and the second screwing member are fitted. The support part 380 is protruded from the inside of the first housing 361.

  The window 398 is provided on the top surface 301 of the second housing 362 shown in FIG. The window 398 is made of a transparent member, and is provided so that the integrated power value can be seen from the outside of the housing 360. The window 398 is provided so that the measurement pulse can be visually recognized from the outside of the housing 360.

  The second connecting member 399 is configured by, for example, a tapping screw or the like, and is inserted through the fourth connecting hole 337 and the second connecting hole 335. The second connecting member 399 is screwed into the fourth connecting hole 337 and the second connecting hole 335 and is locked to the outer surface of the second housing 362, so that the first housing 361 and the second housing 362 is connected and fixed.

  The third connection hole 336 is provided at one corner of the second housing 362 having a rectangular shape in plan view. The fourth connection hole 337 is provided at a corner portion on the diagonal line of the third connection hole 336 in the second housing 362 having a rectangular shape in plan view.

  Here, a method of connecting the first housing 361 and the second housing 362 will be described in detail. The first housing 361 and the second housing 362 are combined so that the positions of the grooves 363 and 363 of the first housing 361 and the positions of the grooves 394 and 394 of the second housing 362 are matched. The first housing 361 and the second housing 362 are combined so that the first fitting portion 364 and the third fitting portion 396 face each other. Thereby, the 1st connecting hole 334 and the 3rd connecting hole 336 correspond, and the 2nd connecting hole 335 and the 4th connecting hole 337 correspond.

  The first connecting member 367 is screwed into the direction from the second housing 362 toward the first housing 361, that is, from the first connecting hole 334 to the third connecting hole 336. The first connecting member 367 is screwed into the second housing 362 until it is locked, thereby connecting the first connecting hole 334 and the third connecting hole 336 together.

  The second connecting member 399 is screwed into the direction from the first housing 361 toward the second housing 362, that is, from the fourth connecting hole 337 to the second connecting hole 335. The second connecting member 399 is screwed into the first housing 361 until it is locked, thereby connecting the first connecting hole 334 and the third connecting hole 336 together. As a result, the first connecting member 367 and the second connecting member 399 together connect the first housing 361 and the second housing 362 together.

  The communication unit 40 is provided to communicate the integrated power amount with the power company. In addition, the communication unit 40 responds to a signal from the electric power company between the fourth conductive bar 134 and the fifth conductive bar 135 of the watt hour meter base 20 and between the sixth conductive bar 136 and the seventh conductive bar 135. The conductive bars 137 are electrically disconnected or connected.

  The sealing cover 50 is provided so as to be engaged with the watt-hour main body base 20 and seal the measuring unit 30 and the communication unit 40. The sealing cover 50 includes a first sealing cover 403 that engages with the partition wall 201 of the watt-hour main body base 20, and a second sealing cover 405 that seals the wire connection portion 110.

  The first sealing cover 403 seals the measuring unit 30 and the communication unit 40 in a space formed by the watt-hour main body base 20. The first sealing cover 403 includes a first cover sealing screw 404 that locks the watt-hour meter main body base 20 and the first sealing cover 403. The first cover sealing screw 404 is screwed into a locking hole 231 formed in the fixing portion 300 of the watthour meter main body base 20 to fix the first sealing cover 403 to the wattmeter main body base 20.

  The second sealing cover 405 seals the electric wire connection part 110 in a space formed by the watt-hour main body base 20. The second sealing cover 405 includes a second cover sealing screw 406 that locks the watt-hour meter main body base 20 and the second sealing cover 405. The second cover sealing screw 406 is screwed into a locking hole 232 formed in the fixing portion 300 of the watthour meter base 20 to fix the second seal cover 405 to the wattmeter main base 20.

  The configuration of the watt hour meter according to the present invention is as described above. Next, the operation of the watt hour meter according to the present embodiment will be described.

  The measuring unit 30 is connected to the electric wire via the connecting unit 100 of the watt-hour main body base 20. Specifically, the wire connection portion 110 corresponding to the 1S terminal and the 1L terminal connected to the wire is connected via the terminal fitting 120, the conductive bar 130, and the first current line 311. In addition, the wire connection part 110 corresponding to the 3S terminal and the 3L terminal connected to the wire is connected via the terminal fitting 120, the conductive bar 130, and the second current line 312.

  The measuring unit 30 acquires current values of a circuit connecting the 1S terminal to the 1L terminal and a circuit connecting the 3S terminal to the 3L terminal, and calculates and displays the integrated power. The terminal piece 170 provides operating power to the measuring unit 30 from the end 142 of the conductive bar 131 corresponding to the 1S terminal and the end 146 of the conductive bar 133 corresponding to the 3S terminal.

  As described above, calculation, display, and the like of the integrated electric energy by the electric energy meter 10 can be performed.

  In addition, the watt-hour meter 10 according to the present embodiment is provided in the measuring unit 30 when the screwing members 330 (330a and 330b) supported by the screwing member support portions 370 and 380 move in the removal direction. The stop portion 340 is in contact with and locked to the head portion 331 of the screwing member 330, so that the screwing member 330 is prevented from falling off from the screwing member support portions 370 and 380. Thereby, when performing the maintenance work of the watt-hour meter 10, the operator can concentrate on the work without worrying about the screwing member 330 dropping off or losing it, and the watt-hour meter 10 is highly convenient. become.

  In addition, when the first housing 361 and the second housing 362 are separated by the screw member support portions 370 and 380 being provided in the first housing 361 and the locking portion 340 being provided in the second housing 362, When the screwing member 330 and the locking part 340 are separated from each other, the locking part 340 is separated from the screwing member 330 supported by the first screwing member support parts 370 and 380, and thereby the locking part 340 is separated. The engagement of the screwing member 330 can be released. Thereby, when it is necessary to disassemble and maintain the measuring unit 30, the screwing members 330a and 330b can be reliably and appropriately performed without obstructing.

  In addition, the screwing member support portions 370 and 380 are also used as terminals electrically connected to the electric wires so as to form a circuit for measuring the amount of electric power by the measuring unit 30, so that the components of the measuring unit 30 The number of points can be reduced as much as possible, and the manufacturing cost of the watt-hour meter 10 can be reduced.

  In addition, since one end of the conductive bar 130 is connected to the electric wire connecting portion 110 and the other end of the conductive bar is connected to the screwing member support portions 370 and 380 via the screwing member 330, the electric wire connecting portion 110 is connected. And the first screwing member support part 370 and the second screwing member support part 380 as terminals are interposed between the measuring part 30 and the electric wire at a spaced position by interposing the conductive bar 130 therebetween. Will be able to. Accordingly, the electric wire can be easily and reliably connected to the measuring unit 30 without being affected by the size and shape of the measuring unit 30.

  In addition, since the locking portion 340 has a guide portion 342 that guides a predetermined operation of the tool for operating the screwing member 330, the guide portion 342 guides the tool with respect to the screwing member 330. Thus, the screwing member 330 can be easily tightened or loosened.

  The guide 342 has a guide surface 346 that guides the tool so that the tool engages with the engagement recess 351 of the screw member support portions 370 and 380. Therefore, by guiding the tool toward the engaging portion 340 by the guide surface 346, the tool can be easily engaged with the screwing member 330, and workability can be improved.

  Further, since the guide portion 342 has a curved surface 333 that is curved along the direction of rotation of the tool, when the tool is rotated in order to rotate the screwing member, when the tool moves in the radial direction, The movement is restricted by contacting the curved surface. As a result, the operator can appropriately and accurately rotate the tool to perform the tightening / loosening operation of the screwing member.

  As described above, the watt-hour meter 10 according to the present embodiment can prevent the screwing members 330 (330a and 330b) from dropping from the screwing member support portions 370 and 380. In addition, since the watt-hour meter 10 can easily guide the tool to the screwing member 330, the screwing member 330 can be easily tightened and loosened, and the metering unit 30 can be attached to and detached from the watt-hour main body base 20. Can be easily done.

  Note that the watt hour meter according to the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention. Moreover, it is needless to say that configurations, methods, and the like according to various modifications described below may be arbitrarily selected and employed in the configurations, methods, and the like according to the above-described embodiments.

  Although the latching | locking part 340 which concerns on the said embodiment showed the guide part 34, and the guide part 342 showed the 1st guide part 343, the 2nd guide part 344, and the 3rd guide part 345, it was not restricted to this. The locking part 340 may have only a part of these.

  Further, in the watt-hour meter 10, the housing 360 may be configured so as not to be separated. Thereby, the screwing members 330a and 330b never fall off from the first screwing member support 370 and the second screwing member support 380, so that the metering unit 30 is attached to and detached from the watt-hour main body base 20. Can be made easier.

  Further, the first screwing member support portion 370 and the second screwing member support portion 380 may have a configuration in which the metering portion 30 is simply locked to the watt-hour main body base 20. In this case, the weighing unit 30 is electrically connected to the first power line 311, the second power line 312, and the conductive bar 130 separately from the first screw member support part 370 and the second screw member support part 380. It has a terminal to be connected. Thereby, the measuring unit 30 can be locked to the watt-hour main body base 20 without being influenced by the position of the end portion of the conductive bar 130. Therefore, the measuring unit 30 can adopt a shape with increased degrees of freedom.

  DESCRIPTION OF SYMBOLS 10 ... Electricity meter, 20 ... Electricity meter main body base, 30 ... Metering part, 110 ... Electric wire connection part, 131 ... 1st conductive bar, 132 ... 2nd conductive bar, 133 ... 3rd conductive bar, 134 ... fourth conductive bar, 135 ... fifth conductive bar, 136 ... sixth conductive bar, 137 ... seventh conductive bar, 330 (330a, 330b) ... screwing member (first screwing member, second screw Threaded member), 331... Threaded member head, 333. Curved surface, 340. Locking portion, 342. Guide portion, 346. Guide surface, 351. Engaging recess, 361 ... First housing, 362. 2 housings, 370... First screwing member support, 371... First insertion hole, 380... Second screwing member support, 381.

Claims (7)

A watt-hour meter comprising a watt-hour meter base and a packaged metering unit that is detachably attached to the watt-hour meter base.
The metering unit includes a screwing member support unit having an insertion hole through which a screwing member for fixing the metering unit to the watt hour meter base is inserted, and a predetermined length in the axial length direction of the insertion hole from the screwing member support unit. The further movement of the screwing member is restricted by contacting and locking with the head of the screwing member that is arranged at a distance of and moved in the removal direction, and the screwing member is supported by the screwing member support portion. A watt hour meter comprising: a locking portion that prevents the cap from falling off. The weighing unit is packaged by combining the first and second housings,
The screwing member support portion is provided on the first housing side, the locking portion is provided on the second housing side, and the locking portion is separated from the screwing member by separating the first and second housings. The watt-hour meter according to claim 1, configured as described above.   The screwing member support portion is configured as a terminal electrically connected to the electric wire so as to constitute a circuit for measuring the amount of electric power by the measuring portion. Electricity meter.   The watt-hour meter body base includes a wire connecting portion to which an electric wire is connected and a conductive bar for electrically connecting the wire connecting portion and the screwing member support portion, and one end of the conductive bar is connected to the wire connecting portion. The watt-hour meter according to claim 3, wherein the other end of the conductive bar is configured to be connected to the screwing member support through a screwing member.   The watt-hour meter according to any one of claims 1 to 4, wherein the locking portion includes a guide portion that guides a predetermined operation of a tool for operating the screwing member.   The screw member has an engaging recess with which the tool is engaged, and the guide portion has a guide surface for guiding the tool so that the tool is engaged with the engagement recess of the screw member. The watt-hour meter according to claim 5.   The screwing member has an engaging recess with which the tool is engaged, and the guide unit is configured to restrict the operation of rotating the screwing member by engaging the tool with the engaging recess of the screwing member. The watt-hour meter according to claim 5 or 6, further comprising a curved surface that curves along the direction of rotation of the tool.

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