JP2005274203A - Watt-hour meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure capable of fixing surely a communication cable without contact between a plug socket terminal (charging part) of a watt-hour meter with communication function and the communication cable. <P>SOLUTION: This watt-hour meter with communication function has a constitution wherein the plug socket terminal (charging part) 22 and the communication cable 30 are disposed separately on the surface and the back of a separation cover 10 by using the separation cover 10 formed from an insulating material, and a groove 11 for the communication cable is provided on the surface side of the separation cover 10 and the communication cable 30 is arranged in the inter-fitted state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an arrangement of a communication cable for transmitting a measured electric energy to the outside, for example, in an energy meter with a communication function.

  As a watt-hour meter with a communication function, there are meters such as an automatic meter reading meter or a composite meter, but usually a dedicated communication terminal is provided together with a power supply terminal and a load terminal. (For example, refer to Patent Document 1). Therefore, when the communication function is unnecessary, it is necessary to manufacture another watt-hour meter. As a countermeasure, it is considered to make each function such as a measurement unit and a communication unit into a plug-in module. However, special consideration is required for the communication line between the communication module and the communication terminal.

JP 2002-365314 (paragraph 0021, FIG. 6)

  The problem to be solved is that the cable for communication from the inside of the watt hour meter to the outside can be arranged without contacting the charging part of the watt hour meter. Also, the communication cable should not cause any problems if it is pulled or pushed in from the outside. Furthermore, even when a communication function is not required, the configuration can be used as a normal watt-hour meter.

  In the watt-hour meter according to the present invention, the charging unit and the communication cable of the watt-hour meter are separated and arranged on the front and back surfaces of the isolation cover by the isolation cover formed of an insulating material, and on the surface of the isolation cover. The main feature is that a communication cable groove is provided and the cable is fitted and arranged.

  The watt-hour meter of the present invention is provided with an isolation cover made of an insulating material in front of a charging portion such as an outlet terminal for connecting each unit inside the watt-hour meter. Various units do not come into contact with the external communication cable, and fixing the communication cable in the wiring groove of the isolation cover prevents problems even if the communication cable is pulled or pushed in from the outside. There are advantages such as not occurring. Furthermore, since a dedicated terminal fitting is not required for drawing out the communication cable from the terminal box, the base portion can be used for other instruments.

Embodiment 1 FIG.
1 to 6 show an embodiment of a watt-hour meter according to Embodiment 1 of the present invention. In the figure, the isolation cover 10 is formed of, for example, a thermoplastic synthetic resin material. In this isolation cover 10, the communication cable groove 11 for fitting and arranging the communication cable 30 shown in FIG. 2 and the plugs of the electric energy measuring unit 42, the communication unit 43, and the switch unit 44 shown in FIG. The insertion guides 12, 13, and 14 through which the terminals 42a, 43a, and 44a (43a and 44a are not shown) pass, the mounting holes 17, and the like are provided. In addition, the insertion guide 12 is an insertion guide for electric energy measuring units, the insertion guide 13 is an insertion guide for communication units, and the insertion guide 14 is an insertion guide for switch units.

  The base part 20 is formed of a metal plate, and a terminal box 23 formed of a thermosetting synthetic resin article is provided at one end. The terminal box 21 is provided with a terminal fitting 21 for connecting to a power supply circuit and a load circuit, a cable stopper 24 for drawing the communication cable 30 to the outside, and the like. An insulating insole 19 formed of the same thermoplastic synthetic resin material as that of the isolation cover 10 is provided on the bottom surface of the base portion 20. The insulating insole 19 is fixed by being press-fitted into a protrusion (not shown) provided on the base portion 20. On the insulating insole 19, plug terminals 42a, 43a, 44a (43a, 44a are omitted in the drawing and reference numerals) of the electric energy measuring unit 42, the communication unit 43, and the switch unit 44 are plugged and connected. 22 is disposed. The outlet terminals 22 are connected to the terminal fittings 21, but the charging portions including the respective outlet terminals 22 are fixed to a protrusion (not shown) formed on the insulating insole 19 by means such as press fitting. In addition, the base plate 20 is electrically insulated from the metal plate portion.

  In this embodiment, the plug terminals 42a, 43a, 44a of the electric energy measuring unit 42, the communication unit 43, and the switch unit 44 are formed as blade-shaped plug terminals. Therefore, the outlet terminal 22 is an outlet terminal using a blade receiving spring as shown in the figure. As this type of terminal, a blade-type plug terminal and an outlet terminal using a blade receiving spring are suitable. However, depending on the structure or the rated current, a terminal such as a tulip terminal may be used. Good.

  The isolation cover 10 is fixed to the front surface of the base portion 20 as shown in FIG. This fixing may be performed by screwing the periphery of the isolation cover 10, but in this embodiment, a latch (not shown) is provided with a latch hole 10 a formed in the upper side of the isolation cover 10 in the insulating insole 19. 2) and is screwed to the base portion 20 through the lower mounting hole 10b. On the surface of the isolation cover 10, there is formed a communication cable groove 11 in which a communication cable 30 for guiding a measurement signal output from a communication unit 50 described later is led out. The communication cable groove 11 is formed in a meandering groove having a width of 10 mm and a depth of 10 mm. In addition, as the communication cable 30 with respect to this communication cable groove | channel 11, it has the connector 31 for connecting with the communication unit 50 at the front-end | tip using the 600V 2 type vinyl insulated wire whose finishing outer diameter is 6-8 mm, for example. In addition, an outlet terminal holding portion (not shown) for holding the distal end position of the outlet terminal 22 is formed on the back side of the insertion guides 12, 13, 14 that are penetrated at a position corresponding to the outlet terminal 22. ing.

In the isolation cover 10 described above, the communication cable groove 11 may be a groove formed in a straight line when it cannot be a meandering groove because of its structure. Further, an extended recess 16 formed larger than the width of the communication cable groove 11 may be formed at the tip of the communication cable groove 11. The expansion recess 16 is used when the communication unit 50 is attached to the front surface of the isolation cover 10 after the connector 31 of the communication cable 30 is inserted into the insertion port provided on the back surface or side surface of the communication unit 50. The part can be stored. Therefore, there is an effect in terms of appearance design and prevention of disconnection of the communication cable 30.
If the communication cable groove 11 is meandered as shown in FIG. 2, for example, to form the locking portion 11a, the cable 30 can be pulled even if it is pulled or pushed in. Since it can disperse | distribute by the part 11a, generation | occurrence | production of problems, such as damage to an instrument, can be suppressed.

  The cable stopper 24 for pulling out the communication cable 30 to the outside is configured as shown in FIG. That is, after inserting the communication cable 30 by an appropriate length into the base portion 20, the cable stopper 24 is inserted and attached to the communication cable 30. The cable stopper 24 is fixed by inserting the cable stopper 24 into the insertion hole 23 a of the terminal box 23 and snap-fitting the claw 24 a with the engaging hole 23 b of the terminal box 23. According to the cable stopper 24, the communication cable 30 is fixed at a predetermined length, and therefore, there is an effect of preventing disconnection and disconnection even when the communication cable 30 receives a tensile force from the outside. Further, since the cable stopper 24 is configured to press-fit and fix the communication cable 30 in the U groove 24c for fitting the communication cable 30 on the lower end surface 24b, dust, insects, etc. from the outside of the watt hour meter Intrusion can be prevented.

  Next, the electric energy measuring unit 42, the communication unit 43, and the switch unit 44 built in the watt hour meter of the present invention will be described. The electric energy measuring unit 42 is an electronic watt hour meter with a transmitter, and as shown in FIGS. 4 and 5, the outer periphery is formed in a box shape, and a display unit 42b for displaying the measured electric energy is provided on the front surface. The blade-shaped plug terminal 42a is provided on the back surface. Also, attachment holes 47 are provided at both ends. The plug terminal 42a may be connected to the power circuit from the outlet terminal 22 via the terminal box 23, or may be connected to the load circuit via the terminal box 23 from a switch unit 44 described later. Internally, an electric energy measurement circuit and a transmission device that converts the measurement amount into a signal and transmits the signal for each predetermined relationship such as a predetermined time period or a unit measurement amount are provided.

  As shown in FIG. 5, the communication unit 43 is formed in a box shape on the outer periphery, and a blade-shaped plug terminal 43 a (not shown) similar to that of the power amount measurement unit 42 is provided on the back surface. Also, attachment holes 47 are provided at both ends. The plug terminal 43a is connected from the outlet terminal 22 to the power supply circuit via the terminal box 23. Inside, there are provided a receiving circuit for receiving a signal transmitted from the electric energy measuring unit 42, a communication circuit for communicating the received signal to the outside, and the like. There are various means for receiving the signal transmitted from the power measurement unit 42 described above, but means for receiving by optical communication is appropriate.

  As shown in FIG. 5, the switch unit 44 is formed in a box shape on the outer periphery, and a blade-shaped plug terminal 44 a (not shown) similar to that of the electric energy measuring unit 42 is provided on the back surface. Also, attachment holes 47 are provided at both ends. The plug terminal 44a (not shown) is connected to the load-side plug terminal 42a among the plug terminals 42a of the electric energy measuring unit 42 and connected to the load circuit via the terminal box 23. There is. Inside, a switch for opening and closing between the electric energy measuring unit 42 and the load circuit, an opening and closing means and the like are provided. The opening / closing means (not shown) may be manually operated, but there is also a means using an external signal.

  In the power amount measuring unit 42, the communication unit 43, and the switch unit 44, the power amount measuring unit 42 and the communication unit 43 may be integrally configured. In addition, the watt-hour meter from which the switch unit 44 is removed is possible, but conversely, in addition to these units, a meter to which a unit such as a reactive watt-hour meter is added may be used.

  In the above-described electric energy measuring unit 42, communication unit 43, and switch unit 44, the plug terminals 42 a, 43 a, 44 a are plugged into the outlet terminal 22 through the insertion guides 12, 13, 14 of the isolation cover 10. Then, the unit screw 57 is fixed to the base portion 20. The communication cable 30 is connected to the communication unit 43 by a connector 31. FIG. 5 shows a state where the electric energy measuring unit 42, the communication unit 43, and the switch unit 44 are fixed to the base unit 20.

  FIG. 6 is a perspective view of the watt hour meter in which the glass cover 60 is fixed to the base portion 20 with the glass cover screw 61 in the state of FIG. Although the terminal box 23 is configured to be covered with a terminal cover, the terminal cover is not shown.

  As described above, the charging unit such as the outlet terminal 22 is arranged on the back side of the isolation cover 10 and the communication cable 30 is arranged on the front side, so that an accident caused by the contact between the charging unit such as the outlet terminal 22 and the communication cable 30 can be suppressed. . Further, by providing the power amount measuring unit 42, the communication unit 43, and the switch unit 44 on the surface side of the isolation cover 10, the wiring groove 11 and the cable 30 can be covered. Therefore, when inserting each unit such as the electric energy measuring unit 42, it is excellent in terms of preventing disconnection of the communication cable 30 or in appearance design, as well as not exposing the charging part such as the outlet terminal 22; There is also an effect of preventing the communication cable 30 from dropping from the wiring groove 11.

Embodiment 2. FIG.
In the configuration of the first embodiment, the communication cable 30 has been described so as to use a 600V type 2 vinyl insulated wire having a finished outer diameter of 6 to 8 mm. However, in the case of a cable having a finished outer diameter of less than 6 mm, the width is 10 mm and the depth. The groove size of the communication cable groove 11 of 10 mm is too large. Therefore, as shown in FIG. 7, a projection 15 is provided so that the communication cable 32 having a finished outer diameter of less than 6 mm can be hooked on the side of the communication cable groove 11, and the communication cable is bypassed by bypassing the projection 15. It is good to absorb the force with respect to the drawing of 32. Even if the communication cable 32 is pulled or pushed from the outside, the force can be distributed by the protrusions 15, so that problems such as damage to the communication cable 32 or the instrument can be suppressed.

Embodiment 3 FIG.
FIG. 8 shows a third embodiment of the present invention. In FIG. 8, a groove cover 70 that covers the communication cable groove 11 is attached to the isolation cover 10. Thus, by attaching the groove lid 70, the communication cables 30 and 32 can be removed from the communication cable groove 11 even when the power amount measurement unit 42, the communication unit 43, and the switch unit 4 are removed. The problem can be solved. Also, an excellent instrument can be obtained in appearance design. The groove lid 70 is formed of an insulating plate and can be attached and detached. In this case, it is desirable to provide a step on the surface of the isolation cover 10 so that the surface of the isolation cover 10 and the surface of the groove lid 70 are “smooth”.

It is a disassembled perspective view of the base part of the watt-hour meter which shows Embodiment 1 of this invention. It is a perspective view of the base part of the watt-hour meter which shows Embodiment 1 of this invention. It is a perspective view of the cable stopper which fixes a communication cable to a terminal box. It is a perspective view of the back of an electric energy measuring unit. It is a perspective view of the state which connected each unit to the base part which shows Embodiment 1 of this invention. It is a perspective view of the external appearance of the watt-hour meter which shows Embodiment 1 of this invention. It is a perspective view for explanation of the projection in Embodiment 2 of the present invention. It is a perspective view for explanation of a groove lid in Embodiment 3 of the present invention.

Explanation of symbols

10 Separation cover, 11 Groove for communication cable, 12 Insertion guide for electric energy measuring unit, 13 Insertion guide for communication unit, 14 Insertion guide for switch unit,
15 protrusion, 16 expansion recess, 20 base, 21 terminal fitting,
22 outlet terminal (charging part), 23 terminal box, 24 cable stopper,
30 communication cable, 31 connector, 42 energy measuring unit,
42a plug terminal, 43 communication unit, 44 switch unit,
60 glass cover, 70 groove lid.

Claims (6)

  A base portion having a terminal box that can be connected to an external power supply circuit and load circuit at one end, an outlet terminal disposed on the bottom surface of the base portion and connected to a terminal fitting of the terminal box, and a synthetic resin material The insertion guide penetrated at a position corresponding to the outlet terminal, a separation cover having a communication cable groove on the front side and fixed to the base portion, and a plug terminal provided on the back side. Is connected to the outlet terminal via the power supply, and is configured to measure the electric energy of the load circuit and transmit a signal corresponding to the electric energy for each predetermined time period or unit relationship. A unit and a signal transmitted from the watt-hour meter unit with a communication function by being inserted into the communication cable groove and pulled out through the terminal box. Power meter comprising a communication cable that is adapted to transmit to the outside.   The watt-hour meter according to claim 1, wherein the communication cable groove is formed in a meandering shape.   The watt-hour meter according to claim 2, wherein the communication cable groove is formed to have a meandering shape suitable for a thin communication cable by providing a protrusion in a part of the groove.   The watt-hour meter according to any one of claims 1 to 3, wherein the communication cable groove is provided with an expansion recess at a tip of the communication cable groove.   2. The power consumption measuring unit with a communication function is configured to be covered by the power measurement unit with a communication function when the power measurement unit with a communication function is inserted and connected. The watt-hour meter as described in any one of thru | or 4.   The watt-hour meter according to any one of claims 1 to 4, wherein the communication cable groove is closed with a groove lid.

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