JP3633411B2 - Electronic energy meter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic watt-hour meter that includes a display for displaying measurement data, a setting switch for setting measurement conditions, and the like, and is used for electricity billing or certification.
[0002]
[Prior art]
FIG. 7 is an exploded perspective view showing a conventional electronic watt-hour meter disclosed in, for example, Japanese Patent Laid-Open No. 5-188098. FIG. 8 is a perspective view showing a state where the external cover portion of the electronic watt-hour meter of FIG. 7 is opened. In the figure, reference numeral 1 denotes a housing, and 2 denotes a display unit composed of a liquid crystal or the like for displaying electric energy data. Reference numeral 3 denotes a setting switch unit, which includes a pulse setting switch 3a for setting weighting of the pulse train, a transformation ratio setting switch 3b, and a manufacturer setting switch 3c. 4 is a first printed wiring board on which the display 2 and the setting switch section 3 are mounted, 5 and 6 are second and third printed wiring boards on which electronic circuit components are mounted, and 7 is a voltage. And a terminal for inputting a current and outputting a pulse train to the outside. A measuring element unit 8 is configured by combining the display unit 2, the setting switch unit 3, the printed wiring boards 4, 5, 6 and the terminal unit 7, and is mounted inside the housing 1.
[0003]
Reference numeral 10 denotes an internal cover which is a transparent insulating cover. An opening 10a is formed at a position facing the setting switch unit 3, covers the first printed wiring board 4 on which the display unit 2 and the setting switch unit 3 are mounted. Provide mechanical insulation and mechanical protection. Reference numeral 11 denotes an auxiliary name plate formed of a plate-like material having elasticity, and is attached to the front surface 10 b of the inner cover 10. An external cover 12 has a pair of shafts 12a projecting on both sides of the upper end portion, and the shafts 12a are fitted in the pair of shaft holes 1a of the housing 1 so as to be freely opened and closed. Reference numeral 13 denotes a main name plate that displays a model name, rating items, and the like. The main name plate is formed of an elastic plate-like material, and is attached to an insertion groove (not shown) provided in the outer cover 12. Reference numeral 14 denotes a sealing screw, which is screwed into a fixing bracket 1 b having a female screw provided in the housing 1, and the external cover 12 is attached to the housing 1. The test sealing work is performed through a sealing ring (not shown) through a hole (not shown) of the sealing screw 14 and a sealing hole (not shown) provided in the housing 1.
[0004]
[Problems to be solved by the invention]
Since the conventional electronic watt-hour meter as described above has a structure covered with the outer cover 12, after the test seal (after tightening the sealing screw 14 to the housing 1, the hole of the sealing screw 14 and the housing 1 There is a problem that it is impossible to operate the setting switch 3 from the outside. For example, if the user operates the pulse setting switch 3a for setting the weighting of the pulse train, it is not possible to operate the pulse setting switch 3a after the verification seal even though it is outside the verification target.
[0005]
The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain an electronic watt-hour meter capable of operating a setting switch that can be set and operated from the outside after seal sealing.
[0006]
[Means for Solving the Problems]
An electronic watt-hour meter according to the present invention is an electronic watt-hour meter that inputs voltage and current, measures the amount of power, and outputs a pulse train proportional to the amount of power. One setting operation section, a second setting operation section that can be set and operated after the test seal, and an outside that covers the first and second setting operation sections provided with a through hole at a position facing the second setting operation section And a cover.
[0007]
Further, the outer cover is provided with a partition wall that separates the first setting operation unit and the second setting operation unit.
[0008]
The partition wall is provided at a position surrounding the through hole of the outer cover.
[0009]
In addition, an internal cover that covers the first and second setting operation portions is provided, and a through hole is provided at a position facing the second setting operation portion of the internal cover, and protrudes toward the outer cover at a position surrounding the through hole. A partition wall is provided.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is an exploded perspective view of an electronic watt-hour meter showing Embodiment 1 of the present invention. FIG. 2 is a perspective view showing an external cover portion of the electronic watt-hour meter of FIG. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a perspective view showing a state before the external cover part of the electronic watt-hour meter is attached. FIG. 5 is a perspective view showing a state in which the external cover portion of the electronic watt-hour meter is opened.
[0011]
In the figure, reference numerals 1 to 8 are the same as those in the conventional apparatus, and the description thereof is omitted. In FIG. 1, reference numeral 18 denotes a first setting operation unit that performs a setting operation before the test seal, and includes, for example, a plurality of transformation ratio setting switches 18a and a manufacturer setting switch 18b. Reference numeral 19 denotes a second setting operation unit which can be set and operated after the test seal, for example, a pulse setting switch for the user to set weighting such as a pulse train. Reference numeral 20 denotes an inner cover, which is formed of a transparent polycarbonate resin or the like, and has an opening 20a formed at a position facing the second setting operation section 19 and a plurality of openings formed at positions facing the first setting operation section 18. The parts 20b, 20c, and 20d are formed to cover the first printed wiring board 4 on which the display 2 and the setting operation parts 18 and 19 are mounted, and are electrically insulated and mechanically protected. Reference numeral 21 denotes an auxiliary name plate formed of a plate-like material having elasticity. The auxiliary name plate 21 has a plurality of through holes 21 a at positions facing the setting switches 18 a, 18 b, and 19 and is attached to the front surface portion 20 e of the inner cover 20. . In some cases, the auxiliary name plate 21 directly prints the items described on the front surface portion 20e of the inner cover 20.
[0012]
Reference numeral 22 denotes an external cover, which is formed of, for example, a transparent polycarbonate resin. As shown in FIGS. 2 and 3, a through-hole 22a that allows the second setting operation unit 19 to be operated from the outside after sealing the seal, and this penetration A partition wall 22b protruding inward of the outer cover 22 so as to surround the hole 22a, a groove 22c into which a main name plate 23 to be described later is inserted, a screw hole 22d through which a sealing screw 24 is passed, and a housing on both sides of the upper end portion A pair of shafts 22e is formed to be fitted to a pair of shaft holes 1a so as to be freely opened and closed. Reference numeral 23 denotes a main name plate for displaying a model name, rated items, and the like, which is formed of an elastic plate-like material, and is fitted into a pair of insertion grooves 22 c provided in the outer cover 22. The outer cover 22 and the main name plate 23 constitute an outer cover portion 25.
[0013]
As shown in FIG. 2, the through hole 22 a of the outer cover 22 is provided at a position where the second setting operation unit 19 can be operated, and the partition wall 22 b is disposed so as to surround the second setting operation unit 19. In addition, with the outer cover 22 closed, the front end surface of the partition wall 22b contacts the inner cover 20 or the auxiliary name plate 21 or is formed so as to have a slight gap. Further, the main name plate 23 attached to the inside of the outer cover 22 is formed in a shape that avoids the areas of the through holes 22a, the partition walls 22b, and the sealing portion when viewed from the front of the electronic watt-hour meter.
[0014]
A method for assembling the electronic watt-hour meter of the present invention will be described. In FIG. 1, first, the unitized measuring element unit 8 is assembled inside the housing 1, and the measuring element unit 8 is attached to the bottom 1 c of the housing 1 with a mounting screw (not shown). Next, the display unit 2, the setting operation units 18 and 19 and the first printed wiring board 4 are electrically insulated from the outside, and the inner cover 20 is mechanically protected. Next, the auxiliary name plate 21 is affixed to the front surface portion 20e of the inner cover 20, and the assembled state shown in FIG. 4 is obtained.
[0015]
Next, the pair of shafts 22e of the outer cover 22 to which the main name plate 23 is attached are fitted in the pair of shaft holes 1a of the housing 1 so as to be freely opened and closed, whereby the assembled state shown in FIG.
The electronic watt-hour meter is adjusted to have a predetermined performance in this state, and after passing the verification test after various properties, the external cover portion 25 is fixed to the housing 1 with the sealing screw 24. A sealing ring (not shown) is passed through the hole 24a of the sealing screw 24 and the sealing hole (not shown) of the housing 1 and is sealed.
[0016]
The electronic watt-hour meter assembled as described above and sealed after the verification test transmits the pulse output from its terminal section 7 to a remote location and measures the amount of power used by a counter (not shown). There is. In this case, the setting value of the pulse setting switch which is the second setting operation unit 19 can be changed from the outside so that the user can change the weighting (pulse unit) of the pulse train according to the power consumption. ing. Further, since the operation of the second setting operation unit 19 does not affect the amount of power used for power trading displayed on the display device 2, it is defined as not subject to verification.
[0017]
According to the configuration of the electronic watt-hour meter configured as described above, the through hole in which the second setting operation unit 19 can be operated from the outside at a position facing the second setting operation unit 19 of the outer cover 22. Since 22a is provided, the pulse setting switch which is the second setting operation unit 19 can be operated from the outside after the seal verification.
[0018]
In addition, since the partition wall 22b is disposed so as to surround the through hole 22a and the second setting operation unit 19, the boundary between the inner side and the outer side of the verification seal (responsibility demarcation point) at the time of verification and after sealing. The inside of the partition 22b including the through-hole 22a that can be operated from the outside by sealing is defined as the outside of the verification seal, and the outside of the partition 22b that cannot be operated from the outside is defined as the inside of the verification seal. ) Can be clarified. Further, the strength of the outer cover 22 is increased.
[0019]
Further, the front end surface 22f of the partition wall 22b is in contact with the inner cover 20 or the auxiliary name plate 21 with the outer cover 22 closed, or is formed so as to have a minute gap. Invasion of dust and insects can be reduced.
[0020]
Embodiment 2. FIG.
6 is an exploded perspective view of an electronic watt-hour meter showing Embodiment 2 of the present invention. In the figure, 1 to 8, 18, 19, 23, and 24 are the same as those in the first embodiment, and the description thereof is omitted. Reference numeral 30 denotes an inner cover, which is formed of a transparent polycarbonate resin or the like. A through hole 30a is formed at a position facing the second setting operation unit 19, and the direction of the outer cover 32 to be described later so as to surround the through hole 30a. A partition wall 30b protruding to the inside of the outer cover 32 or having a small gap is formed, and a plurality of openings 30c, 30d, 30e are formed at positions facing the first setting operation unit 18, 2 and the first printed wiring board 4 on which the setting operation units 18 and 19 are mounted are covered and electrically insulated and mechanically protected.
[0021]
Reference numeral 31 denotes an auxiliary name plate formed of a plate-like material having elasticity. A position facing the partition wall 30b of the inner cover 30 is cut away, and a plurality of through holes 31a are formed at positions facing the setting switches 18a and 18b. And is attached to the front surface portion 30 f of the inner cover 30. In some cases, the auxiliary name plate 31 directly prints items described on the front surface portion 30 f of the inner cover 30. Reference numeral 32 denotes an outer cover, which has the same shape as that obtained by removing the partition wall 22b of the cover 22 shown in FIGS. The outer cover 32 and the main name plate 23 constitute an outer cover portion 35.
[0022]
According to the configuration of the second embodiment, the through hole 30a is formed at a position facing the second setting operation unit 19 of the inner cover 30, and protrudes in the direction of the outer cover 32 described later so as to surround the through hole 30a. Since the partition wall 30b is formed, the same effect as in the first embodiment can be obtained. Furthermore, since the partition wall 30b can be seen with the external cover 22 opened during the certification test, the certification staff can easily recognize the inside and outside of the certification target.
[0023]
In the configurations of the first and second embodiments described above, the external covers 22 and 32 are configured to cover the entire display 2, the first setting operation unit 18, and the second setting operation unit 19, but are not illustrated. However, for example, a first external cover that covers the display 2 and the first setting operation unit 18 and a second external cover that covers the second setting operation unit 19 are provided, and only the first external cover is provided after the test. May be sealed. Alternatively, only the first outer cover may be provided and sealed, and the second setting operation unit 19 may be exposed to the outside. In this case, it is desirable to provide an internal cover 30 having a partition wall 30b as shown in FIG. 6 so that dust, insects, and the like are difficult to enter from the outside.
[0024]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0025]
According to the electronic watt-hour meter of the present invention, the first setting operation unit that is set and operated before the verification seal, the second setting operation unit that can be set and operated after the verification seal, and the second setting operation unit are opposed to each other. Since the through hole is provided at the position to be provided and the external cover that covers the first and second setting operation units is provided, the second setting operation unit can be operated from the outside after the seal test.
[0026]
In addition, since the outer cover is provided with a partition that separates the first setting operation section and the second setting operation section, the boundary (responsibility demarcation point) on the inside or outside of the test seal can be clarified, and from the outside It is possible to reduce the intrusion of dust and insects into the main body.
[0027]
Further, since the partition wall is provided at a position surrounding the through hole of the outer cover, it is possible to reduce the entry of dust, insects, and the like from the outside through the through hole.
[0028]
Furthermore, an internal cover that covers the first and second setting operation portions is provided, a through hole is provided at a position facing the second setting operation portion of the internal cover, and the position surrounding the through hole is directed toward the external cover. Since the protruding partition wall is provided, the boundary (responsibility demarcation point) between the inside and the outside of the test seal can be clarified, and the intrusion of dust and insects from the through hole into the main body can be reduced.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an electronic watt-hour meter showing Embodiment 1 of the present invention.
FIG. 2 is a perspective view showing an external cover portion of the electronic watt-hour meter according to Embodiment 1 of the present invention.
3 is a cross-sectional view taken along line III-III in FIG.
FIG. 4 is a perspective view showing a state before the external cover portion of the electronic watt-hour meter according to Embodiment 1 of the present invention is attached.
FIG. 5 is a perspective view showing a state where an external cover of the electronic watt-hour meter according to Embodiment 1 of the present invention is opened.
FIG. 6 is an exploded perspective view of an electronic watt-hour meter showing Embodiment 2 of the present invention.
FIG. 7 is an exploded perspective view showing a conventional electronic watt-hour meter.
FIG. 8 is a perspective view showing a state in which an external cover of a conventional electronic watt-hour meter is opened.
[Explanation of symbols]
18 First setting operation unit, 19 Second setting operation unit, 22 External cover,
22a through hole, 22b partition, 30 inner cover, 30a through hole,
30b Bulkhead.

Claims (4)

In an electronic watt-hour meter that inputs voltage and current, measures the amount of power, and outputs a pulse train that is proportional to this amount of power, the first setting operation unit that is set and operated before the verification seal, and the setting after the verification seal A second setting operation unit that can be operated, and an external cover that is provided with a through hole at a position facing the second setting operation unit and covers the first and second setting operation units. Electronic watt hour meter. The electronic watt-hour meter according to claim 1, wherein a partition for isolating the first setting operation unit and the second setting operation unit is provided on the outer cover. The electronic watt-hour meter according to claim 2, wherein the partition wall is provided at a position surrounding the through hole of the outer cover. An inner cover that covers the first and second setting operation portions is provided, a through hole is provided at a position facing the second setting operation portion of the inner cover, and a partition wall that protrudes toward the outer cover at a position surrounding the through hole The electronic watt-hour meter according to claim 1, wherein:

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