JP2015222213A - Watt-hour meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a watt-hour meter that can be produced with reduced number of components and assembly man-hours, and has improved waterproofness.SOLUTION: A watt-hour meter includes: a base 13a having an insert-molded sealing part 33 for fixing a power distribution line; a case 10a housing the base 13a, and having a groove part 31 formed therein through which the sealing part 33 is inserted; and a sealing cap 23 for covering the sealing part 33 inserted through the groove part 31 formed in the case 10a.

Description

  The present invention relates to a watt-hour meter having a sealing portion.

  The watt hour meter is configured to include a base for fixing the power distribution line and a case for storing the base. Such a watt-hour meter has a sealing part for sealing the case and the base.

  FIG. 7 is a perspective view of a conventional watt-hour meter having a sealing structure. 7A and 7C show a state in which the terminal cover 11 is attached to the case 10, FIG. 7B shows a state in which the base 13 is stored in the case 10, and FIG. Indicates.

  FIG. 8 is an exploded view of the conventional watt-hour meter shown in FIG. The circuit unit 14 having the display unit 15 for displaying the electric energy is housed in the case 10. A sensor part 17 for detecting a current flowing through the conductor part 16 is attached to the conductor part 16.

  Of the four conductor portions 16, the left two conductor portions 16 are attached with power supply side terminals for fixing the distribution lines from the power supply side. A load side terminal for fixing a distribution line to a consumer is attached to the two right conductor portions 16. The conductor portion 16 is housed in the base 13, and the terminal cover 11 covers the base 13 and is attached to the case 10. A switch unit 18 is attached to the circuit unit 14.

  Moreover, the watt-hour meter is sealed as follows. That is, the insert part 19 made of a female screw is press-fitted into the hole 20 formed in the base 13, and the sealing part 21 made of one or more male screws is passed through the hole 22 formed in the case 10, so that the case 10 and the base 13 Is fixed by tightening the male screw of the sealing portion 21 to the female screw of the insert part 19. Then, a sealing cap 23 is attached to the screw head of the sealing portion 21, or a wire (not shown) is passed through the screw head of the male screw and the case 10 and sealed.

  In addition, as a prior art, the technique described in patent document 1 and patent document 2, for example is known.

JP 2006-275800 A JP 2005-322123 A

  However, in the production of the watt-hour meter, the cost has been increased due to an increase in the number of insert parts 19 that are female screw parts, an increase in post-processing of hot-pressing the insert part 19 into the base 13, and an increase in the process of tightening the screws.

  In addition, the waterproof performance of the watt-hour meter has a structure in which water flows from the base 13 to the lower terminal cover 11 because water permeates around the screw tightening portion of the male screw and the female screw. However, when water with a high water pressure enters, there is a concern that the water rises above the base 13 and enters the circuit portion inside the base.

  The subject of this invention provides the watt-hour meter which can reduce a number of parts and an assembly man-hour, and can improve waterproofness.

  In order to solve the above-mentioned problems, the invention of claim 1 according to the present invention includes a base having a sealing portion fixed to an electric power distribution line and insert-molded, and a groove portion that houses the base and penetrates the sealing portion. And a sealing cap that covers the sealing portion that penetrates the groove formed in the case.

  The invention according to claim 2 is characterized in that a gap is provided in a part of a joint portion between the sealing cap and the case.

  The invention of claim 3 is characterized in that a step portion is provided around the sealing portion between the base and the case.

  The invention according to claim 4 is characterized in that the case is formed with a rib covering the periphery of the sealing portion.

  The invention of claim 5 is characterized in that a plurality of each of the sealing part, the groove part and the sealing cap are provided.

  According to the present invention, since the insert-molded sealing part of the base is passed through the groove part formed in the case and the sealing part is covered with the sealing cap, it is possible to provide a watt-hour meter that can reduce the number of parts and assembly man-hours. Can do.

It is a whole block diagram and exploded view of a watt-hour meter concerning Example 1 of the present invention. It is an exploded view of the watt-hour meter which concerns on Example 1 of this invention. It is a perspective view of the watt-hour meter which concerns on Example 2 of this invention. It is a whole block diagram and exploded view of the watt-hour meter which concerns on Example 3 of this invention. It is an exploded view of the watt-hour meter which concerns on Example 3 of this invention. It is a perspective view of the watt-hour meter which concerns on Example 4 of this invention. It is a perspective view of the conventional watt-hour meter which has a sealing structure. It is an exploded view of the conventional watt-hour meter shown in FIG.

  Hereinafter, the watt-hour meter which concerns on embodiment of this invention is demonstrated in detail, referring drawings.

  FIG. 1 is an overall configuration diagram and an exploded view of a watt-hour meter according to Embodiment 1 of the present invention. FIG. 2 is an exploded view of the watt-hour meter according to the first embodiment of the present invention. 1A is a view showing a state in which a base 13a is attached to the case 10a, FIGS. 1B and 2A are views showing the case 10a, and FIGS. 1C and 2B are bases. FIG. 1D is a cross-sectional view of the sealing portion 33 formed by insert molding.

  As shown in FIG.1 (b), the base 13a has the sealing part 33 insert-molded while fixing an electric power distribution line. As shown in FIGS. 1C and 1D, the sealing portion 33 is inserted into a protruding portion 32 formed on the base 13a.

  A case 10a shown in FIG. 1 (a) houses a base 13a shown in FIG. 1 (c) and has a U-shaped groove 31 for penetrating the sealing portion 33, and a protrusion 32 formed on the base 13a. And a notch 100 to be fitted. The sealing cap 23 covers the sealing portion 33 penetrating the groove portion 31 formed in the case 10a.

  The circuit unit 14 includes a display unit 15 that displays the amount of power. A sensor part 17 for detecting a current flowing through the conductor part 16 is attached to the conductor part 16. The conductor part 16 and the circuit part 14 are accommodated in the base 13a.

  According to the watt-hour meter according to the first embodiment configured as described above, the insert-molded sealing portion 33 included in the base 13a is inserted into the groove portion 31 formed in the case 10a so as to pass therethrough and is formed in the base 13a. The protrusion 32 thus formed is fitted to the notch 100 formed in the case 10a. Thereafter, the sealing portion 33 is covered with the sealing cap 23, whereby a sealing structure as shown in FIG. Therefore, it is possible to provide a watt-hour meter that can reduce the number of parts and the number of assembly steps.

  FIG. 3 is a perspective view of the watt hour meter according to the second embodiment of the present invention. The watt-hour meter according to the second embodiment shown in FIG. 3 is a concave gap portion at a part of the joint portion between the sealing cap 23 and the case 10b, compared to the watt-hour meter according to the first embodiment shown in FIG. 34 is provided.

  According to such a configuration, the sealing cap 23 can be easily removed by inserting a jig such as a screwdriver into the concave gap 34 and using the lever principle. The effect of the watt-hour meter according to the first embodiment can also be obtained by the watt-hour meter according to the second embodiment.

  FIG. 4 is an overall configuration diagram and an exploded view of a watt-hour meter according to Embodiment 3 of the present invention. FIG. 5 is an exploded perspective view of the watt-hour meter according to the third embodiment of the present invention. 4A shows a state in which the base 13b is attached to the case 10b, FIGS. 4B and 5A show the case 10b, and FIGS. 4C and 5B show the base. FIG. 4D is a cross-sectional view around the sealing portion formed by insert molding.

  A base convex portion 35 and a base concave portion 36 are formed on the base 13b, and the sealing portion 33 is inserted into the base convex portion 35 as shown in FIG. The base convex portion 35 and the base concave portion 36 are fitted into a groove portion 31 formed in the case 10b.

  Further, the case 10 b is formed with a first front surface portion 38 joined to the sealing cap 23, and a second front surface portion 39 having a stepped portion 37 behind the first front surface portion 38. The step portion 37 is provided around the sealing portion 33.

  According to the watt-hour meter according to the third embodiment configured as described above, since the step portion 37 is provided around the sealing portion 33 between the base 13a and the case 10b, water can be forced to flow downward. For this reason, since water does not enter the circuit portion 14 in the base, the waterproof property can be improved. In addition, the watt-hour meter according to the third embodiment can also achieve the effect of the watt-hour meter according to the first embodiment.

  FIG. 6 is a perspective view of the watt hour meter according to the fourth embodiment of the present invention. The watt-hour meter according to the fourth embodiment shown in FIG. 6 is characterized in that, in addition to the watt-hour meter according to the first embodiment shown in FIG. 1, a rib 40 that covers the periphery of the sealing cap 23 is formed on the case 10c. And

  According to such a configuration, since the rib 40 covering the periphery of the sealing cap 23 is formed on the case 10c, it is possible to prevent the seal from being damaged due to an impact from the outside, and the removal of the sealing due to a third party's mischief. The effect of the watt-hour meter according to the first embodiment can also be obtained by the watt-hour meter according to the fourth embodiment.

  In addition, this invention is not limited to the watt-hour meter of Example 1 thru | or Example 4 mentioned above. In the first to fourth embodiments, each of the sealing portion 33, the groove portion 31, and the sealing cap 23 is provided. For example, a plurality of the sealing portion 33, the groove portion 31, and the sealing cap 23 are provided. May be. In this way, the effect is further increased.

  Further, two or more embodiments of the watt-hour meter of Embodiments 1 to 4 may be combined. In this way, the effect is further increased.

10, 10a, 10b Case 11 Terminal cover 13, 13a Base 14 Circuit part 15 Display part 16 Conductor part 17 Sensor part 18 Switch part 19 Insert part
20, 22 Holes 21, 33 Sealing part 23 Sealing cap 31, 31b Groove part 31a Projection part 32 Projection part 34 Gap part 35 Base convex part 36 Base concave part 37 Step part 38 First front part 39 Second front part 40 Rib

Claims (5)

A base having a sealing portion that is fixed to the power distribution line and insert-molded;
A case in which a groove portion is formed to house the base and penetrate the seal portion;
A sealing cap that covers the sealing portion that penetrates the groove formed in the case;
A watt-hour meter comprising:   The watt-hour meter according to claim 1, wherein a gap is provided in a part of a joint portion between the sealing cap and the case.   The watt-hour meter according to claim 1, wherein a step portion is provided around the sealing portion between the base and the case.   The watt-hour meter according to any one of claims 1 to 3, wherein a rib that covers the periphery of the sealing cap is formed in the case.   The watt-hour meter according to any one of claims 1 to 4, wherein a plurality of each of the sealing part, the groove part, and the sealing cap are provided.

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