JP4929094B2 - Electricity meter - Google Patents

Description

  The present invention relates to a watt hour meter for measuring power consumption in a consumer, and more particularly to a technique for protecting the inside of a watt hour meter from flooding.

  In recent years, with the spread of electronic watt-hour meters, the cost reduction is required. In addition, as a recent trend, design of the watt-hour meter housing is also required. In a case where a conventional metal material is processed and manufactured, it is difficult to realize a reduction in cost and an improvement in design. Therefore, the case is manufactured using a plastic material.

  For example, a watt-hour meter disclosed in Patent Document 1 includes a power measurement unit including a power measurement circuit and a display circuit for displaying a power amount, and a power supply side and a load side fixed to the power measurement unit. A test seal cover and a power seal cover are provided to cover the terminal box that relays the power line.

The test seal cover and the power seal cover are made of a material having weather resistance that can withstand the installation environment in the customer for a long period of time, for example, polycarbonate, and protect the electronic circuit and the display unit of the power measurement unit over a long period of time. It has a structure that can ensure sealing and waterproofing. The test seal cover and the power seal cover are formed so as to be fitted to each other at the portion abutting on the terminal box, and assembly is performed by laying a packing and an O-ring (not shown) around the fitting portion. It is possible to achieve a sealing structure that is easy to handle.
JP 2004-245704 A

  However, in the above-described conventional watt-hour meter, if it is attempted to achieve cost reduction and improvement in design using a plastic material with a waterproof structure using packing or the like, the plastic material is deteriorated due to the influence of packing or the like, There is a problem that its realization is difficult.

  The present invention has been made in order to solve the above-described problems, and the problem is that power that can improve the waterproof performance of a casing that is made of plastic material and is reduced in cost and improved in design. To provide a meter.

  In order to solve the above-described problems, the present invention provides an internal component including an electronic circuit and a display, and an internal component cover that accommodates the internal component, and extends outward from a side surface and has a tip portion bent downward. Is formed integrally with the internal component cover provided with a terminal, and includes a terminal block having terminals for connecting to a power source and a load, a case for accommodating the internal component cover in which the internal components are accommodated, and a case fitted therein A terminal cover that covers the terminal block, and the terminal cover has an end portion of the terminal cover that enters the inside of the end portion of the case and fits into the case, and an overhang portion provided on the internal component cover. The portion bent downward is sandwiched between the end portion of the case and the end portion of the terminal cover.

  Further, the present invention provides an internal component including an electronic circuit and a display, and an internal component cover that accommodates the internal component, and includes an extended portion that protrudes outward from a side surface and is bent downward at a tip portion. A terminal cover comprising a component cover, a terminal block having terminals connected to a power source and a load, a case accommodating an internal component cover in which internal components are accommodated, and a terminal cover fitted to the case and covering the terminal block. The end portion of the terminal cover enters the inside of the end portion of the case and fits into the case, and the portion bent below the overhang portion provided in the internal component cover is the end portion of the case. It is characterized by being sandwiched between the end portions of the terminal cover.

  According to the present invention, the terminal cover has an end portion that enters the inside of the end portion of the case and fits with the case, and a portion that is bent below the overhang portion provided in the internal component cover. Since it is sandwiched between the end of the case and the end of the terminal cover, even if water enters from the outside, it passes between the case and the part bent below the overhang, And the terminal cover are discharged to the outside. Therefore, since it is not necessary to use packing, it is not necessary to consider the deterioration of the plastic material, and the waterproof performance of the housing that is made low in cost and improved in design by using the plastic material can be improved.

  Further, even if the terminal block and the internal component cover are separated, the same operation and effect can be obtained.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  First, an outline of the watt-hour meter according to the first embodiment will be described. FIG. 1 is an exploded perspective view showing a schematic configuration of a watt-hour meter according to Embodiment 1 of the present invention. This watt-hour meter includes a case 1, a terminal cover 2, a terminal block 3, an internal component cover 4 and an internal component 5.

  Case 1 is made of a plastic material and forms the upper half of the external appearance of the watt hour meter. The case 1 accommodates the internal component 5 accommodated in the internal component cover 4. The case 1 is provided with a window 11 so that a display (not shown) which is one of internal components can be seen. Further, fastening portions 12a and 12b are formed on the front surface of the case 1. The fastening portions 12a and 12b are provided with verification sealing screws 6a for sealing the internal component 5 accommodated in the internal component cover 4. And 6b are provided with screw holes 13a and 13b.

  The verification seal is performed at the Japan Electric Meters Certification Authority, and in order to ensure that the accuracy of each watt-hour meter is the same so that there is no difference in the amount of power measured by each consumer, The internal measurement circuit of the meter is adjusted, and thereafter, it is performed so as not to be tampered with from the outside.

  The terminal cover 2 is made of a plastic material and forms the lower half of the watt hour meter. The terminal cover 2 is fitted to the case 1 and covers the terminal block 3. This fitting is performed such that the end 21 of the terminal cover 2 enters the inside of the end 14 of the case 1. Further, fastening portions 22a and 22b are formed on the front surface of the terminal cover 2, and power sealing screws 7a and 7b for sealing the power of the watt-hour meter are inserted into the fastening portions 22a and 22b. Screw holes 23a and 23b are provided.

  In addition, the power seal is performed when the watt hour meter is attached to the customer and the wiring is completed. After the proof meter is installed, the wiring of the power line is changed. This is done to prevent unauthorized weighing.

  The terminal block 3 is configured by providing a terminal 31 for fixing a power line connected to a power source and a load on a block made of a plastic material. The terminal block 3 relays a power line from the power supply side to the load side and supplies power to the internal component 5. On the side surface of the terminal block 3, screw holes 32a and 32b into which the power sealing screws 7a and 7b are screwed are provided.

  The internal component cover 4 is made of a plastic material and accommodates the internal component 5. And it is attached (connected) to the terminal block 3 in the state which accommodated the internal component 5. FIG. The inner part cover 4 is provided with bottomed screw holes 41a and 41b into which the test seal screws 6a and 6b are screwed. In addition, in FIG. 1, the shape of the internal component cover 4 is simplified and drawn (details will be described later).

  The internal component 5 is composed of an electronic component that constitutes an electronic circuit for measuring the amount of electric power and a substrate on which the above-described display and the like are mounted. The internal component 5 is accommodated in the internal component cover 4 as described above.

  Next, the detail of the principal part of the watt-hour meter which concerns on Example 1 is demonstrated. FIG. 2A is a front view showing a detailed configuration when the watt hour meter according to the first embodiment is assembled, and FIG. 2B is a side sectional view. FIG. 3 is an enlarged view showing a portion surrounded by a circle in FIG. 2B in an enlarged manner.

  The end portion 21 of the terminal cover 2 can easily enter the inside of the end portion 14 of the case 1 when the terminal cover 2 is fitted to the case 1 as shown in an enlarged view in FIG. Further, it is formed so as to be inclined inward.

  In addition, the inner part cover 4 projects below the bottomed screw holes 41a and 41b into which the test sealing screws 6a and 6b are screwed, and protrudes from the side surface to the outside (case 1 side), and the distal end portion 43 is bent downward. A protruding portion 42 is formed.

  The case 1 and the terminal cover 2 are fitted as follows. That is, the end portion 21 of the terminal cover 2 enters the inside of the end portion 14 of the case 1, and the tip end portion 43 bent below the overhang portion 42 provided in the internal component cover 4 is the end portion of the case 1. 14 and the end portion 21 of the terminal cover 2 are sandwiched and fitted.

  In the watt hour meter according to the first embodiment of the present invention configured as described above, as shown by an arrow in FIG. 3, from above the portion where the case 1 and the terminal cover 2 are fitted by rain or water discharge. Even if there is flowing water, it will not enter the electricity meter.

  Further, as shown by arrows in FIG. 4, there is water from below the portion where the case 1 and the terminal cover 2 are fitted due to wind and rain, water discharge, etc., and a part is from the joint portion of the case 1 and the terminal cover 2 Even if it enters the inside, the tip portion 43 of the overhanging portion 42 is prevented from entering and does not enter the watt hour meter.

  Further, as shown by arrows in FIG. 5, when water enters between the test seal screws 6 a and 6 b and the bottomed screw holes 41 a and 41 b of the fastening portion 12 a or 12 b due to wind or rain or water discharge, the case 1 Since it is discharged to the outside through the space between the tip part 43 bent from the upper outer surface of the overhanging part 42 to the lower part of the overhanging part 42 and the case 1 from between the inner part cover 4 and the inside of the watt hour meter Never get in.

  As described above, according to the watt-hour meter according to the first embodiment of the present invention, the terminal cover 2 is fitted with the case 1 with its end 21 entering the inside of the end 14 of the case 1, In addition, since the distal end portion 43 bent downward from the overhang portion 42 provided in the internal component cover 4 is sandwiched between the end portion 14 of the case 1 and the end portion 21 of the terminal cover 2, Even if water enters, it will not enter the electricity meter. Therefore, since it is not necessary to use packing, it is not necessary to consider the deterioration of the plastic material, and the waterproof performance of the housing that is made low in cost and improved in design by using the plastic material can be improved.

  In addition, although the watt hour meter which concerns on Example 1 mentioned above comprised the terminal block 3 and the internal component cover 4 separately in order to make easy the shaping | molding of the overhang | projection part 42 of the internal component cover 4, FIG. As shown in FIG. 6, the terminal block 3 and the internal component cover 4 can be integrally formed. According to this structure, the process of assembling the watt hour meter can be reduced.

It is a perspective view which decomposes | disassembles and shows the structure of the outline of the watt-hour meter which concerns on Example 1 of this invention. It is the front view and side sectional view which show the detailed structure of the watt-hour meter which concerns on Example 1 of this invention. It is an enlarged view which expands and shows the part of the round mark shown in the side sectional view of FIG.2 (b). It is a figure for demonstrating prevention of invasion of the water from the downward direction in the watt-hour meter which concerns on Example 1 of this invention. It is a figure for demonstrating prevention of the penetration | invasion of the water from a fastening part in the watt-hour meter which concerns on Example 1 of this invention. It is a figure which shows the other structural example of the watt-hour meter which concerns on Example 1 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 2 Terminal cover 3 Terminal block 4 Internal component cover 5 Internal component 6a, 6b Test seal screw 7a, 7b Electric power seal screw 11 Window 12a, 12b, 22a, 22b Fastening part 13a, 13b, 23a, 23b, 32a, 32b Screw Hole 14 Case end 21 Terminal cover end 31 Terminals 41a and 41b Bottomed screw hole 42 Overhang portion 43 End portion of overhang portion

Claims (3)

Internal components including electronic circuits and indicators;
An internal component cover that accommodates the internal component, and is formed integrally with an internal component cover that is provided with a protruding portion that protrudes outward from a side surface and is bent downward, and is connected to a power source and a load. A terminal block with terminals;
A case for accommodating the inner part cover;
A terminal cover that is fitted to the case and covers the terminal block;
The terminal cover has an end portion of the terminal cover that enters the inside of the end portion of the case and is fitted with the case, and a portion that is bent below a protruding portion provided on the internal component cover. A watt-hour meter sandwiched between an end of the case and an end of the terminal cover. Internal components including electronic circuits and indicators;
An internal component cover for accommodating the internal component, the internal component cover provided with an overhanging portion that protrudes outward from the side surface and the tip portion is bent downward;
A terminal block with terminals for connection to a power source and a load;
A case for accommodating the inner part cover;
A terminal cover that is fitted to the case and covers the terminal block;
The terminal cover has an end portion of the terminal cover that enters the inside of the end portion of the case and is fitted with the case, and a portion that is bent below a protruding portion provided on the internal component cover. A watt-hour meter sandwiched between an end of the case and an end of the terminal cover. A fastening part for fastening the internal part cover to the case by screwing above the projecting part and sealing the internal part;
When water enters from the screw of the fastening portion, the water is removed from the upper outer surface of the overhanging portion provided on the internal component cover and below the overhanging portion, and the case. The watt-hour meter according to claim 1 or 2, wherein a path leading to the outside through the space is provided.

Images