JP7068920B2 - Electric energy meter - Google Patents

Description

The present invention relates to a watt-hour meter for measuring electric energy, and more particularly to a waterproof structure of the watt-hour meter.

Electric energy meters generally have a waterproof structure because they may be installed in an environment exposed to wind and rain. For example, in Patent Document 1, in order to prevent water that has entered between the case and the terminal cover from entering the inside of the watt-hour meter, the end of the internal component cover is the end of the case and the terminal cover. A structure has been proposed in which the structure is sandwiched and fitted with the end portion.

Japanese Unexamined Patent Publication No. 2009-36662

However, the technique described in Patent Document 1 has a structure in which water infiltrated from between the case and the terminal cover stays in the region between the case and the terminal cover, and therefore, in an environment exposed to a large amount of water. There is a risk of flooding inside the electricity meter.

The present invention has been made in view of the above, and an object of the present invention is to obtain a watt-hour meter capable of improving waterproof performance.

In order to solve the above-mentioned problems and achieve the object, the watt-hour meter of the present invention has an internal space for accommodating electric parts for measuring the amount of electric power supplied from a power source to a load via wiring. It has a measuring unit, and the back side is provided with a main body that can be attached to the wall surface. The measuring unit includes a box-shaped base having an open upper part and a main body cover that forms an internal space together with the base by covering the outside of the base from above. In the area where the base and the main body cover overlap, water extending from the front side of the measuring part to the back side of the measuring part along the entire circumference along the horizontal direction and infiltrating from the outside into the area where the base and the main body cover overlap. A drainage channel for discharging from the back side of the measuring unit is formed.

According to the present invention, there is an effect that the waterproof performance can be improved.

External perspective view of the watt-hour meter according to the first embodiment of the present invention. A side view showing a state in which the watt-hour meter according to the first embodiment is attached to the wall surface. External perspective view of the main body of the watt-hour meter according to the first embodiment An exploded perspective view of the measuring unit of the watt-hour meter according to the first embodiment. External perspective view of the base of the watt-hour meter according to the first embodiment A vertical sectional view showing a state in which the base and the main body cover according to the first embodiment are fitted to each other. Enlarged view of area A shown in FIG. The figure which shows the discharge path of the water which invaded into the fitting area of the base and the main body cover which concerns on Embodiment 1. External perspective view of the base of the watt-hour meter according to the second embodiment of the present invention.

Hereinafter, the watt-hour meter according to the embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.

Embodiment 1.
FIG. 1 is an external perspective view of the watt-hour meter according to the first embodiment of the present invention, and FIG. 2 is a side view showing a state in which the watt-hour meter according to the first embodiment is attached to a wall surface. Further, FIG. 3 is an external perspective view of the main body of the watt-hour meter according to the first embodiment, and FIG. 4 is an exploded perspective view of the measuring portion of the watt-hour meter according to the first embodiment.

As shown in FIG. 1, the watt-hour meter 1 according to the first embodiment includes a main body portion 2 and a terminal cover 3. As shown in FIG. 2, the watt-hour meter 1 is attached to a wall surface 8 on which the back surface 2a side of the main body 2 is vertical. The watt-hour meter 1 is, for example, an electronic watt-hour meter, but may be a watt-hour meter other than the electronic watt-hour meter.

The power meter 1 is attached to the wall surface 8 on the back surface 2a side of the main body 2 so that the vertical direction in FIGS. 1 and 2 is the vertical direction and the horizontal direction and the front-back direction in FIGS. 1 and 2 are horizontal. .. In FIGS. 1 and 2, for the sake of clarity, the vertical direction of the power meter 1 is the Z-axis direction, the left-right direction of the power meter 1 is the X-axis direction, and the front-back direction of the power meter 1 is shown. A three-dimensional Cartesian coordinate system in the Y-axis direction is shown. Such a Cartesian coordinate system is similarly shown in the other drawings used in the following description.

As shown in FIG. 3, the main body 2 is located below the measuring unit 4 for measuring the amount of electric power supplied from the power supply (not shown) to the load (not shown) via the wiring 7 shown in FIG. It is provided with a terminal block 5 to be located. The measuring unit 4 includes a box-shaped base 10 having an open upper portion, a main body cover 20 that forms an internal space 40 together with the base 10 by covering the outside of the base 10 from above, and a sealing cap 30.

The terminal block 5 has a wiring work surface on the front side in which a plurality of terminals 6 for electrically connecting the measuring unit 4 and the wiring 7 are arranged. The terminal cover 3 is configured to be detachably attached to the main body 2 in the vertical direction, and when the terminal cover 3 is attached to the main body 2, the front surface side of the terminal block 5 is covered by the terminal cover 3 shown in FIG. ..

As shown in FIG. 4, the internal space 40 formed by the base 10 and the main body cover 20 accommodates an electric circuit (not shown) that measures, stores, and displays the amount of electric power. Such an electric circuit is composed of a plurality of electronic components, a substrate, and a plurality of electrical components such as electric wires.

When the back surface 2a side of the main body 2 of the watt-hour meter 1 is attached to the outdoor wall surface 8, the watt-hour meter 1 is exposed to wind and rain, and the outer surface of the watt-hour meter 1 is directly exposed to water. As described above, the above-mentioned plurality of electric parts are housed in the internal space 40 formed by the base 10 and the main body cover 20, and the inundation of the internal space 40 causes a failure of the watt-hour meter 1 or the like. Leads to.

Therefore, the watt-hour meter 1 has a waterproof structure in the region 80 where the base 10 and the main body cover 20 shown in FIG. 3 overlap. Specifically, in the region 80 where the base 10 and the main body cover 20 overlap, water formed along the horizontal direction toward the back surface 4a side of the measuring unit 4 and entering the region 80 from the outside is discharged to the back surface 4a of the measuring unit 4. A drainage channel that drains from the side is formed. This prevents water that has entered the region 80 where the base 10 and the main body cover 20 overlap from between the main body cover 20 and the terminal cover 3 from entering the internal space 40. Further, the water that has entered the region 80 where the base 10 and the main body cover 20 overlap from between the main body cover 20 and the terminal cover 3 can be discharged from the back surface 4a side of the measuring unit 4. The region 80 can also be referred to as a fitting region.

Hereinafter, the waterproof structure of the watt-hour meter 1 will be specifically described with reference to FIGS. 4 to 7. FIG. 5 is an external perspective view of the base of the watt-hour meter according to the first embodiment, and FIG. 6 is a vertical sectional view showing a state in which the base and the main body cover according to the first embodiment are fitted. Yes, FIG. 7 is an enlarged view of the A region shown in FIG.

As shown in FIG. 4, the base 10 includes a box-shaped base main body 11 having an open upper portion and a fitting portion 12 formed so as to project outward from the upper outer periphery of the base main body 11. Further, the main body cover 20 includes a box-shaped cover main body 21 having an opening at the bottom, a fitting portion 22 protruding downward from the lower end of the cover main body 21, and a mounting portion 23 attached to the wall surface 8 shown in FIG. To prepare for. The base body 11 and the body cover 20 form a part of the internal space 40. The above-mentioned region 80 is formed by the fitting portion 12 and the fitting portion 22.

As shown in FIGS. 4 to 7, the fitting portion 12 of the base 10 includes convex portions 51, 53, 54 and an extension portion 52. The ridge portion 51 projects outward from the front surface 111, the right side surface 112, the left side surface 113, and the back surface 114 of the base body 11, and is formed in an annular shape in a plan view. The extended portion 52 extends downward from the lower tip of the convex portion 51 and faces the front surface 111, the right side surface 112, the left side surface 113, and the back surface 114 of the base body 11. The ridges 53 and 54 project outward from the outer circumference of the stretched portion 52, respectively. The ridge portion 53 is an example of the first ridge portion, the ridge portion 54 is an example of the second ridge portion, and the ridge portion 51 is an example of the third ridge portion.

As shown in FIGS. 4 and 5, the stretched portion 52 has a concave engagement with a convex locked portion (not shown) that protrudes inward from the inner circumference of the fitting portion 22 of the main body cover 20. A stop portion 56 and a screw hole 57 into which a sealing screw (not shown) is inserted are formed. The locking portion 56 is formed on the right wall portion 522 and the left wall portion 523 of the extending portion 52, respectively, but in FIGS. 4 and 5, the locking portion 56 formed on the right wall portion 522 is hidden. Not shown because it is in position.

The main body cover 20 is locked to the base 10 by locking the locked portion (not shown) formed in the fitting portion 22 to the locking portion 56. As a result, the engaging force between the base 10 and the main body cover 20 can be increased. Therefore, even if the base 10 to which the electric circuit and the metal member are attached is heavy, the base 10 and the main body cover 20 are fitted when the main body cover 20 is gripped and the watt-hour meter 1 is lifted. Can be prevented from being released.

Further, as shown in FIG. 4, a screw hole 63 into which a sealing screw (not shown) is inserted is formed in the fitting portion 22. A sealing screw (not shown) is inserted into the fitting portion 22 of the main body cover 20 through the screw hole 63 of the fitting portion 22 and the screw hole 57 of the fitting portion 12, and the fitting portion 22 is screwed to the fitting portion 12 of the base 10. Will be done. Then, as shown in FIG. 3, a sealing cap 30 that covers the sealing screw is attached to the main body cover 20.

As described above, the watt-hour meter 1 has a structure in which it is difficult to remove the main body cover 20 from the base 10 unless the sealing cap 30 is broken and the sealing screw is removed. It is possible to prevent unauthorized modification of the wear or software. The watt-hour meter 1 also has a configuration for detecting that the terminal cover 3 has been removed.

The ridge 51 extends the outer circumference of the cover main body 21 along the horizontal direction, and the ridges 53 and 54 extend the outer circumference of the stretched portion 52 along the horizontal direction. The ridges 51, 53, 54 are arranged so as to be spaced apart from each other in the vertical direction. The ridge portion 54 is arranged above the ridge portion 53, and the ridge portion 51 is arranged above the ridge portion 54.

The ridges 51 project from the front surface 111 and the back surface 114 of the base body 11 and extend in the left-right direction, respectively, and the ridges 51 project from the right side surface 112 and the left side surface 113 of the base body 11 and extend in the front-rear direction. It has ridges 512 and 513. The ridges 511 are continuous with the front ends of the ridges 512 and 513, and the ridges 514 are continuous with the rear ends of the ridges 512 and 513. In this way, the ridge portion 51 is formed in an annular shape over the entire outer circumference of the base body 11.

The ridge portion 53 has a ridge portion 531 that protrudes forward from the front wall portion 521 of the stretch portion 52 and extends in the left-right direction, and a ridge portion that protrudes to the right from the right wall portion 522 of the stretch portion 52 and extends in the front-rear direction. It has a 532, a ridge portion 533 that protrudes to the left from the left wall portion 523 of the stretched portion 52 and extends in the front-rear direction, and a ridge portion 534, 535 that protrudes rearward from the rear wall portion 524 of the stretched portion 52. The ridge portion 532 and the ridge portion 533 are partially discontinuous due to the left and right locking portions 56. Further, as shown in FIG. 5, the ridge portion 534 and the ridge portion 535 are arranged at intervals from each other.

Similarly, the ridge portion 54 protrudes forward from the front wall portion 521 of the stretched portion 52 and extends in the left-right direction, and the ridge portion 54 protrudes to the right from the right wall portion 522 of the stretched portion 52 and extends in the front-rear direction. The ridges 542, the ridges 543 protruding to the left from the left wall 523 of the stretched portion 52 and extending in the front-rear direction, and the ridges 544 and 545 protruding rearward from the rear wall 524 of the stretched portion 52. Has. Further, as shown in FIG. 4, the ridge portion 543 is partially discontinuous depending on the region where the screw hole 57 is formed. Further, as shown in FIG. 5, the ridge portion 544 and the ridge portion 545 are arranged at intervals from each other.

As shown in FIG. 4, a mounting portion 23 is mounted on the rear portion of the cover main body 21. The mounting portion 23 includes a plate-shaped portion 231 having a mounting surface that abuts on the wall surface 8 shown in FIG. 2, and a support portion 232 that is formed between the plate-shaped portion 231 and the cover main body 21 and supports the plate-shaped portion 231. To prepare for. A mounting hole 231a into which a screw or bolt (not shown) is inserted is formed in the plate-shaped portion 231, and the mounting portion 23 is fixed to the wall surface 8 by the screw or bolt. As a result, the back surface 4a side of the measuring unit 4 is attached to the wall surface 8.

As shown in FIG. 6, the fitting portion 22 has an upper end continuous with the lower end of the cover main body 21, and is continuous with a bent portion 61 that extends outward and then bends downward, and a bent portion 61 that is continuous with the lower end of the bent portion 61. A stretching portion 62 extending downward is provided. The stretched portion 62 is stretched outward as it goes downward.

As shown in FIG. 7, in a state where the fitting portion 12 of the base 10 and the fitting portion 22 of the main body cover 20 are fitted, the convex portions 51, 53, are formed on the inner surface 22a of the fitting portion 22. 54 is in contact.

The ridges 511, 512, 513, 514 of the ridges 51 abut on the inner surface of the bent portion 61 of the inner surfaces 22a of the fitting 22. Specifically, the ridges 511, 512, 513, 514 of the ridges 51 abut on the inner surface of the bent portion 61 so as to be in contact with a region facing each other in the horizontal direction and a region facing each other in the vertical direction.

The ridges 531, 532, 533, 534, 535 of the ridges 53 face each other in the horizontal direction and abut on the inner surface of the stretched portion 62 of the inner surfaces 22a of the fitting portion 22. Similarly, the ridges 541, 542, 543, 544, 545 of the ridges 54 abut on the inner surface of the stretched portion 62 of the inner surface 22a of the fitting portion 22 so as to face each other in the horizontal direction.

A drainage channel 70 is formed between the inner surface 22a of the fitting portion 22 and the outer surface 52a of the extending portion 52, which is partitioned by the ridges 53 and the ridges 54 and extends along the horizontal direction. Further, between the inner surface 22a of the fitting portion 22 and the outer surface 52a of the extending portion 52, a drainage channel 71 which is partitioned by the ridge portion 51 and the ridge portion 54 and extends along the horizontal direction is formed. ..

As shown in FIG. 6, a discharge space 90 partitioned by the ridges 514 and the ridges 55 is formed between the back surface 114 of the base body 11 and the inner surface 22a of the fitting portion 22, and the drainage channel described above is formed. The ends of 70, 71 are connected to the discharge space 90.

When the watt-hour meter 1 is exposed to rain and wind, the water that hits the outer surface of the measuring unit 4 flows downward along the outer surface of the measuring unit 4. However, when the watt-hour meter 1 is exposed to a large amount of water, a part of water may infiltrate from between the main body cover 20 and the terminal cover 3 into the region 80 where the base 10 and the main body cover 20 overlap due to the capillary phenomenon. be. The region 80 is formed by the fitting portion 12 and the fitting portion 22 as shown in FIGS. 6 and 7.

FIG. 8 is a diagram showing a discharge path of water that has entered the fitting region between the base and the main body cover according to the first embodiment. As shown in FIG. 8, the convex portion 53 is partially discontinuous due to the locking portion 56. Therefore, water may infiltrate from the region of the convex portion 53 that is discontinuous due to the locking portion 56 to the region 80 where the base 10 and the main body cover 20 overlap. As shown in FIG. 8, the water that has entered the region 80 is discharged to the wall surface 8 from the discharge ports 73 and 74 formed on the back surface 4a side of the measuring unit 4 through the drainage channel 70 and the discharge space 90.

Further, as described above, the drainage channel 71 is formed above the drainage channel 70. Therefore, even when the drainage channel 70 is filled with the water that has entered from the locking portion 56, the drainage channel 71 blocks the water that has entered from the locking portion 56 from creeping into the internal space 40 due to the capillary phenomenon. can do. As shown in FIG. 8, the water that has entered the drainage channel 71 due to the capillary phenomenon is discharged to the wall surface 8 from the discharge ports 73 and 74 formed on the back surface 4a side of the measuring unit 4 through the drainage channel 71 and the discharge space 90. Will be done.

Further, a drainage channel 71 is interposed between the screw hole 63 of the main body cover 20 and the convex portion 51. Therefore, even when water infiltrates into the region 80 where the base 10 and the main body cover 20 overlap from the screw hole 63 of the main body cover 20 due to the capillary phenomenon, the water infiltrated into the region 80 still enters the drainage channel 71 and the discharge space 90. From the discharge ports 73 and 74 formed on the back surface 4a side of the measuring unit 4, the water is discharged to the wall surface 8.

In the above-mentioned example, the ridge portion 53 has a discontinuous region due to the locking portion 56, but the ridge portion 53 is not provided with the discontinuous region without providing the locking portion 56 at the above-mentioned position. It may be configured. Even in this case, the water that has entered the drainage channel 71 due to the capillary phenomenon from between the convex portion 53 and the inner surface 22a of the fitting portion 22 travels through the drainage channel 71 and the discharge space 90 to the back surface of the measuring unit 4. It is discharged to the wall surface 8 from the discharge ports 73 and 74 formed on the 4a side.

Further, the position of the screw hole 63 is determined by the position and shape of the sealing cap 30, but the position and shape of the sealing cap 30 is not limited to the above-mentioned example. For example, the screw hole 63 may be formed between the ridge portion 53 and the ridge portion 54, or may be formed below the ridge portion 53. Even in this case, water that has entered the region 80 where the base 10 and the main body cover 20 overlap from the screw hole 63 due to the capillary phenomenon is discharged from the discharge ports 73 and 74 formed on the back surface 4a side of the measuring unit 4 to the wall surface 8. Can be discharged.

Further, as described above, the convex portion 51 is in contact with the inner surface 22a of the fitting portion 22. The ridge portion 51 is formed over the entire circumference of the outer surface of the base body 11 in the horizontal direction. Therefore, the ridge portion 51 is in contact with the inner surface 22a of the fitting portion 22 over the entire circumference in the horizontal direction. As a result, in addition to the waterproof function of preventing water from entering the internal space 40, the dustproof function of preventing dust from entering is ensured.

As shown in FIG. 5, a ridge portion 55 extending in the horizontal direction is formed on the back surface 114 side of the base main body 11, and the ridge portion 55 hits the inner surface 22a of the fitting portion 22. Be touched. The above-mentioned discharge ports 73 and 74 are formed in the ridge portion 55. Therefore, foreign matter such as dust, dust, and insects may enter from the discharge ports 73 and 74, but as described above, the ridge portion 51 covers the entire circumference of the inner surface 22a of the fitting portion 22 in the horizontal direction. Since they are in contact with each other, it is possible to prevent foreign matter from entering the internal space 40.

Since the fitting portion 22 is inclined in a direction away from the outer surface 52a of the stretched portion 52 toward the lower side, the distance between the inner surface 22a of the fitting portion 22 and the outer surface 52a of the stretched portion 52 becomes larger toward the lower side. Become. Therefore, the volume of the space of the drainage channel 70 can be increased as compared with the case where the outer surface 52a of the stretched portion 52 is not inclined in the direction away from the inner surface 22a of the fitting portion 22, and the base 10 and the main body cover 20 are connected. It is possible to improve the function of discharging the water that has entered the overlapping region 80 from the back surface 4a side of the measuring unit 4.

Further, in the above-mentioned example, the ridge portion 51, the ridge portion 53, and the ridge portion 54 are formed in the fitting portion 12, but the ridge portion 51, the ridge portion 53, and the ridge portion 54 are formed. One or more may be configured to protrude from the inner surface 22a of the fitting portion 22. In this case, an abutting surface that comes into contact with one or more of the ridges 51, the ridges 53, and the ridges 54 is formed on the outer surface of the fitting portion 12.

Further, in the above-mentioned example, two drainage channels 70 and 71 are formed in the region 80, but the number of drainage channels formed in the region 80 may be three or more. In this case, the number of ridges extending along the front-rear direction and the left-right direction is four or more.

As described above, the watt-hour meter 1 according to the first embodiment is a measuring unit having an internal space 40 for accommodating electric parts for measuring the amount of electric power supplied from the power source to the load via the wiring 7. 4 is provided, and the back surface 2a side is provided with a main body portion 2 attached to the wall surface 8. The measuring unit 4 includes a box-shaped base 10 having an open upper portion, and a main body cover 20 that forms an internal space 40 together with the base 10 by covering the outside of the base 10 from above. In the region 80 where the base 10 and the main body cover 20 overlap, the water is stretched in the horizontal direction toward the back surface 4a side of the measuring unit 4 and the water that has entered the region 80 from the outside is discharged from the back surface 4a side of the measuring unit 4. Drainage channels 70 and 71 are formed. As a result, the water that has entered the region 80 where the base 10 and the main body cover 20 overlap can be discharged from the back surface 4a side of the measuring unit 4, and the waterproof performance can be improved. Further, since the waterproof performance can be improved without using packing, the cost can be reduced.

Further, in the region 80 where the base 10 and the main body cover 20 overlap, a plurality of drainage channels 70 and 71 are formed adjacent to each other in the vertical direction. As a result, even when water collects in the drainage channel 70, the drainage channel 71 can prevent the water from entering the internal space 40, and the waterproof performance can be further improved.

Further, the base 10 extends in the horizontal direction toward the back surface 4a side of the measuring unit 4, and covers the ridge portion 54 and the ridge portion 53 that abut on the inner surface 22a of the fitting portion 22 of the main body cover 20. Has in 80. The ridge portion 54 and the ridge portion 53 are arranged so as to be spaced apart from each other in the vertical direction. In the region 80, a drainage channel 70 is formed by a space partitioned by the ridge portion 54 and the ridge portion 53. Thereby, the drainage channel 70 can be easily formed.

Further, the base 10 has a ridge portion 51 extending in the horizontal direction toward the back surface 4a side of the measuring portion 4 and abutting on the inner surface 22a of the fitting portion 22 of the main body cover 20 in the region 80. The ridges 51 are arranged at intervals in the vertical direction from the ridges 54. The region 80 is a drainage channel different from the drainage channel 70 depending on the space partitioned by the convex section 54 and the convex section 51, and drains water that has entered from the outside from the back surface 4a side of the measuring unit 4. 71 is formed. Thereby, the drainage channel 71 can be easily formed.

Embodiment 2.
The watt-hour meter according to the second embodiment is different from the watt-hour meter 1 according to the first embodiment in that the convex portion 54 of the watt-hour meter 1 according to the first embodiment is not provided. In the following, the components having the same functions as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted, and the differences from the electric energy meter 1 of the first embodiment will be mainly described.

FIG. 9 is an external perspective view of the base of the watt-hour meter according to the second embodiment of the present invention. The base 10A shown in FIG. 9 includes a base main body 11 and a fitting portion 12A. The fitting portion 12A is different from the fitting portion 12 in that the convex portion 54 shown in FIG. 4 is not provided.

Therefore, between the inner surface 22a of the fitting portion 22 (not shown) and the outer surface 52a of the extending portion 52, a drainage channel 72 which is partitioned by the ridge portion 53 and the ridge portion 51 and extends along the horizontal direction is provided. It is formed. Thereby, for example, the fitting portion 12A of the base 10A and the fitting portion 22 of the main body cover 20 are formed from a region discontinuous by the locking portion 56 or a screw hole 63 of the main body cover 20 (not shown). Even when water enters the region 80A, it is discharged to the wall surface 8 through the drainage channel 72. Further, the convex portion 51 secures a dustproof function for preventing the intrusion of dust in addition to the waterproof function for preventing the intrusion of water into the internal space 40. The ridge portion 53 is an example of the first ridge portion, and the ridge portion 51 is an example of the second ridge portion.

As described above, the base 10A of the second embodiment is formed along the horizontal direction toward the back surface 4a side of the measuring unit 4, and the convex portion 51, which abuts on the inner surface 22a of the fitting portion 22 of the main body cover 20. 53 is formed. The ridge portion 51 and the ridge portion 53 are formed so as to be spaced apart from each other in the vertical direction. The drainage channel 72 is formed by the space partitioned by the ridge portion 51 and the ridge portion 53. Thereby, the drainage channel 72 can be easily constructed.

The configuration shown in the above embodiments shows an example of the contents of the present invention, can be combined with another known technique, and is one of the configurations as long as it does not deviate from the gist of the present invention. It is also possible to omit or change the part.

1 watt-hour meter, 2 main body, 2a, 4a, 114 back, 3 terminal cover, 4 measuring part, 5 terminal block, 6 terminals, 7 wiring, 8 wall surface, 10,10A base, 11 base main body, 12,12A, 22 Fitting part, 20 body cover, 21 cover body, 22a inner surface, 23 mounting part, 30 sealing cap, 40 internal space, 51,53,54,55,511,512,513,514,531,532,533 534,535,541,542,543,544,545 Convex part, 52,62 Extension part, 52a outer surface, 56 locking part, 57,63 screw hole, 61 bending part, 70,71,72 drainage channel, 73 , 74 Outlet, 80 area, 90 exhaust space, 111 front, 112 right side, 113 left side, 231 plate-shaped part, 231a mounting hole, 232 support part, 521 front wall part, 522 right wall part, 523 left wall part 524 Rear wall part.

Claims (4)

It has a measuring unit with an internal space for accommodating electrical components for measuring the amount of electric power supplied from the power supply to the load via wiring, and has a main body unit whose back side is mounted on the wall surface.
The measuring unit is
A box-shaped base with an open top and
A main body cover that forms the internal space together with the base by covering the outside of the base from above is provided.
In the region where the base and the main body cover overlap, the water that extends from the front side of the measuring portion to the back side of the measuring portion along the entire circumference along the horizontal direction and has entered the region from the outside is weighed. A watt-hour meter characterized by the formation of a drainage channel that discharges from the back side of the unit. In the area
The electric energy meter according to claim 1, wherein a plurality of the drainage channels are formed adjacent to each other in the vertical direction. The base is
The region has a first ridge portion and a second ridge portion that extend horizontally toward the back surface side of the measuring portion and abut on the inner surface of the main body cover.
The first ridge portion and the second ridge portion are arranged at intervals in the vertical direction from each other.
In the area
The watt hour meter according to claim 1, wherein the drainage channel is formed by a space partitioned by the first ridge portion and the second ridge portion. The base
The region has a third ridge portion that extends along the horizontal direction toward the back surface side of the measuring portion and abuts on the inner surface of the main body cover.
The third ridge portion is arranged at a vertical interval from the second ridge portion.
In the area
A drainage channel different from the drainage channel is formed by the space partitioned by the second ridge portion and the third ridge portion, and a drainage channel that discharges water that has entered from the outside from the back surface side of the measuring portion is formed. The watt-hour meter according to claim 3, wherein the watt-hour meter is made.

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