JP2021148588A - Housing structure of electricity meter - Google Patents

Abstract

To increase the work efficiency when assembling an electricity meter.SOLUTION: In a housing structure of an electricity meter (1) including: a housing base (2) for storing a measurement circuit for measuring an electricity; and an upper cover (3) attached to the housing base by being slid, the upper cover is provided with a sealing screw (71) to fasten the upper cover to the housing base, the housing base is provided with a pedestal part (6) to which the sealing screw is fastened, and a guidance unit (5) for guiding the sealing screw to the pedestal part is provided.SELECTED DRAWING: Figure 1

Description

The present invention relates to a housing structure of an electric energy meter.

Conventionally, there is known a watt-hour meter having a housing base and a cover member covering the housing base, and having a sealing structure that leaves a trace of opening when the cover member is opened. For example, in Patent Document 1, after sliding and fitting from the upper side of the housing base, a sealing screw is attached to the housing base, and a sealing cap is attached on the sealing screw to slide the cover member. Electric energy meters with a sealed structure that restricts movement have been proposed.

Japanese Unexamined Patent Publication No. 2013-217828

By the way, watt-hour meters applied to general residences and the like are often installed outdoors. Therefore, it is required to adopt a waterproof structure that prevents rainwater or the like from entering the measurement circuit housed inside. In such a waterproof structure, it is preferable to eliminate as much as possible a place where rainwater or the like can enter the inside of the watt hour meter. In the conventional watt hour meter described above, a situation may occur in which rainwater infiltrates through a notch for attaching a sealing screw formed on the cover member.

From the viewpoint of preventing rainwater or the like from entering the inside of the watt hour meter, it is preferable to attach a sealing screw to the cover member, cover the housing base with the cover member, and then fix the sealing screw to the housing base. .. However, when the sealing screw is attached to the cover member, the sealing screw may interfere with a part of the housing base, which may cause a decrease in work efficiency of the assembly work.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a housing structure of an electric energy meter capable of improving work efficiency at the time of assembling the electric energy meter.

The housing structure of the watt-hour meter according to the present invention is a housing of a watt-hour meter including a housing base for accommodating a measurement circuit for measuring electric power and a cover member attached to the housing base by sliding the movement. In the body structure, the cover member is provided with a fastening member for fastening the cover member to the housing base, and the housing base is provided with a pedestal portion to which the fastening member is fastened. The pedestal portion is provided with a guide portion for guiding the fastening member.

According to the present invention, it is possible to improve the work efficiency at the time of assembling the watt hour meter.

It is a perspective view which shows the electric energy meter which concerns on this embodiment from the front side. It is a front view of the electric energy meter which concerns on this embodiment. It is a perspective view which shows the electric energy meter which concerns on this embodiment from the back side. It is a perspective view which shows the electric energy meter which concerns on this embodiment from the front side. It is an enlarged view of the periphery of the slope-shaped portion and the pedestal portion of the watt-hour meter according to the present embodiment. It is a front view of the state in the process of assembling the watt hour meter which concerns on this embodiment. FIG. 6 is a cross-sectional view taken along the line AA shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The housing structure of the watt-hour meter according to the present invention can be applied to any watt-hour meter. In the following, a watt-hour meter in which the power measurement unit and the terminal unit are integrated will be described, but the present invention is not limited to this, and the watt-hour meter in which the power measurement unit and the terminal unit are separated is also used. Can be applied.

FIG. 1 is a perspective view showing the watt hour meter 1 according to the present embodiment from the front side. FIG. 2 is a front view of the watt hour meter 1 according to the present embodiment. 1 and 2 show a state in which the upper cover 3 is removed from the housing base 2 for convenience of explanation. Further, in FIG. 1, the lower cover 4 and the sealing cap 72 are omitted for convenience of explanation. In the following, the vertical direction, the horizontal direction, and the front-rear direction shown in FIG. 1 will be described as the vertical direction, the left-right direction, and the front-back direction of the power meter 1.

As shown in FIGS. 1 and 2, the watt hour meter 1 according to the present embodiment includes a housing base 2 and an upper cover 3 and a lower cover 4 that cover the housing base 2. The housing base 2, the upper cover 3 and the lower cover 4 are made of an insulating synthetic resin material such as PBT. The upper cover 3 constitutes an example of a cover member mounted on the housing base 2.

The housing base 2 is configured by integrating a power measurement unit (hereinafter, referred to as “measurement unit”) 21 arranged on the upper side portion and a terminal unit 22 arranged on the lower side portion. The measuring unit 21 is provided with a main body portion 211 in which a measuring circuit for measuring electric power is housed. A display unit 212 for displaying the power measured by the measurement circuit is provided on the front surface of the main body unit 211. A plurality of power supply side and load side terminals (not shown) are arranged in the left-right direction in the terminal unit 22, and a plurality of power supply side conductors and load side conductors are connected to the lower end portions thereof.

A plurality of ribs 213 to 215 are provided on the main body 211 of the measuring unit 21. These ribs 213 to 215 are provided so as to extend outward from the upper surface and the left and right side surfaces of the main body portion 211, respectively. The ribs 213 to 215 are arranged parallel to each other with a predetermined interval in the front-rear direction. The rib 213 is arranged at a position near the rear end portion of the measuring unit 21. The rib 214 is arranged at a position slightly forward of the rib 213. The rib 215 is arranged at a position closer to the front end portion than the center in the front-rear direction of the measuring unit 21 (see FIG. 7).

A guide portion 5 and a pedestal portion 6 are provided on the right front surface of the rib 215. The guide portion 5 constitutes an example of a guide portion that guides the sealing screw 71, which will be described later, to the pedestal portion 6. The pedestal portion 6 is a portion to which the sealing screw 71, which will be described later, is fastened and fixed. The configurations of the guide portion 5 and the pedestal portion 6 will be described later.

An engaging portion 216 is provided in the center of the front surface of the main body portion 211. The engaging portion 216 is arranged on the lower side of the display portion 212. The engaging portion 216 is configured to open to the front side so as to be engaged with the claw portion 344 of the upper cover 3 described later. By engaging the claws 344 of the upper cover 3, the upper cover 3 is prevented from coming off from the housing base 2 upward.

The upper cover 3 opens downward and generally has a box shape. An opening 32 into which acrylic glass or the like is fitted is formed in the front surface portion 31 of the upper cover 3. A flat surface portion 33 is provided on the right side portion of the front surface portion 31. The flat surface portion 33 extends in the vertical direction at a position rearward from the front surface portion 31.

A sealing structure portion 7 is attached in the vicinity of the lower end portion of the flat surface portion 33. The sealing structure portion 7 is composed of a sealing screw 71 attached to the flat surface portion 33 and a sealing cap 72 covering the sealing screw 71. The sealing screw 71 constitutes an example of a fastening member that fastens the upper cover 3 to the housing base 2. The sealing cap 72 covers the sealing screw 71 for fixing the upper cover 3 to the housing base 2.

The sealing screw 71 is provided with a falling-off prevention structure. The fall-off prevention structure is composed of a small-diameter portion and a pair of large-diameter portions arranged in the front-rear direction across the small-diameter portion in the shaft portion of the sealing screw 71 (see FIG. 7). The pair of large diameter portions are configured to have a larger diameter than the through hole 33a (see FIG. 3) formed in the flat surface portion 33. The small diameter portion is configured to have a smaller diameter than the through hole 33a. By deforming a part of the flat surface portion 33 around the through hole 33a and inserting the large diameter portion on the housing base 2 side, the wall surface forming the flat surface portion 33 is arranged in the small diameter portion. As a result, the sealing screw 71 is attached to the flat surface portion 33 and is prevented from falling off from the upper cover 3.

FIG. 3 is a perspective view showing the watt hour meter 1 according to the present embodiment from the back side. FIG. 3A shows a perspective view of the upper cover 3, and FIG. 3B shows a perspective view of the housing base 2. In FIG. 3, for convenience of explanation, the sealing screw 71 attached to the upper cover 3 is omitted.

As shown in FIG. 3B, a rib 217 slightly protruding rearward is provided on the rear surface of the main body 211 of the measuring unit 21. The rib 217 has an upper side portion 217a and a pair of side side portions 217b extending downward from the left and right edge portions of the upper side portion 217a, and generally opens downward. At the center of the upper side portion 217a, a protruding piece 218 protruding upward is provided. The projecting piece 218 has a generally rectangular shape when viewed from the rear, and has a slight thickness in the front-rear direction. An engaging groove 218a is formed on the rear surface of the projecting piece 218. The engagement groove 218a engages with an engagement piece (not shown) provided on the wall surface to which the watt hour meter 1 is fixed.

As shown in FIG. 3A, the rear surface 34 of the upper cover 3 is provided with two wall portions 341 and 342. These wall portions 341 and 342 are arranged in parallel at regular intervals in the front-rear direction. The wall portion 341 has an upper wall portion 341a extending in the left-right direction near the upper end of the upper cover 3 and a pair of side wall portions 341b extending downward from the left and right edges of the upper wall portion 341a, and generally has a lower side. It is open to. Similarly, the wall portion 342 has an upper wall portion 342a extending in the left-right direction near the upper end of the upper cover 3, and a pair of side wall portions 342b extending downward from the left and right edge portions of the upper wall portion 342a. It generally opens downward.

The openings formed in these wall portions 341 and 342 have a shape that matches the shape of the main body portion 211 of the measurement unit 21. That is, when the upper cover 3 is attached to the housing base 2, the end faces of the wall portions 341 and 342 on the opening side are arranged so as to face the outer surface of the main body portion 211. For example, the end surface of the wall portion 341 on the opening side is arranged so as to face the outer surface of the rib 217.

A recess 343 is formed in the center of the upper wall portion 341a of the wall portion 341. The recess 343 has a shape that is slightly recessed forward from the surface (rear surface) of the upper wall portion 341a. The recess 343 is configured to accommodate the projecting piece 218 of the housing base 2 described above.

A claw portion 344 is provided at the center of the lower end side of the inner surface of the front surface portion 31 of the upper cover 3. The claw portion 344 has an inclined surface on the lower side and a horizontal plane on the upper side. When the upper cover 3 is attached to the housing base 2, the claw portion 344 enters the engaging portion 216 and plays a role of preventing the upper cover 3 from falling off from the housing base 2.

The watt hour meter 1 according to the present embodiment is mounted by sliding the upper cover 3 having the above configuration with respect to the housing base 2 from the upper side. When the upper cover 3 is attached to the housing base 2, the ribs 213 and 214 of the housing base 2 are used as guides. More specifically, the upper cover 3 is attached to the housing base 2 by sliding the upper cover 3 while bringing the wall portions 341 and 342 of the upper cover 3 into contact with the rear surfaces of the ribs 213 and 214, respectively. NS.

FIG. 4 is a perspective view showing the watt hour meter 1 according to the present embodiment from the front side. As shown in FIG. 4, when the upper cover 3 is attached to the housing base 2, the upper cover 3 is arranged at a position covering the ribs 213 to 215 provided on the main body 211. In this state, the claw portion 344 provided on the upper cover 3 is in a state of being inserted into the engaging portion 216 of the main body portion 211. Since the upper cover 3 is covered with the housing base 2 from above, it is possible to prevent rainwater or the like from entering the inside of the watt hour meter 1. Even when rainwater or the like enters the upper cover 3 from the periphery of the projecting piece 218, it penetrates into the measurement circuit in the main body 211 by the wall portion 342 of the upper cover 3 and the ribs 214 and 215 of the housing base 2. Is prevented.

Here, the configurations of the guide portion 5 and the pedestal portion 6 provided on the front surface of the rib 215 of the housing base 2 will be described with reference to FIG. FIG. 5 is an enlarged view of the periphery of the guide portion 5 and the pedestal portion 6 included in the watt hour meter 1 according to the present embodiment. 5A, 5B, and 5C show perspective views, front views, and side views of the periphery of the guide portion 5 and the pedestal portion 6 included in the housing base 2 according to the present embodiment, respectively.

As shown in FIG. 5, the guide portion 5 has a pair of plate-shaped portions 51 and 52 extending in parallel in the vertical direction. These plate-shaped portions 51 and 52 are provided so as to project from the front surface of the rib 215. These plate-shaped portions 51 and 52 have a configuration in which the length protruding from the front surface of the rib 215 becomes longer toward the lower side. That is, these plate-shaped portions 51 and 52 have a configuration in which they are inclined so as to protrude toward the front side toward the lower side. In other words, these plate-shaped portions 51 and 52 have a slope shape that protrudes toward the front side toward the downward side.

A groove 53 is provided between the plate-shaped portions 51 and 52. The plate-shaped portions 51 and 52 are arranged so as to face each other with the groove portion 53 interposed therebetween. The groove portion 53 constitutes an example of a guide groove for accommodating the tip end portion of the sealing screw 71 when the upper cover 3 is attached to the housing base 2.

The pedestal portion 6 is arranged on the lower side of the guide portion 5. The pedestal portion 6 generally has a rectangular parallelepiped shape. The pedestal portion 6 is formed with an opening 61 that opens upward and forward. Inside the pedestal portion 6, a space 62 configured to extend in the front-rear direction is formed. The space 62 is continuously provided in the above-mentioned opening 61. That is, the opening 61 and the space 62 communicate with each other.

A pair of protruding walls 63 are provided on the upper side of the pedestal portion 6. These protruding walls 63 extend upward from the pedestal portion 6. These protruding walls 63 accommodate the vicinity of the lower end portion of the guide portion 5.

A fixing plate portion 64 is provided inside the pedestal portion 6. The fixing plate portion 64 is arranged so as to cross the space 62 in the vicinity of the center in the front-rear direction of the space 62. The fixed plate portion 64 is arranged at a position comparable to the lower end portions of the plate-shaped portions 51 and 52 (the portion that protrudes the longest from the front surface of the rib 215) in the side view (see FIG. 5C). A through hole 64a for the sealing screw 71 is formed in the fixing plate portion 64 (see FIG. 5B). In the state where the fixing plate portion 64 is arranged in the pedestal portion 6, the through hole 64a is arranged at a position corresponding to the front portion of the opening 61 of the pedestal portion 6.

In the watt hour meter 1 according to the present embodiment, when the upper cover 3 is attached to the housing base 2, the sealing screw 71 attached to the upper cover 3 is guided to the pedestal portion 6 by the guide portion 5. Hereinafter, a mode in which the guide portion 5 guides the sealing screw 71 to the pedestal portion 6 will be described with reference to FIGS. 6 and 7. FIG. 6 is a front view of a state in which the watt hour meter 1 according to the present embodiment is being assembled. FIG. 7 is a cross-sectional view taken along the line AA shown in FIG.

When the upper cover 3 is put on the housing base 2 and slid, as shown in FIG. 6, the tip end (rear end portion) of the sealing screw 71 is housed in the groove portion 53 of the guide portion 5. .. Then, when the upper cover 3 is further slid downward with the tip portion accommodated in the groove portion 53, the sealing screw 71 moves to the front end of the guide portion 5 (more specifically, the plate-shaped portions 51 and 52). It slides on a surface (inclined surface). The sealing screw 71 is gradually pushed forward as it advances downward (see FIG. 7).

Further, when the upper cover 3 is slid downward, the claw portion 344 enters the engaging portion 216. At the same time, the sealing screw 71 enters the inside of the pedestal portion 6 through the opening 61, and the tip portion thereof enters the through hole 64a of the fixing plate portion 64. The assembler of the watt hour meter 1 performs the fastening work on the sealing screw 71 in the state where the tip portion has entered the through hole 64a in this way. Therefore, it is not necessary to position the tip of the sealing screw 71, and the fastening operation can be easily performed.

As described above, in the watt hour meter 1 according to the present embodiment, the upper cover 3 is provided by sliding and moving the housing base 2, and the upper cover 3 is provided with a sealing screw 71. The housing base 2 is provided with a pedestal portion 6 to which the sealing screw 71 is fastened, and the pedestal portion 6 is provided with a guide portion 5 for guiding the sealing screw 71. As a result, even when the upper cover 3 is provided with the sealing screw 71, it is possible to prevent the sealing screw 71 from interfering with a part of the housing base 2, so that the work of assembling the watt hour meter 1 is performed. Efficiency can be improved.

In particular, in the watt hour meter 1 according to the present embodiment, the guide portion 5 is provided with a groove portion 53 for accommodating the tip portion of the sealing screw 71. As a result, the tip portion of the sealing screw 71 can be accurately accommodated in the process of sliding the upper cover 3, so that the sealing screw 71 can be reliably guided to the pedestal portion 6.

Further, in the watt hour meter 1 according to the present embodiment, the upper cover 3 is attached to the housing base 2 by sliding the upper cover 3 from the upper side to the lower side of the housing base 2. As a result, the upper cover 3 can be put on the housing base 2 from the upper side. Therefore, it is possible to prevent rainwater or the like from entering the watt hour meter 1 as compared with the case where the cover member is attached to the housing base 2 from the front side.

Further, in the watt-hour meter 1 according to the present embodiment, the sealing screw 71 is arranged in front of the state in which the watt-hour meter is installed. Therefore, the operator who performs the assembly work after being guided to the pedestal portion 6 by the guide portion 5 can fasten the sealing screw 71 from the front side of the watt-hour meter 1. This makes it possible to simplify the fastening work.

The present invention is not limited to the above embodiment, and can be modified in various ways. In the above embodiment, the size and shape shown in the accompanying drawings are not limited to this, and can be appropriately changed within the range in which the effects of the present invention are exhibited. In addition, it can be appropriately modified and implemented as long as it does not deviate from the scope of the object of the present invention.

For example, in the above embodiment, the case where the width of the groove portion 53 provided in the guide portion 5 is the same width is described. However, the configuration of the guide unit 5 is not limited to this, and can be changed as appropriate. For example, in the guide portion 5, the width of the groove portion 53 may be narrowed along the slide direction of the upper cover 3. By configuring the guide portion 5 so that the width of the groove portion 53 is narrowed in this way, even if the sealing screw 71 slightly moves when the upper cover 3 is attached, the tip portion of the sealing screw 71 can be accurately accommodated. It can be guided to the pedestal portion 6.

Further, in the above-described embodiment, the case where the guide portion 5 is formed by the pair of plate-shaped portions 51 and 52 having a slope shape will be described. However, the configuration of the guide unit 5 is not limited to this, and can be changed as appropriate. For example, in the guide portion 5, a single protruding piece having a slope shape may be provided, and a groove portion 53 for guiding the sealing screw 71 to the pedestal portion 6 may be formed on the surface (front surface) of the protruding piece. good.

As described above, the present invention has an effect that the work efficiency at the time of assembling the watt-hour meter can be improved, and in particular, the electric power required for the work in which the operator needs to attach / detach the cover. Useful for watt-hour meters.

1: Electric energy meter 2: Housing base 211: Main body 212: Display 213 to 215: Rib 216: Engagement 217: Rib 217a: Upper side 217b: Side side 218: Protruding piece 3: Top cover 31: Front surface 32: Opening 33: Flat surface 33a: Through hole 5: Guide 51: Plate 52: Plate 53: Groove 6: Pedestal 61: Open 62: Space 63: Protruding wall 64: Fixing plate Part 64a: Through hole 7: Sealing structure part 71: Sealing screw 72: Sealing cap

Claims (5)

It is a housing structure of a watt hour meter including a housing base for accommodating a measurement circuit for measuring electric power and a cover member attached to the housing base by sliding the movement.
A fastening member for fastening the cover member to the housing base is attached to the cover member.
The housing structure of the watt hour meter is provided with a pedestal portion to which the fastening member is fastened and a guide portion for guiding the fastening member is provided on the housing base. The housing structure of the watt hour meter according to claim 1, wherein the guide portion is formed with a guide groove for accommodating the tip end portion of the fastening member. The housing structure of the watt hour meter according to claim 2, wherein the guide portion narrows the width of the guide groove along the sliding direction of the cover member. The watt-hour meter according to any one of claims 1 to 3, wherein the cover member is attached to the housing base by sliding it from the upper side to the lower side of the housing base. Housing structure. The housing structure of the watt-hour meter according to any one of claims 1 to 4, wherein the fastening member is arranged on the front surface of the watt-hour meter in a state where the watt-hour meter is installed.

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