Electricity meter

Abstract

To provide a watt-hour meter that prevents shorting between different polarity terminals of a terminal block when attached to a metering device.SOLUTION: A watt-hour meter has: a terminal block having a conductor connecting screw 7 for attaching a conductor-side terminal connection part 3b to a terminal-side conductor connection part 9b; and a cover, and includes: a terminal tip protection part 101 having a conductor insertion part 101c, a tip part 101a that covers the conductor-side terminal connection part, a recess 101b for the conductor connecting screw to avoid the screw head of the conductor connecting screw, and a fixing part 101e having a pawl part 101d; and a conductor-side hole 3A1 that fits to the pawl part of the fixing part. The conductor-side terminal connection part is inserted into the conductor insertion part and fixed by the pawl part being fitted into the conductor hole. When a metering device is attached to the terminal block in a state where a communication device is removed from the metering device, the screw head of the conductor connecting screw is inserted into the recess for the conductor connecting screw, and the conductor connecting screw is tightened up to connect the conductor-side terminal connection part to the terminal-side conductor connection part, thereby attaching the metering device to the terminal block.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an energy meter. [Background technology]

[0002] Conventionally, an electricity meter has a metering device, a communication device that is attached to the metering device and transmits the amount of electricity measured by the metering device to the outside, a terminal block, and a cover. Figures 7(a) to 7(d) are process diagrams showing the procedure for assembling the metering device, the terminal block, the communication device, and the cover in a conventional electricity meter. Figure 7(a) shows the direction in which the metering device is attached to the terminal block, Figure 7(b) shows the state in which the terminal block is attached to the metering device, Figure 7(c) shows the state in which the communication device is attached to the metering device, and Figure 7(d) shows the completed electricity meter with the cover attached to the terminal block.

[0003] 8(a) and (b) show exploded views of a conventional watt-hour meter. Fig. 9(a) shows the appearance of a conventional communication device for a watt-hour meter, and Fig. 9(b) shows a metering device mounting portion 24a provided on the communication device. As shown in Figures 8(a) and 8(b), the metering device is composed of a circuit section 1 having a display section 1a that displays the amount of electricity, a communication device connection section 1b, an open / close detection section 1c, a conductor connection section 1d, a sensor connection section 1e, and a base mounting section 1f, a sensor section 2 that has a sensor side circuit connection section 2a that connects to the sensor connection section 1e of the circuit section 1 and measures the current, a conductor 3 that has a conductor side circuit connection section 3a that connects to the conductor connection section 1d of the circuit section 1 to supply power and a conductor side terminal connection section 3b that connects to the terminal side conductor connection section 9b of the terminal 9 of the terminal block, a base 4 that has a communication device connection section through hole 4a, a communication device mounting section 4b, a block mounting section 4c, an open / close detection section through hole 4d, a case mounting section 4e, a conductor through hole 4f, and a circuit mounting section 4g, and a case 5 that houses the above and has a display window 5a, a case side base mounting section 5b, a case waterproof rib storage section 5c, a case waterproof rib 5d, and a case side fixing screw mounting section 5e.

[0004] As shown in Figs. 9(a) and 9(b), the communication device has a weighing device connecting part 21a and a weighing device mounting part 24a.

[0005] As shown in Figures 8(a) and 8(b), the terminal block is composed of a block mounting screw 6, a conductor connection screw 7, a wire mounting screw 8, a terminal 9 having a wire storage section 9a and a terminal side conductor connection section 9b, and a block 10 having a block side base mounting section 10a, a female threaded section 10b for cover mounting, a wire passing hole 10c, a terminal mounting section 10d, a block side fixing screw mounting section 10e, and a block waterproof rib storage section 10f.

[0006] As shown in FIGS. 8(a) and 8(b), the cover is composed of a cover 11 having a detection convex portion 11a and a cover waterproofing rib 11b, and a cover mounting screw 12.

[0007] The procedure for assembling the thus configured metering device, communication device, terminal block, and cover to the electricity meter is as follows: First, as shown in Fig. 7(a), the metering device is placed above the terminal block and then moved downward, so that the metering device is fitted to the terminal block as shown in Fig. 7(b).

[0008] Thereafter, the conductor side terminal connection portion 3b of the weighing device is fixed to the terminal side conductor connection portion 9b of the terminal 9 with the conductor connection screw 7 of the terminal block, and the block mounting portion 4c of the weighing device is fixed to the block side base mounting portion 10a of the terminal block with the block mounting screw 6, thereby attaching the weighing device to the terminal block.

[0009] At this time, the case waterproof rib 5d of the case 5 is stored in the block waterproof rib storage portion 10f of the block 10. Thereafter, as shown in Fig. 7(c), the weighing device mounting portion 24a of the communication device is fitted into the communication device mounting portion 4b of the weighing device base 4, and the weighing device connection portion 21a of the communication device is connected to the communication device connection portion 1b of the circuit unit 1 through the communication device connection portion through hole 4a of the weighing device base 4, thereby mounting the communication device to the weighing device.

[0010] Then, as shown in FIG. 7(d), the cover waterproof rib of the cover 11 is inserted into the case waterproof rib storage portion of the case 5, and the cover mounting screw 12 provided on the cover 11 is attached to the cover mounting female thread portion 10b of the block 10, thereby assembling the electricity meter.

[0011] When replacing a metering device by reusing an installed terminal block, it is necessary to loosen the block mounting screws 6 and conductor connection screws 7 of the terminal block, remove the old metering device, place the new metering device on the terminal block, and then tighten the terminal block mounting screws 6 and conductor connection screws 7 to secure it in place.

[0012] As an example of reference, there is an electricity meter that does not require disconnecting the power supply side power supply conductors and the load side power supply conductors that are connected to the terminal block, and allows the power supply control device to be attached and detached easily and safely. [Prior art documents] [Patent documents]

[0013] [Patent Document 1] Patent No. 4991340 Summary of the Invention [Problem to be solved by the invention]

[0014] When replacing an electricity meter, when the old metering device is removed by loosening the terminal block mounting screws and conductor connection screws and a new metering device is attached to the terminal block, there is a possibility that the terminal connection of the metering device may short-circuit the opposite pole terminals of the terminal block.

[0015] The present invention provides a watt-hour meter capable of preventing a short circuit between terminals of different poles of a terminal block when a metering device is attached. [Means for solving the problem]

[0016] In order to solve the above problem, claim 1 of the present invention provides a measuring device including a plate-shaped conductor having a conductor side terminal connection portion, a communication device attached to the measuring device and configured to transmit to the outside an amount of electric power metered by the measuring device, a terminal including a terminal side conductor connection portion for connecting an electric wire and the conductor side terminal connection portion of the conductor, a terminal block including a conductor connection screw for attaching the conductor side terminal connection portion of the conductor to the terminal side conductor connection portion of the terminal, and a cover for covering the measuring device, the communication device, and the terminal block, wherein a terminal tip protection part of an insulator is provided having a snap-fit ​​structure fixing part having a conductor insertion part which is a recess for inserting the conductor side terminal connection portion of the conductor, a tip part covering a tip end of the conductor side terminal connection portion of the conductor and a recess for a conductor connection screw and a claw part as a recess for preventing abutment between the tip end of the conductor side terminal connection portion of the conductor and a screw head of the conductor connection screw, a conductor side hole part which is a hole for engaging with the claw part of the fixing part of the terminal tip protection part and fixing the conductor, and the conductor side terminal connection portion of the conductor is inserted into the conductor insertion part of the terminal tip protection part, The claw portion of the fixing portion of the terminal tip protection portion is engaged with the conductor side hole portion of the conductor, whereby the terminal tip protection portion is fixed to the conductor. When the weighing device is attached to the terminal block, the conductor side terminal connection portion of the conductor is inserted between the terminal side conductor connection portion of the terminal and the screw head of the conductor connection screw, and at the same time, the screw head of the conductor connection screw is inserted into the conductor connection screw recess of the terminal tip protection portion, and the conductor connection screw is tightened to connect the conductor side terminal connection portion of the conductor to the terminal side conductor connection portion of the terminal. This structure allows the metering device to be attached to the terminal block by connecting it to a connection part, and when replacing an energized watt-hour meter, the conductor connection screw is loosened to remove the old metering device and a new metering device is attached to the terminal block.If the tip of the conductor side terminal connection part of the conductor accidentally comes into contact with adjacent terminals of different poles when the tip of the terminal tip protection part, which is an insulator, comes into contact before the conductor side terminal connection part of the conductor, thereby preventing a short circuit between the terminals of different poles.

[0017] The invention of claim 2 comprises a metering device including a base having a conductor passing hole and a plate-shaped conductor having a conductor side terminal connection portion, a communication device attached to the metering device and transmitting an amount of electric power metered by the metering device to an outside, a terminal including a terminal side conductor connection portion for connecting an electric wire and to the conductor side terminal connection portion of the conductor, a terminal block including a conductor connection screw for attaching the conductor side terminal connection portion of the conductor to the terminal side conductor connection portion of the terminal, and a cover for covering the metering device, the communication device, and the terminal block, wherein a conductor insertion portion is a recess into which the conductor side terminal connection portion of the conductor is inserted, and a terminal tip protection portion having a conductor connection screw recess and a hook portion as a recess for preventing abutment between a tip portion covering a tip end of the conductor side terminal connection portion of the conductor and a screw head of the conductor connection screw, and a base side recess is provided in the conductor passing hole of the base as a recess that fits into the hook portion of the terminal tip protection portion, and the tip portion of the terminal tip protection portion is inserted into the conductor passing hole of the base, and the hook portion of the terminal tip protection portion is attached to the base. and after the conductor side terminal connection portion of the conductor is fitted into the base-side recess of the terminal tip protection portion, the conductor side terminal connection portion of the conductor is inserted into the conductor insertion portion of the terminal tip protection portion and fixed; when the metering device is attached to the terminal block, the conductor side terminal connection portion of the conductor is inserted between the terminal side conductor connection portion of the terminal and the screw head of the conductor connection screw, and at the same time, the screw head of the conductor connection screw is inserted into the conductor connection screw recess of the terminal tip protection portion. The metering device can be attached to and assembled on the terminal block by tightening the conductor connection screw to connect the conductor side terminal connection portion of the conductor to the terminal side conductor connection portion of the terminal. When replacing an energized watt-hour meter, if the tip of the conductor side terminal connection portion of the conductor accidentally comes into contact with adjacent terminals of different poles when the conductor connection screw is loosened to remove the old metering device and a new metering device is attached to the terminal block, the tip of the terminal tip protection portion, which is an insulator, comes into contact before the conductor side terminal connection portion of the conductor, thereby preventing a short circuit between the terminals of different poles.

[0018] The invention of claim 3 includes a metering device including a base having a conductor passing hole and a plate-shaped conductor having a conductor side terminal connection portion, a communication device attached to the metering device and configured to transmit an amount of electric power measured by the metering device to an outside, a terminal including a terminal side conductor connection portion for connecting an electric wire and the terminal block including a conductor connection screw for attaching the conductor side terminal connection portion of the conductor to the terminal side conductor connection portion of the terminal, and a cover for covering the metering device, the communication device, and the terminal block, wherein the base is provided with a conductor insertion portion for inserting the conductor and a terminal tip protection portion of an insulator having a conductor connection screw recess as a recess for preventing abutment between a tip portion covering a tip end of the conductor side terminal connection portion of the conductor and a screw head of the conductor connection screw, and the conductor side terminal connection portion of the conductor is inserted into the conductor passing hole of the base and the conductor insertion portion of the base and fixed, When attaching a metering device to the terminal block, the conductor side terminal connection portion of the conductor is inserted between the terminal side conductor connection portion of the terminal and the screw head of the conductor connection screw, and at the same time, the screw head of the conductor connection screw is inserted into the conductor connection screw recess of the base, and the conductor connection screw is tightened to connect the conductor side terminal connection portion of the conductor to the terminal side conductor connection portion of the terminal, thereby attaching and assembling the metering device to the terminal block.When replacing an energized watthour meter, if the conductor connection screw is loosened to remove the attached old metering device and a new metering device is attached to the terminal block, if the tip of the conductor side terminal connection portion of the conductor accidentally comes into contact with adjacent terminals of different poles, the tip of the terminal tip protection portion of the base, which is an insulator, comes into contact before the conductor side terminal connection portion of the conductor, thereby preventing a short circuit between the terminals of different poles. Effect of the Invention

[0019] According to the invention of claim 1, by covering the tip of the conductor side terminal connection part with the terminal tip protection part made of an insulator, if the tip of the conductor side terminal connection part accidentally comes into contact with adjacent terminals of different polarity when attaching the weighing device to the terminal block, the terminal tip protection part, which is an insulator, will come into contact before the conductor side terminal connection part, thereby preventing a short circuit between the terminals of different polarity.

[0020] According to the invention of claim 2, in contrast to claim 1, the terminal end protection part is fixed to the base, so that the terminal end protection part can be prevented from coming off.

[0021] According to the invention of claim 3, in contrast to claim 2, the terminal tip protection portion is integrated with the base, so that the manufacturing cost can be reduced. [Brief description of the drawings]

[0022] [Figure 1] 1A and 1B are a perspective view and a cross-sectional view of a watt-hour meter according to a first embodiment of the present invention; [Diagram 2] 1 is a perspective view of a metering device and a terminal tip protection part of an electricity meter according to a first embodiment of the present invention. FIG. [Diagram 3] 5A and 5B are a perspective view and a cross-sectional view of a watt-hour meter according to a second embodiment of the present invention. [Figure 4] 11 is an exploded view of a metering device of an electricity meter according to a second embodiment of the present invention, and a perspective view of a terminal tip protection part. FIG. [Diagram 5] 11A and 11B are a perspective view and a cross-sectional view of a watt-hour meter according to a third embodiment of the present invention. [Figure 6] FIG. 11 is a perspective view of a base of a watthour meter according to a third embodiment of the present invention. [Figure 7] FIG. 1 is a perspective view of a conventional watt-hour meter. [Figure 8] FIG. 1 is an exploded view of a conventional watt-hour meter. [Figure 9] FIG. 1 is a perspective view of a conventional communication device for an electricity meter. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a watt-hour meter according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0024] (First embodiment) Fig. 1(a) to Fig. 1(d) are perspective and cross-sectional views of a watt-hour meter according to a first embodiment of the present invention. Fig. 1(a) shows the direction in which a metering device is attached to a terminal block, and Fig. 1(b) shows the state in which the terminal block is attached to the metering device. Fig. 1(c) shows a cross-sectional view of the watt-hour meter shown in Fig. 1(a). Fig. 1(d) shows a cross-sectional view of the watt-hour meter shown in Fig. 1(b).

[0025] 2(a) to 2(c) are perspective views of the metering device and the terminal tip protection part of the electricity meter. Fig. 2(a) shows a state in which the base is attached to the case, and Fig. 2(b) and Fig. 2(c) are perspective views of the terminal tip protection part.

[0026] The electricity meter has a metering device, a communication device (upper case 23 and lower case 24 shown in Figure 9) that is attached to the metering device and transmits the amount of electricity measured by the metering device to the outside, a terminal block, a cover, and a terminal tip protection part 101.

[0027] The weighing device includes a case 5, a base 4 housed in the case 5, and a conductor 3A attached to the base 4. The conductor 3A is provided with a conductor-side terminal connection portion 3Ab having a two-pronged tip connected to a terminal 9, and a conductor-side hole portion 3A1 that fits into a claw portion 101d of a fixing portion 101e of a terminal tip protection portion 101.

[0028] The terminal block includes terminals 9 each having a terminal-side conductor connecting portion 9b for connecting to the conductor 3A and a conductor connecting screw 7 for attaching the conductor-side terminal connecting portion 3Ab to the terminal-side conductor connecting portion 9b. The cover covers the metering device, the communication device, and the terminal block.

[0029] The terminal tip protection portion 101 is made of an insulator and, as shown in Figures 2(b) and 2(c), has a tip portion 101a that covers the conductor side terminal connection portion 3Ab, a conductor connection screw recess 101b that avoids the screw head of the conductor connection screw 7, a conductor insertion portion 101c for inserting the conductor 3A, and a fixing portion 101e of a snap-fit ​​structure having a claw portion 101d.

[0030] Next, the operation of the watt-hour meter of the first embodiment thus configured will be described. First, when the conductor-side terminal connection part 3Ab shown in Fig. 2(a) is inserted into the conductor insertion part 101c of the terminal tip protection part 101 shown in Fig. 2(c), the claw part 101d of the terminal tip protection part 101 fits into the conductor-side hole part 3A1 as shown in Fig. 1(c), and the terminal tip protection part 101 is fixed.

[0031] When the communication device is removed from the weighing device and the weighing device is attached to the terminal block, there is a gap between the head of the conductor connection screw 7 and the terminal side conductor connection part 9b, as shown in Figure 1(c). When the weighing device is lowered onto the terminal block from above, the threaded part of the conductor connection screw 7 is inserted between the two ends of the conductor side terminal connection part 3Ab, and at the same time, the conductor connection screw recess 101b of the terminal tip protection part 101 clears the head of the conductor connection screw 7, as shown in Figures 1(b) and 1(d).

[0032] Next, the conductor connecting screw 7 is tightened to connect the conductor side terminal connecting portion 3Ab to the terminal side conductor connecting portion 9b, thereby mounting the weighing device to the terminal block.

[0033] Thus, according to the electricity meter of the first embodiment, the tip of the conductor side terminal connection portion 3Ab is covered with the terminal tip protection portion 101 made of an insulator. Therefore, if the tip of the conductor side terminal connection portion 3Ab accidentally comes into contact with adjacent terminals of different polarity when the metering device is attached to the terminal block, the terminal tip protection portion 101, which is an insulator, will come into contact before the conductor side terminal connection portion 3Ab, thereby preventing a short circuit between the terminals of different polarity.

[0034] The same effect can be obtained by changing the terminal tip protection portion 101 to have only the claw portion 101d (convex portion) instead of the snap-fit ​​structure fixing portion 101e having the claw portion 101d, and by changing the conductor 3A to a concave portion instead of the conductor side hole portion 3A1.

[0035] Second Embodiment Figures 3(a) to 3(d) are perspective and cross-sectional views of a watt-hour meter according to a second embodiment of the present invention. Figure 3(a) shows the direction in which a metering device is attached to a terminal block, and Figure 3(b) shows the state in which the terminal block is attached to the metering device. Figure 3(c) shows a cross-sectional view of the watt-hour meter shown in Figure 3(a). Figure 3(d) shows a cross-sectional view of the watt-hour meter shown in Figure 3(b).

[0036] 4(a) to 4(c) are perspective views of a metering device and a terminal tip protection part of the electricity meter. Fig. 4(a) shows an assembly diagram of the periphery of the base, and Fig. 4(b) and Fig. 4(c) show perspective views of the terminal tip protection part.

[0037] The electricity meter includes a metering device, a communication device that is attached to the metering device and transmits the amount of electricity metered by the metering device to the outside, a terminal block, and a cover.

[0038] The weighing device includes a case 5, a base 4B housed in the case 5, a terminal tip protection part 201 attached to the base 4B, and a conductor 3 attached to the terminal tip protection part 201. As shown in Fig. 4(a), the base 4B has a conductor passing hole 4Bf and a base side recess 4B1, and the conductor 3 has a conductor side terminal connection part 3b.

[0039] The terminal tip protection portion 201 is made of an insulator and, as shown in Figures 4(b) and 4(c), has a tip portion 201a that covers the conductor side terminal connection portion 3b, a conductor connection screw recess 201b that avoids the screw head of the conductor connection screw 7, a conductor insertion portion 201c for inserting the conductor 3, and a hook portion 201f that engages with the base side recess 4B1.

[0040] The terminal block is provided with terminals 9 each having a terminal-side conductor connecting portion 9b for connecting with the conductor 3, and a conductor connecting screw 7 for attaching the conductor-side terminal connecting portion 3b to the terminal-side conductor connecting portion 9b. The cover covers the metering device, the communication device and the terminal block.

[0041] Next, the operation of the watt-hour meter of the second embodiment thus configured will be described. First, as shown in Fig. 4(a), the tip 201a of the terminal tip protection part 201 is inserted into the conductor through hole 4Bf of the base 4B, the hook part 201f of the terminal tip protection part 201 is engaged with the base side recess 4B1 of the base 4B, the conductor side terminal connection part 3b is inserted into and fixed to the conductor insertion part 201c of the terminal tip protection part 201, and the board 1 and the case 5 are attached to assemble the metering device.

[0042] When the communication device is removed from the weighing device and the weighing device is attached to the terminal block, there is a gap between the head of the conductor connection screw 7 and the terminal side conductor connection portion 9b, as shown in Figure 3(c). When the weighing device is lowered onto the terminal block from above, the threaded portion of the conductor connection screw 7 is inserted between the two ends of the conductor side terminal connection portion 3b, and at the same time, the conductor connection screw recess 201b of the terminal tip protection portion 201 clears the head of the conductor connection screw 7, as shown in Figures 3(b) and 3(d).

[0043] Next, the conductor connection screw 7 is tightened to connect the conductor side terminal connection portion 3b to the terminal side conductor connection portion 9b, thereby mounting the weighing device to the terminal block.

[0044] Thus, in the watthour meter according to the second embodiment, unlike the watthour meter according to the first embodiment, the hook portion 201f of the terminal tip protection portion 201 fits into the base side recess 4B1 of the base 4B. That is, since the terminal tip protection portion 201 is fixed to the base 4B, it is possible to prevent the terminal tip protection portion 201 from coming off.

[0045] (Third embodiment) Fig. 5(a) to Fig. 5(d) are perspective and cross-sectional views of a watt-hour meter according to a third embodiment of the present invention. Fig. 5(a) shows the direction in which a metering device is attached to a terminal block, and Fig. 5(b) shows the state in which the terminal block is attached to the metering device. Fig. 5(c) shows a cross-sectional view of the watt-hour meter shown in Fig. 5(a). Fig. 5(d) shows a cross-sectional view of the watt-hour meter shown in Fig. 5(b). Fig. 6 is a perspective view of the base of the watt-hour meter.

[0046] The electricity meter includes a metering device, a communication device that is attached to the metering device and transmits the amount of electricity metered by the metering device to the outside, a terminal block, and a cover.

[0047] The weighing device includes a case 5, a base 4C housed in the case 5, and a conductor 3 having a conductor-side terminal connection portion 3b.

[0048] As shown in Figure 6, the base 4C is provided with a terminal tip protection portion 4C2 having a conductor through hole 4Cf, a tip portion 4C3 that covers the conductor side terminal connection portion 3b, a conductor connection screw recess 4C4 that avoids the screw head of the conductor connection screw 7, and a conductor insertion portion 4C5 into which the conductor 3 is inserted.

[0049] The terminal block is provided with terminals 9 each having a terminal-side conductor connecting portion 9b for connecting with the conductor 3, and a conductor connecting screw 7 for attaching the conductor-side terminal connecting portion 3b to the terminal-side conductor connecting portion 9b. The cover covers the metering device, the communication device and the terminal block.

[0050] Next, the operation of the watt-hour meter of the third embodiment configured as above will be described. First, as shown in Fig. 5(c), the conductor-side terminal connection portion 3b is inserted into the conductor through-hole 4Cf and the conductor insertion portion 4C5 of the base 4C and fixed, and the substrate 1 and the case 5 are attached to assemble the metering device.

[0051] When the communication device is removed from the weighing device and the weighing device is attached to the terminal block, there is a gap between the head of the conductor connection screw 7 and the terminal side conductor connection portion 9b, as shown in Figure 5(c). When the weighing device is lowered onto the terminal block from above, the threaded portion of the conductor connection screw 7 is inserted between the two ends of the conductor side terminal connection portion 3b, and at the same time, the conductor connection screw recess 4C4 of the terminal tip protection portion 4C2 clears the head of the conductor connection screw 7, as shown in Figures 5(b) and 5(d).

[0052] Next, the conductor connection screw 7 is tightened to connect the conductor side terminal connection portion 3b to the terminal side conductor connection portion 9b, thereby mounting the weighing device to the terminal block.

[0053] Thus, in the watthour meter according to the third embodiment, the terminal tip protection portion 4C2 is integrated with the base 4C, unlike the second embodiment, and therefore the manufacturing cost can be reduced. [Explanation of symbols]

[0054] 1 Circuit section 1a Display section 1b Communication device connection section 1c Open / close detector 1d Conductor connection 1e Sensor connection 1f Base mounting part 2 Sensor section 2a Sensor side circuit connection 3,3A conductor 3a, 3Aa Conductor side circuit connection part 3b, 3Ab Conductor side terminal connection part 3A1 Conductor side hole 4,4B Base 4a, 4Ba, 4Ca Communication device connection through hole 4b, 4Bb, 4Cb Communication device mounting section 4c, 4Bc, 4Cc Block mounting part 4d, 4Bd, 4Cd Open / close detection hole 4e, 4Be, 4Ce case mounting part 4f, 4Bf, 4Cf Conductor holes 4g, 4Bg, 4Cg Circuit mounting part 4B1 Base side recess 4C2 Terminal tip protection part 4C3 Tip 4C4 Conductor connection screw recess 4C5 Conductor insertion part 5 Cases 5a Display window 5b Case side base mounting part 5c Case waterproof rib storage area 5d Case waterproof rib 5e Case side fixing screw attachment part 6 Block mounting screws 7 Conductor Connection Screw 8 Wire mounting screw 9 Terminals 9a Wire storage section 9b Terminal side conductor connection part 10 Blocks 10a Block side base mounting part 10b Female thread for mounting cover 10c Wire hole 10d Terminal mounting part 10e Block side fixing screw mounting part 10f Block waterproof rib storage section 11 Cover 11a Detection protrusion 11b Cover waterproof rib 12 Cover mounting screw 21 Cable 21a Metering device connection 22 LED light guide 23 Upper case 24 Lower case 24a Metering device mounting part 101,201 Terminal tip protection part 101a,201a Tip 101b, 201b Conductor connection screw recess 101c, 201c Conductor insertion section 101d Claw part 101e Fixed part 201f Hook

Claims

1. a terminal block including a conductor connection screw for attaching the conductor side terminal connection portion of the conductor to the terminal side conductor connection portion of the terminal; and a cover for covering the metering device, the communication device, and the terminal block, wherein a terminal tip protection part of an insulator is provided having a snap-fit ​​structure fixing part having a conductor insertion part which is a recess for inserting the conductor side terminal connection portion of the conductor, a tip part covering a tip end of the conductor side terminal connection portion of the conductor and a conductor connection screw recess and a claw part as a recess for preventing contact between the tip end of the conductor side terminal connection portion of the conductor and a screw head of the conductor connection screw, and a conductor side hole part which is a hole for engaging with the claw part of the fixing part of the terminal tip protection part and fixing the conductor, the conductor side terminal connection portion of the conductor is inserted into the conductor insertion part of the terminal tip protection part, and the fixing part of the terminal tip protection part is provided with a conductor side hole part which is a hole for engaging with the claw part of the fixing part of the terminal tip protection part and fixing the conductor side terminal connection portion of the conductor to the outside, a terminal block for connecting the conductor side terminal connection portion of the conductor to the terminal side conductor connection portion of the terminal; a terminal block for connecting the conductor side terminal connection portion of the conductor to the terminal side conductor connection portion of the terminal; a terminal block for connecting the conductor side terminal connection portion of the conductor to the terminal side conductor connection portion of the terminal;

2. a terminal block including a conductor connection screw for attaching the conductor side terminal connection portion of the conductor to the terminal side conductor connection portion of the terminal; and a cover for covering the metering device, the communication device, and the terminal block, wherein a conductor insertion portion is a recess into which the conductor side terminal connection portion of the conductor is inserted, and a terminal tip protection portion is provided having a conductor connection screw recess and a hook portion as a recess for preventing abutment between a tip portion covering a tip end of the conductor side terminal connection portion of the conductor and a screw head of the conductor connection screw, and a base side recess is provided in the conductor through hole of the base which is a recess that fits with the hook portion of the terminal tip protection portion, and the tip portion of the terminal tip protection portion is inserted into the conductor through hole of the base, and the hook portion of the terminal tip protection portion is attached to the base side recess of the base. and after the tip of the conductor side terminal connection part of the conductor is fitted into the terminal side recess of the terminal tip protection part, the conductor side terminal connection part of the conductor is inserted into the conductor insertion part of the terminal tip protection part and fixed; and when the metering device is attached to the terminal block, the conductor side terminal connection part of the conductor is inserted between the terminal side conductor connection part of the terminal and the screw head of the conductor connection screw, and at the same time, the screw head of the conductor connection screw is inserted into the conductor connection screw recess of the terminal tip protection part. The metering device can be attached to and assembled with the terminal block by tightening the conductor connection screw to connect the conductor side terminal connection part of the conductor to the terminal side conductor connection part of the terminal. When replacing an energized watthour meter, if the tip of the conductor side terminal connection part of the conductor accidentally comes into contact with adjacent terminals of different poles when the conductor connection screw is loosened to remove the old metering device and the new metering device is attached to the terminal block, the tip of the terminal tip protection part, which is an insulator, comes into contact before the conductor side terminal connection part of the conductor, thereby preventing a short circuit between the terminals of different poles.

3. a terminal block having a conductor connection screw for attaching the conductor side terminal connection portion of the conductor to the terminal side conductor connection portion of the terminal; and a cover for covering the metering device, the communication device, and the terminal block. The metering device includes a conductor insertion portion for inserting the conductor into the base, and a terminal tip protection portion of an insulator having a conductor connection screw recess as a recess for preventing abutment between a tip portion covering a tip end of the conductor side terminal connection portion of the conductor and a screw head of the conductor connection screw. The conductor side terminal connection portion of the conductor is inserted into the conductor insertion portion of the base and fixed in place in the conductor insertion portion of the base. When attaching the watt-hour meter to the terminal block, the conductor side terminal connection portion of the conductor is inserted between the terminal side conductor connection portion of the terminal and the screw head of the conductor connection screw, and at the same time, the screw head of the conductor connection screw is inserted into the conductor connection screw recess of the base, and the conductor connection screw is tightened to connect the conductor side terminal connection portion of the conductor to the terminal side conductor connection portion of the terminal, thereby attaching and assembling the metering device to the terminal block. When replacing an energized watt-hour meter, if the tip of the conductor side terminal connection portion of the conductor accidentally comes into contact with adjacent terminals of different poles when the conductor connection screw is loosened to remove the old metering device and the new metering device is attached to the terminal block, the tip of the terminal tip protection portion of the base, which is an insulator, comes into contact before the conductor side terminal connection portion of the conductor, thereby preventing a short circuit between the terminals of different poles.

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