CN118234214A

CN118234214A - Intelligent ammeter capable of preventing strong magnetic interference

Info

Publication number: CN118234214A
Application number: CN202410341250.5A
Authority: CN
Inventors: 宋晓峰; 张世权; 彭柳源
Original assignee: Guangzhou Hoko Electric Co ltd
Current assignee: Guangzhou Hoko Electric Co ltd
Priority date: 2024-03-25
Filing date: 2024-03-25
Publication date: 2024-06-21

Abstract

The invention discloses a strong magnetic interference prevention intelligent ammeter, which relates to the technical field of intelligent ammeters and comprises a watchcase and an anti-interference unit; watch case: the inside is provided with a mounting groove, the rear side of the mounting groove is fixedly provided with a circuit board frame, the inside of the watch case is provided with a wiring frame, the inside of the wiring frame is fixedly provided with a wiring terminal, the front side surface of the watch case is matched with the rear side surface of the shell cover, the inside of the mounting groove is provided with a heat dissipation unit, and the outside of the wiring frame is provided with a protection unit; anti-interference unit: contain strong magnetic shielding cover, runner, screw rod, adjustment tank and clamping frame, this prevent strong magnetic interference's smart electric meter adopts strong magnetic shielding cover can prevent that the electrical components on circuit board surface from receiving the influence of strong magnetism and leading to follow-up inaccurate problem that detects, prevents simultaneously that strong magnetic shell then can prevent that binding post from receiving the influence of strong magnetism, and the earth connection cooperation electrically conductive frame then can electromagnetic wave leading-in ground simultaneously, reduces the influence of magnetism to equipment.

Description

Intelligent ammeter capable of preventing strong magnetic interference

Technical Field

The invention relates to the technical field of intelligent electric meters, in particular to an intelligent electric meter capable of preventing strong magnetic interference.

Background

The intelligent ammeter is one of basic equipment for collecting data of an intelligent power grid, bears the tasks of collecting, metering and transmitting original electric energy data, is a foundation for realizing information integration, analysis optimization and information display, has the metering function of basic electric consumption of the traditional electric energy meter, has the intelligent functions of bidirectional multi-rate metering function, user side control function, bidirectional data communication function of various data transmission modes, electricity larceny prevention function and the like for adapting to the use of the intelligent power grid and new energy, and is required to ensure the accuracy of electricity consumption because the intelligent ammeter is collecting current, so that the function of ensuring the strong magnetism of the intelligent ammeter is required, otherwise, the collected data of the intelligent ammeter is possibly influenced by the strong magnetism to have errors, most of the adopted means for preventing the strong magnetic interference of the intelligent ammeter are single, and only a plastic shell is adopted for shielding, so that the normal use of the intelligent ammeter is difficult to ensure under the condition that the external strong magnetic interference is more and more.

Disclosure of Invention

The invention aims to overcome the existing defects, and provides the intelligent ammeter capable of preventing strong magnetic interference, which can prevent the problem of inaccurate subsequent detection caused by the influence of strong magnetic on an electric element on the surface of a circuit board by adopting a strong magnetic shielding cover, meanwhile, a strong magnetic shielding shell can prevent a wiring terminal from being influenced by the strong magnetic, and meanwhile, a grounding wire matched with a conductive frame can guide an electromagnetic wave into the ground, so that the influence of the magnetic property on equipment is reduced, and the problems in the background art can be effectively solved.

In order to achieve the above purpose, the present invention provides the following technical solutions: a smart electric meter capable of preventing strong magnetic interference comprises a watchcase and an anti-interference unit;

Watch case: the inside is provided with a mounting groove, the rear side of the mounting groove is fixedly provided with a circuit board frame, the inside of the watch case is provided with a wiring frame, the inside of the wiring frame is fixedly provided with a wiring terminal, the front side surface of the watch case is matched with the rear side surface of the shell cover, the inside of the mounting groove is provided with a heat dissipation unit, and the outside of the wiring frame is provided with a protection unit;

anti-interference unit: the novel magnetic shielding device comprises a strong magnetic shielding cover, a rotating wheel, a screw rod, an adjusting groove and a clamping frame, wherein the strong magnetic shielding cover is spliced with the inside of an installing groove, the clamping groove is formed in the top surface of the strong magnetic shielding cover, the adjusting groove is formed in the rear side surface of the installing groove, the screw rod is rotationally connected in the adjusting groove, the rotating wheel is arranged on the top surface of a watchcase, the bottom end of the rotating wheel is connected with the top end of the screw rod, the screw rod is in threaded connection with a screw hole on the surface of the clamping frame, and the clamping frame slides in the adjusting groove;

Wherein: the device also comprises a controller, wherein the controller is arranged on the front side surface of the shell cover, and the input end of the controller is electrically connected with the output end of an external power supply.

The wiring terminal is inserted into the wiring frame, so that the circuit board can be connected with external equipment, the strong magnetic shielding cover is inserted into the installation groove, the rotating wheel is rotated to enable the clamping frame to be clamped into the clamping groove to fix the strong magnetic shielding cover, and the strong magnetic shielding cover can effectively play an isolated role on external strong magnetism so as to ensure that the intelligent ammeter is normally used.

Further, anti-interference unit still includes lid, line frame, places box, earth connection and electrically conductive frame, place the left surface of box at the watchcase, the left surface sliding connection who places the box has the lid, the inside of placing the box is fixed with the earth connection, electrically conductive frame is installed to the outside end of earth connection, takes out suitable length with winding earth connection on the line frame, fixes electrically conductive frame subaerial with the electromagnetic wave guide ground, reduces the influence of magnetism to equipment.

Furthermore, the anti-interference unit further comprises a filter and anti-magnetic glass, the filter is fixed on the rear side face of the mounting groove, the anti-magnetic glass is mounted on the front side face of the shell cover, the input end of the filter is electrically connected with the output end of the controller, the filter is connected with the circuit board, electromagnetic interference signals can be blocked or weakened on a specific frequency band, and the influence of a magnetic field on a display and electronic elements on the circuit board can be reduced by matching with the mounted anti-magnetic glass.

Further, the radiating unit contains frame, fan, louvre, dust screen, dog and recess, the frame has two and fixes respectively in the left and right sides face of mounting groove, the fan has been placed to the inside of frame, the trailing flank at the mounting groove is seted up to the louvre, the trailing flank at the watchcase is seted up to the recess, the inside rotation of recess is connected with the dog, the dog looks joint with the through-hole on dust screen surface, the output of the input electricity connection director of fan rotates the dog and fixes the dust screen inside the recess, can prevent debris such as dust through the louvre entering influence smart electric meter's heat dissipation like this, and the fan then can discharge the heat of smart electric meter inside simultaneously to reach radiating purpose.

Further, the protection unit contains elasticity lug, fixed orifices, prevents strong magnetic shell and sign frame, elasticity lug has two and fixes the left and right sides face at the wiring frame respectively, prevent that the fixed orifices of the corresponding joint of strong magnetic shell and elasticity lug have all been seted up to the left and right sides face, prevent that the leading flank evenly distributed of strong magnetic shell has the sign frame, prevents that strong magnetic shell installs the outside of wiring frame, makes elasticity lug and fixed orifices cooperation fix, can solve strong magnetism like this and cause the influence to terminal, and the sign frame that sets up simultaneously then makes things convenient for personnel to distinguish the terminal that corresponds.

Further, the heat dissipation unit contains still includes temperature sensor, temperature sensor installs the top at the mounting groove trailing flank, temperature sensor's output electricity connection director's input, temperature sensor can detect the inside temperature of smart electric meter in real time to prevent that the high temperature from causing the circuit board to damage.

Further, still include sealing washer and inserted block, the both ends of sealing washer leading flank all are fixed with the inserted block, the inserted block is pegged graft mutually with the slot of cap trailing flank, and the inserted block is pegged graft mutually with the slot and is fixed the sealing washer, can prevent like this that liquid from getting into from junction gap and causing smart electric meter damage.

Further, the intelligent ammeter monitoring device further comprises a wireless transmitter, the wireless transmitter is fixed on the top surface of the watchcase, the output end of the wireless transmitter is electrically connected with the input end of the controller, and the wireless transmitter can transmit data detected by the intelligent ammeter to electronic equipment of a person in real time, so that the person can conveniently and remotely check the data.

Further, the intelligent ammeter alarm lamp further comprises two alarm lamps, the two alarm lamps are respectively fixed on the left side surface and the right side surface of the watchcase, the input end of each alarm lamp is electrically connected with the output end of the controller, and each alarm lamp can be turned on when the intelligent ammeter breaks down, so that personnel can conveniently recognize the intelligent ammeter alarm lamp.

Further, the intelligent ammeter further comprises a magnetic coating, wherein the magnetic coating is uniformly coated on the surfaces of the watchcase and the shell cover, and the magnetic coating coated by epoxy resin can effectively isolate external magnetism so as to improve the strong magnetic interference resistance of the intelligent ammeter.

Compared with the prior art, the invention has the beneficial effects that: this prevent strong magnetic interference's smart electric meter has following benefit:

1. can be connected circuit board and external equipment through the inside binding post of wiring frame to insert the inside of mounting groove with strong magnetic shielding cover, rotate the runner and make the card frame card advance the draw-in groove inside come fixed strong magnetic shielding cover, and strong magnetic shielding cover can effectually play isolated effect to external strong magnetism, in order to guarantee the normal use of smart electric meter

2. The grounding wire wound on the wire frame is taken out to a proper length, the conductive frame is fixed on the ground to guide the electromagnetic wave into the ground, the influence of magnetism on equipment is reduced, the filter is connected with the circuit board, electromagnetic interference signals can be blocked or weakened on a specific frequency band, and the influence of a magnetic field on a display and electronic elements on the circuit board can be reduced by matching with the mounted antimagnetic glass

3. Fix the dust screen inside the recess through the dog, can prevent debris such as dust from getting into the heat dissipation that influences smart electric meter through the louvre like this, temperature sensor detects smart electric meter inside temperature in real time simultaneously to start the fan and discharge the heat of smart electric meter inside, in order to reach radiating purpose.

4. The anti-ferromagnetic shell is arranged on the outer side of the wiring frame through the matching of the elastic protruding blocks and the fixing holes, so that the influence of the ferromagnetic on the wiring terminals can be avoided, and meanwhile, the provided identification frame is convenient for personnel to distinguish the corresponding wiring terminals.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a schematic diagram of a protection unit according to the present invention;

FIG. 3 is a schematic illustration of the magnetic coating structure of the present invention;

Fig. 4 is a schematic view of a partial enlarged structure of the present invention at a.

In the figure: 1 watchcase, 2 anti-interference units, 21 strong magnetic shielding cover, 22 rotating wheels, 23 screw rods, 24 regulating grooves, 25 clamping frames, 26 box covers, 27 wire frames, 28 placing boxes, 29 grounding wires, 210 conducting frames, 211 filters, 212 anti-magnetic glass, 3 radiating units, 31 racks, 32 fans, 33 radiating holes, 34 dustproof nets, 35 check blocks, 36 grooves, 37 temperature sensors, 4 protection units, 41 elastic convex blocks, 42 fixing holes, 43 strong magnetic shielding cases, 44 identification frames, 5 mounting grooves, 6 circuit board frames, 7 wiring frames, 8 wiring terminals, 9 shell covers, 10 sealing rings, 11 plug blocks, 12 wireless transmitters, 13 alarm lamps, 14 magnetic coatings and 15 controllers.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1-4, the present embodiment provides a technical solution: a smart electric meter for preventing strong magnetic interference comprises a watchcase 1 and an anti-interference unit 2;

watch case 1: the inside is provided with a mounting groove 5, the rear side of the mounting groove 5 is fixed with a circuit board frame 6, the inside of a watch case 1 is provided with a wiring frame 7, the inside of the wiring frame 7 is fixed with a wiring terminal 8, the front side of the watch case 1 is matched with the rear side of a case cover 9, the inside of the mounting groove 5 is provided with a radiating unit 3, the radiating unit 3 comprises a rack 31, a fan 32, a radiating hole 33, a dustproof net 34, a check block 35 and a groove 36, the rack 31 is provided with two fans 32 and is respectively fixed on the left side surface and the right side surface of the mounting groove 5, the fan 32 is placed in the rack 31, the radiating hole 33 is arranged on the rear side surface of the mounting groove 5, the groove 36 is arranged on the rear side surface of the watch case 1, the inside of the groove 36 is rotationally connected with the check block 35, the check block 35 is clamped with a through hole on the surface of the dustproof net 34, the input end of the fan 32 is electrically connected with the output end of a controller 15, the dustproof net 34 is fixed in the groove 36 by the rotation check block 35, so can prevent debris such as dust from entering through the louvre 33 and influencing the heat dissipation of smart electric meter, fan 32 then can discharge the inside heat of smart electric meter simultaneously, in order to reach radiating purpose, radiating element 3 contains still including temperature sensor 37, temperature sensor 37 installs the top at mounting groove 5 trailing flank, temperature sensor 37's output electricity connects the input of controller 15, temperature sensor 37 can real-time detect the inside temperature of smart electric meter, in order to prevent that the high temperature from causing the circuit board to damage, the outside of wiring frame 7 is equipped with protection element 4, protection element 4 contains elasticity lug 41, fixed orifices 42, prevent strong magnetic shell 43 and sign frame 44, elasticity lug 41 has two and fixes respectively in the left and right sides face of wiring frame 7, the fixed orifices 42 with the corresponding joint of elasticity lug 41 have all been seted up to the left and right sides face of strong magnetic shell 43, the identification frames 44 are uniformly distributed on the front side surface of the strong magnetic prevention shell 43, the strong magnetic prevention shell 43 is arranged on the outer side of the wiring frame 7, and the elastic protruding blocks 41 are matched with the fixing holes 42 to fix, so that the influence of strong magnetism on the wiring terminals 8 can be solved, and meanwhile, the identification frames 44 are convenient for personnel to distinguish the corresponding wiring terminals 8;

Interference rejection unit 2: the anti-interference unit 2 comprises a strong magnetic shielding cover 21, a rotating wheel 22, a screw 23, an adjusting groove 24 and a clamping frame 25, wherein the strong magnetic shielding cover 21 is spliced with the inside of a mounting groove 5, the top surface of the strong magnetic shielding cover 21 is provided with the clamping groove, the adjusting groove 24 is arranged on the rear side surface of the mounting groove 5, the screw 23 is rotationally connected in the adjusting groove 24, the rotating wheel 22 is arranged on the top surface of a watchcase 1, the bottom end of the rotating wheel 22 is connected with the top end of the screw 23, the screw 23 is in threaded connection with a screw hole on the surface of the clamping frame 25, the clamping frame 25 slides in the adjusting groove 24, the anti-interference unit 2 further comprises a box cover 26, a wire frame 27, a placement box 28, a grounding wire 29 and a conductive frame 210, the placement box 28 is fixed on the left side surface of the watchcase 1, the left side surface of the placement box 28 is slidingly connected with the box cover 26, the grounding wire 29 is fixed in the placement box 28, the conductive frame 210 is arranged at the outer side end of the grounding wire 29, the grounding wire 29 wound on the wire frame 27 is taken out to be of a proper length, the conductive frame 210 is fixed on the ground to guide electromagnetic waves into the ground, the influence of magnetism on equipment is reduced, the anti-interference unit 2 further comprises a filter 211 and anti-magnetic glass 212, the filter 211 is fixed on the rear side surface of the mounting groove 5, the anti-magnetic glass 212 is arranged on the front side surface of the shell cover 9, the input end of the filter 211 is electrically connected with the output end of the controller 15, the filter 211 is connected with the circuit board, electromagnetic interference signals can be blocked or weakened on a specific frequency band, and the influence of a magnetic field on a display and electronic elements on the circuit board can be reduced by matching the anti-magnetic glass 212;

Wherein: the intelligent ammeter comprises a shell cover 9, a controller 15, an external power supply, a sealing ring 10, an inserting block 11, an inserting groove, an inserting block 11 and an inserting groove, wherein the input end of the controller 15 is electrically connected with the output end of the external power supply, the connecting terminal 8 is inserted into the connecting frame 7, a circuit board can be connected with external equipment, a strong magnetic shielding cover 21 is inserted into the installing groove 5, a rotating wheel 22 enables a clamping frame 25 to be clamped into the clamping groove to fix the strong magnetic shielding cover 21, the strong magnetic shielding cover 21 can effectively isolate external strong magnetism, the intelligent ammeter is ensured to be normally used, the inserting block 11 is fixed at two ends of the front side of the sealing ring 10, the inserting block 11 is inserted into the inserting groove of the rear side of the shell cover 9, the sealing ring 10 is fixed by inserting block 11 and the inserting groove, and thus the damage of the intelligent ammeter caused by the liquid entering from a gap at the connecting position can be prevented, still include wireless transmitter 12, wireless transmitter 12 fixes the top surface at watchcase 1, wireless transmitter 12's output electricity connection director 15's input, wireless transmitter 12 can be with the real-time transmission of smart electric meter detected data for personnel's electronic equipment on, make things convenient for personnel long-range to look over like this, still include warning light 13, warning light 13 has two and fixes respectively in watchcase 1's left and right sides face, warning light 13's input electricity connection director 15's output, warning light 13 can light when smart electric meter breaks down, make things convenient for personnel to discern like this, still include magnetic coating 14, magnetic coating 14 evenly coats the surface at watchcase 1 and cap 9, magnetic coating 14 is epoxy, the magnetic coating 14 of coating can effectually play isolated effect to external magnetism, in order to improve smart electric meter's anti-ferromagnetic interference nature.

The working principle of the intelligent ammeter capable of preventing strong magnetic interference provided by the invention is as follows: firstly, the dustproof net 34 is installed in the groove 36, the dustproof net 34 is fixed by the rotation stop block 35, then the circuit board is installed on the front side surface of the circuit board frame 6 after the watch case 1 is installed at a proper position, then the wiring terminal 8 is inserted into the wiring frame 7, the circuit board is connected with external equipment through the wiring terminal 8, the anti-ferromagnetic shell 43 is installed on the outer side of the wiring frame 7, the elastic lug 41 is matched with the fixing hole 42 to fix, thus the influence of the ferromagnetic on the wiring terminal 8 can be solved, meanwhile, the corresponding wiring terminal 8 is conveniently distinguished by personnel by the identification frame 44, then the ferromagnetic shielding cover 21 is inserted into the installation groove 5, the clamping frame 25 is clamped into the clamping groove to fix the ferromagnetic shielding cover 21 by the rotation wheel 22, the ferromagnetic shielding cover 21 can effectively isolate external ferromagnetic to ensure the normal use of the intelligent ammeter, meanwhile, the filter 211 is connected with the circuit board, so that electromagnetic interference signals can be blocked or weakened on a specific frequency band, the influence of a magnetic field on a display and electronic elements on the circuit board can be reduced by matching with the mounted antimagnetic glass 212, then the grounding wire 29 wound on the wire frame 27 is taken out to a proper length, the conductive frame 210 is fixed on the ground to guide the electromagnetic waves into the ground, the influence of magnetism on equipment is reduced, the temperature sensor 37 can be arranged to start the fan 32 when the internal temperature of the smart meter exceeds a preset range, the fan 32 can discharge heat in the smart meter so as to achieve the purpose of heat dissipation, the dust screen 34 can prevent sundries such as dust from entering through the heat dissipation holes 33 to influence the heat dissipation of the smart meter, and the wireless transmitter 12 can transmit data detected by the smart meter to electronic equipment of personnel in real time, thus, the magnetic coating 14 coated on the surfaces of the watch case 1 and the shell cover 9 can effectively isolate external magnetism so as to improve the anti-strong magnetic interference performance of the intelligent ammeter.

It should be noted that, in the above embodiment, the controller 15 is selected from the models S7-200, the filter 211 can be freely configured according to the practical application, the filters of the models DAA1-3A are recommended, the temperature sensor 37 is selected from the models AS5600, and the wireless transmitter 12 is selected from the models WJL-207. The controller 15 controls the operation of the filter 211, the fan 32, the temperature sensor 37, the wireless transmitter 12 and the warning light 13 using methods commonly used in the art.

The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.

Claims

1. Prevent strong magnetic interference's smart electric meter, its characterized in that: comprises a watchcase (1) and an anti-interference unit (2);

Watch case (1): the novel meter socket is characterized in that an installation groove (5) is formed in the meter socket, a circuit board frame (6) is fixed on the rear side of the installation groove (5), a wiring frame (7) is arranged in the meter case (1), a wiring terminal (8) is fixed in the wiring frame (7), the front side surface of the meter case (1) is matched with the rear side surface of a case cover (9), a heat radiating unit (3) is arranged in the installation groove (5), and a protection unit (4) is arranged on the outer side of the wiring frame (7);

Anti-interference unit (2): the novel watch comprises a strong magnetic shielding cover (21), a rotating wheel (22), a screw rod (23), an adjusting groove (24) and a clamping frame (25), wherein the strong magnetic shielding cover (21) is spliced with the inside of a mounting groove (5), the clamping groove is formed in the top surface of the strong magnetic shielding cover (21), the adjusting groove (24) is formed in the rear side surface of the mounting groove (5), the screw rod (23) is rotationally connected to the inside of the adjusting groove (24), the rotating wheel (22) is arranged on the top surface of a watch case (1), the bottom end of the rotating wheel (22) is connected with the top end of the screw rod (23), the screw rod (23) is in threaded connection with a screw hole on the surface of the clamping frame (25), and the clamping frame (25) slides in the adjusting groove (24).

Wherein: the device further comprises a controller (15), wherein the controller (15) is arranged on the front side surface of the shell cover (9), and the input end of the controller (15) is electrically connected with the output end of an external power supply.

2. The smart meter of claim 1, wherein: the anti-interference unit (2) further comprises a box cover (26), a wire frame (27), a placement box (28), a grounding wire (29) and a conductive frame (210), wherein the placement box (28) is fixed on the left side face of the watch case (1), the box cover (26) is slidably connected to the left side face of the placement box (28), the grounding wire (29) is fixed inside the placement box (28), and the conductive frame (210) is installed at the outer side end of the grounding wire (29).

3. The smart meter of claim 1, wherein: the anti-interference unit (2) further comprises a filter (211) and anti-magnetic glass (212), the filter (211) is fixed on the rear side face of the mounting groove (5), the anti-magnetic glass (212) is mounted on the front side face of the shell cover (9), and the input end of the filter (211) is electrically connected with the output end of the controller (15).

4. The smart meter of claim 1, wherein: the utility model discloses a radiating unit, including radiating unit (3), including frame (31), fan (32), louvre (33), dust screen (34), dog (35) and recess (36), frame (31) have two and fix respectively the left and right sides face at mounting groove (5), fan (32) have been placed to the inside of frame (31), the trailing flank at mounting groove (5) has been seted up in louvre (33), the trailing flank at watchcase (1) is seted up in recess (36), the inside rotation of recess (36) is connected with dog (35), the through-hole looks joint on dog (35) and dust screen (34) surface, the output of controller (15) is connected to the input electricity of fan (32).

5. The smart meter of claim 1, wherein: the protection unit (4) comprises elastic protruding blocks (41), fixing holes (42), anti-strong magnetic shells (43) and identification frames (44), wherein the elastic protruding blocks (41) are two and are respectively fixed on the left side surface and the right side surface of the wiring frame (7), the fixing holes (42) which are correspondingly clamped with the elastic protruding blocks (41) are formed in the left side surface and the right side surface of the anti-strong magnetic shells (43), and the identification frames (44) are uniformly distributed on the front side surface of the anti-strong magnetic shells (43).

6. The smart meter of claim 1, wherein: the heat dissipation unit (3) comprises a temperature sensor (37), the temperature sensor (37) is arranged at the top end of the rear side surface of the mounting groove (5), and the output end of the temperature sensor (37) is electrically connected with the input end of the controller (15).

7. The smart meter of claim 1, wherein: the sealing device is characterized by further comprising a sealing ring (10) and an inserting block (11), wherein the inserting blocks (11) are fixed at two ends of the front side face of the sealing ring (10), and the inserting blocks (11) are inserted into slots on the rear side face of the shell cover (9).

8. The smart meter of claim 1, wherein: the watch case also comprises a wireless transmitter (12), wherein the wireless transmitter (12) is fixed on the top surface of the watch case (1), and the output end of the wireless transmitter (12) is electrically connected with the input end of the controller (15).

9. The smart meter of claim 1, wherein: the alarm lamp (13) is arranged, two alarm lamps (13) are respectively fixed on the left side surface and the right side surface of the watch case (1), and the input end of the alarm lamp (13) is electrically connected with the output end of the controller (15).

10. The smart meter of claim 1, wherein: the novel watch case is characterized by further comprising a magnetic coating (14), wherein the magnetic coating (14) is uniformly coated on the surfaces of the watch case (1) and the shell cover (9), and the magnetic coating (14) is epoxy resin.