A DC smart energy meter

Abstract

The present application discloses a DC smart energy meter, which relates to the technical field of smart meters, including a shell, a front cover, an observation window, an external wire and an anti-pull mechanism, wherein a prompt mechanism is fixed at the bottom of the shell; the prompt mechanism includes a wire pulling box, a pad, a sealing sleeve and a fixing part; the wire pulling box is fixed at the bottom of the shell, and a plurality of cavities are arranged inside the wire pulling box for packaging external wires at different positions; a plurality of wire outlets are evenly opened at the bottom of the wire pulling box; a plurality of fixing parts are arranged, all of which are fixed in the middle of the corresponding cavities, and the fixing part has a vertically arranged elastic pull shell, which is connected to the inside of the wire pulling box in a detachable manner, and is used to be pulled out of the wire outlet during the pulling process to remind the staff that the pulling length is too long; the technical effect of reminding the wiring personnel of the amount of wire used during the wiring process, avoiding equipment damage, improving the anti-pull effect and service life of the external wire, and improving personal safety can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of smart electric meters, and in particular to a direct current smart electric energy meter. Background Art

[0002] Smart meters are electric energy metering devices with intelligent functions. They are widely used to replace traditional electric energy meters and aim to provide more data and functions for more efficient management of electricity usage.

[0003] The Chinese invention patent with patent number CN114487526B discloses a DC smart energy meter, including a shell, a terminal installed in the shell and connected to a circuit board through a wire; an anti-pull mechanism is installed in the shell below the terminal, and the terminal is connected to an external wire that passes through the anti-pull mechanism and is connected to the shell from the outside; the invention is provided with an anti-pull mechanism below the terminal, the anti-pull mechanism includes a bar block, a plurality of groups of winding rollers symmetrically distributed up and down, a sliding block connected to the winding roller, a spring arranged between the sliding blocks, and a guide bolt passing through the sliding block, so that when the external wire is pulled, the winding rollers are close to each other to buffer the pulling of the external wire, and when the external wire is subjected to a large force, the winding rollers are completely pulled into contact, at which time the winding rollers squeeze and lock the external wire, thereby improving the anti-pull ability and maintaining the contact between the external wire and the terminal, and having a good anti-pull effect.

[0004] Although the above scheme is relatively convenient to operate and can reduce the probability of excessive pulling of the external wires and causing damage to the electric energy meter to a certain extent during the wiring process, since the external wires are pulled manually, the above scheme cannot remind the wiring personnel of the specific pulling length. After the external wires are locked, the wiring personnel may continue to pull them, resulting in excessive pulling and wire breakage, short circuit and other faults, causing unnecessary maintenance and replacement costs, reducing the anti-pulling effect and the service life of the external wires and equipment, which is not conducive to daily life or teaching needs, and poses a certain threat to personal safety. Summary of the invention

[0005] The present application provides a DC smart electricity meter to solve the technical problems in the prior art that the wiring personnel cannot be reminded of the amount of wire used, which leads to damage to the equipment, reduces the anti-pull effect and service life of the external wire, is not conducive to daily life or teaching needs, and poses a certain threat to personal safety. The application achieves the technical effect of being able to remind the wiring personnel of the amount of wire used during the wiring process to avoid damage to the equipment, further improves the anti-pull effect and service life of the external wire, is conducive to daily life or teaching needs, and improves personal safety.

[0006] The present application provides a DC smart energy meter, comprising a housing, a front cover, an observation window, an external wire, and an anti-pull mechanism for squeezing and locking the external wire, wherein a prompt mechanism is fixed to the bottom of the housing;

[0007] The prompt mechanism includes a wire pulling box, a backing plate, a sealing sleeve and a fixing part;

[0008] The external wire passes through the sealing sleeve, the backing plate, the wire box and the fixing part in sequence from top to bottom;

[0009] The wire pulling box is fixed to the bottom of the housing, and has a plurality of cavities inside thereof for packaging external wires at different positions;

[0010] The bottom of the wire pulling box is evenly provided with a plurality of wire outlets corresponding to the cavities, for providing an outlet for pulling and wiring external wires;

[0011] The pads are provided in plurality and are evenly fixed above the wire pulling box and correspond to the cavities one by one, so as to play a buffering role when the staff pulls out the external wires with excessive force;

[0012] The sealing sleeves are provided in plurality and fixed one by one in the middle of the upper part of the pad, and are used to protect the bending position of the external wires and prevent the external wires from breaking;

[0013] There are multiple fixing parts, all of which are fixed one by one in the middle of the corresponding cavity. The fixing part has a vertically arranged elastic pulling shell, which is connected to the inside of the wire pulling box in a detachable manner, and is used to be pulled out of the wire outlet during the pulling process to remind the staff that the pulling length is too long.

[0014] Furthermore, the fixing part includes a connecting plate, a fixing block and an elastic pull shell;

[0015] The connecting plate is fixed to the front side of the corresponding cavity and a through slot is provided on the top thereof, and the external wire slides inside the through slot;

[0016] The fixing block is fixed on the connecting plate and is located inside the through slot, and is used to fix the pulling position of the external wire and the elastic pull shell;

[0017] The elastic pull shell is fixed on the fixed block and is used to be pulled out of the wire outlet along with the external wire during the pulling process, so as to remind the staff that the pulling length is too long.

[0018] Furthermore, the elastic pull shell is a flexible long strip structure, made of rubber material, and a non-slip layer is provided on the side in contact with the external wire.

[0019] Furthermore, an alarm mechanism is fixed inside each of the cavities; the alarm mechanism includes a position plate, an elastic ball, a telescopic column, a contact sheet and a sensor;

[0020] The position plate is fixed to the rear side of the corresponding cavity and is located below the connecting plate. A placement groove is provided in the middle of the upper surface of the position plate for accommodating the elastic ball, telescopic column, contact sheet and sensor.

[0021] The fixed end of the telescopic column is slidably connected to the inside of the placement slot, and a spring is sleeved on the outside of the telescopic column. One end of the spring is fixed to the fixed end of the telescopic column, and the other end is fixed to the elastic ball, which is used to push the contact piece to contact the sensor under the action of the elastic shell;

[0022] The contact piece is fixed to the fixed end of the telescopic column and is used to move in contact with the sensor so that the sensor sends out an alarm;

[0023] The elastic ball is fixed to the telescopic end of the telescopic column and is used to cooperate with the elastic pull shell. Under the action of the elastic pull shell, the telescopic column and the contact piece are driven to move, so that the contact piece contacts the sensor;

[0024] The sensor is fixed in the placement slot and is used to cooperate with the contact piece to provide voice prompts to the staff.

[0025] Furthermore, the elastic pull shell has two layers, which are divided into a display layer and a hidden layer;

[0026] The display layer and the hidden layer are both fixed on the fixed block; the display layer and the hidden layer are arranged front and back;

[0027] The bottom of the display layer is provided with an air bag, which is used to expand after the display layer is pulled out of the outlet to provide a warning to personnel and protect the electric energy meter and external wiring;

[0028] The hidden layer is coated on the outside of the external wire and is used to hide the external wire when it is pulled to a straightened state.

[0029] Furthermore, the airbag is connected to an air pump through a pipeline, and the air pump controls the inflation amount of the airbag horizontally expanding according to the contact time between the contact piece and the sensor. The horizontal expansion distance of the airbag is 2 to 4 times the diameter of the airbag before expansion.

[0030] Furthermore, a text prompt is printed on the outer surface of the inflated airbag.

[0031] Furthermore, the vertically extended length of the display layer is 1.5 to 3 times the vertically extended length of the hidden layer.

[0032] Furthermore, a dummy external wire is fixed between the display layer and the hidden layer. When the external wire is excessively pulled manually, the display layer and the hidden layer are separated and naturally fall off, so as to prevent malicious pulling and protect the real external wire.

[0033] Furthermore, the hidden layer is reversely highlighted when being pulled to be almost straightened, pushing the external wire and retracting the external wire into the cavity to hide the external wire; the display layer is separated from the display layer when being pulled to be almost straightened, and falls to the wire outlet along with the dummy external wire.

[0034] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0035] By manually pulling the external wire, the elastic pull shell is pulled out along with the external wire, so that the wiring personnel can quickly determine the length limit of the external wire pulling out according to the length of the elastic pull shell pulled out of the wire outlet while pulling the external wire. This can timely and effectively solve the technical problems in the prior art that the wiring personnel cannot be reminded of the amount of wire used, resulting in equipment damage, reducing the anti-pull effect and service life of the external wire, being not conducive to daily life or teaching needs, and posing a certain threat to personal safety. This achieves the technical effect of being able to remind the wiring personnel of the amount of wire used during the wiring process to avoid equipment damage, further improving the anti-pull effect and service life of the external wire, being conducive to daily life or teaching needs, and improving personal safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The present invention is a three-dimensional structural diagram of a DC smart electric energy meter.

[0037] Figure 2 The present invention is a three-dimensional structural diagram of a prompt mechanism of a DC smart electric energy meter.

[0038] Figure 3 This is a state diagram of the elastic pull shell and external wires of a DC smart electric energy meter before being pulled.

[0039] Figure 4 The present invention is a partial side cross-sectional view of an elastic pull shell and an external wire of a DC smart electric energy meter before being pulled.

[0040] Figure 5 This is a state diagram of an elastic pull shell and an external wire of a DC smart electric energy meter after being pulled.

[0041] Figure 6 This is a partial enlarged view of point A of a DC smart electric energy meter of the present invention.

[0042] Figure 7 It is a partial cross-sectional side view of an elastic pull shell and an external wire of a DC smart electric energy meter before and after being pulled.

[0043] In the figure: 100, shell; 110, front cover; 120, observation window; 130, anti-pull mechanism; 170, airbag; 200, external connection; 210, dummy external connection; 300, prompt mechanism; 310, wire pulling box; 311, cavity; 312, wire outlet; 320, pad; 330, sealing sleeve; 340, connecting plate; 341, through groove; 350, fixing block; 360, elastic pull shell; 361, display layer; 362, hidden layer; 410, position plate; 411, placement groove; 420, elastic ball; 430, telescopic column; 440, contact piece; 450, sensor. DETAILED DESCRIPTION

[0044] To facilitate the understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0045] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are only for illustrative purposes and do not represent the only implementation method.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0047] See also Figure 1 , is a schematic diagram of the three-dimensional structure of a DC smart electric energy meter of the present invention; Figure 2 As shown, the present application optimizes and improves the structure of the outlet terminal of the shell 100 in the prior art, and sets a prompt mechanism 300 to manually pull the external wire 200 to drive the elastic pull shell 360, and the elastic pull shell 360 is pulled out along with the external wire 200, so that the wiring personnel can quickly determine the length limit of the external wire 200 according to the length of the elastic pull shell 360 pulled out of the wire outlet 312 while pulling the external wire 200, so as to realize the technical effect that the wiring personnel can be reminded of the amount of wire used during the wiring process to avoid equipment damage, further improve the anti-pulling effect and service life of the external wire 200, and is beneficial to daily life or teaching needs and improves personal safety.

[0048] Embodiment 1: Figure 1 and Figure 2As shown, the present application is a DC smart energy meter, comprising a housing 100, a front cover 110, an observation window 120, an external wire 200 and an anti-pull mechanism 130 for squeezing and locking the external wire 200, and a prompt mechanism 300 is fixed at the bottom of the housing 100;

[0049] The prompt mechanism 300 includes a wire pulling box 310, a backing plate 320, a sealing sleeve 330 and a fixing part;

[0050] The external wire 200 passes through the sealing sleeve 330, the backing plate 320, the wire box 310 and the fixing part from top to bottom in sequence;

[0051] The wire pulling box 310 is fixed to the bottom of the housing 100, and is provided with a plurality of cavities 311 therein for packaging external wires 200 at different positions;

[0052] The bottom of the wire pulling box 310 is evenly provided with a plurality of wire outlets 312 corresponding to the cavities 311, for providing an outlet for pulling the external wire 200;

[0053] The pads 320 are provided in plurality and are evenly fixed above the wire pulling box 310 and correspond one to one with the cavities 311, and are used to buffer the staff when they pull out the external wire 200 with excessive force;

[0054] The sealing sleeve 330 is provided in plurality and fixed one by one at the middle part above the pad 320 to protect the bending position of the external wire 200 and prevent the external wire 200 from breaking;

[0055] There are multiple fixing parts, all fixed one by one in the middle of the corresponding cavity 311. The fixing part has a vertically arranged elastic pull shell 360, which is connected to the inside of the wire pulling box 310 in a detachable manner, and is used to be pulled out of the wire outlet 312 during the pulling process to remind the staff that the pulling length is too long.

[0056] like Figure 2 , Figure 3 and Figure 6 As shown, the fixing portion includes a connecting plate 340, a fixing block 350 and an elastic pull shell 360;

[0057] The connecting plate 340 is fixed to the front side of the corresponding cavity 311 and a through slot 341 is formed on the top thereof, and the external wire 200 slides inside the through slot 341;

[0058] The fixing block 350 is fixed on the connecting plate 340 and is located inside the through slot 341 , and is used to fix the pulling position of the external wire 200 and the elastic pull shell 360 ;

[0059] The elastic pull shell 360 is fixed on the fixed block 350, and is used to be pulled out of the outlet 312 along with the external wire 200 during the pulling process, so as to remind the staff that the pulling length is too long; it is convenient for maintenance personnel to inspect, replace or maintain the electric energy meter, save maintenance time and improve maintenance efficiency; if a fault occurs, the elastic pull shell 360 can be pulled out along with the external wire 200, so that the fault point can be found more quickly, the time for fault detection and repair can be shortened, and the production interruption time can be reduced. At the same time, it can also improve safety, facilitate maintenance, reduce misoperation, increase transparency and quickly detect faults.

[0060] Furthermore, in order to ensure that the external cable 200 can stably drive the elastic pull shell 360 to move when being pulled to a certain extent, as shown in FIG. Figure 3 As shown, the elastic pull shell 360 is a flexible long strip structure, made of rubber material, and a non-slip layer is provided on the side in contact with the external wire 200 .

[0061] During actual operation of the embodiment of the present application, the steps are as follows: the staff manually pulls the external wire 200 downward gradually. Before pulling it out, a margin is left for the length of the external wire 200 below the fixed block 350 (inside the cavity 311). As the staff gradually pulls it out, when the external wire 200 is pulled to a certain length, the elastic pull shell 360 moves downward with the external wire 200 and is pulled out of the wire outlet 312. At this time, the wiring personnel can realize that the wire is too long by observation and touch, and thus remind the staff, so that the present invention can more intuitively and conveniently effectively prevent being pulled and causing line damage.

[0062] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0063] The present invention solves the technical problems in the prior art that the wiring personnel cannot be reminded of the amount of wire used, which causes damage to the equipment, reduces the anti-pull effect and service life of the external cable 200, is not conducive to daily life or teaching needs, and poses a certain threat to personal safety. The present invention realizes the technical effect that the wiring personnel can be reminded of the amount of wire used during the wiring process to avoid damage to the equipment, further improves the anti-pull effect and service life of the external cable 200, is conducive to daily life or teaching needs, and improves personal safety.

[0064] Embodiment 2: In order to further improve the wiring awareness of the wiring personnel and adapt to the environment in which the vision is blurred or at night to improve the applicability of the present invention, the present application proposes the following technical solutions to improve the reminder effect, specifically:

[0065] like Figure 3 and Figure 4As shown, an alarm mechanism is fixed inside each cavity 311; the alarm mechanism includes a position plate 410, an elastic ball 420, a telescopic column 430, a contact sheet 440 and a sensor 450;

[0066] The position plate 410 is fixed to the rear side of the corresponding cavity 311 and is located below the connecting plate 340. A placement groove 411 is provided in the middle of the upper surface of the position plate 410 for accommodating the elastic ball 420, the telescopic column 430, the contact sheet 440 and the sensor 450.

[0067] The fixed end of the telescopic column 430 is slidably connected to the inside of the placement groove 411, and a spring is sleeved on the outer side of the telescopic column 430, one end of the spring is fixed to the fixed end of the telescopic column 430, and the other end is fixed to the elastic ball 420, which is used to push the contact piece 440 to contact the sensor 450 under the action of the elastic pull shell 360;

[0068] The contact piece 440 is fixed to the fixed end of the telescopic column 430 and is used to move in contact with the sensor 450 so that the sensor 450 sends out an alarm;

[0069] The elastic ball 420 is fixed to the telescopic end of the telescopic column 430 and is used to cooperate with the elastic pull shell 360. Under the action of the elastic pull shell 360, the telescopic column 430 and the contact piece 440 are driven to move, so that the contact piece 440 contacts the sensor 450.

[0070] The sensor 450 is fixed in the placement groove 411 and is used to cooperate with the contact piece 440 to provide voice prompts to the staff.

[0071] The sensor 450 is a contact sensor, which is used to emit a warning sound to remind the staff, and is preferably a DC power supply or a battery. It is a prior art and will not be described in detail here.

[0072] By setting an alarm whistle-type sensor 450 in the direction in which the elastic pull shell 360 follows the pulling and deformation of the external cable 200, the elastic pull shell 360 is deformed and gradually straightened by manually pulling the external cable 200, and the elastic ball 420 is pushed to move in the direction close to the position plate 410, the spring and the telescopic column 430 are compressed, and the telescopic column 430 moves synchronously and drives the contact piece 440 to contact the sensor 450, so as to realize a pull-and-sound alarm reminder, and can provide an obvious sound alarm to remind people to pay attention to or warn people of potential dangers of the external cable 200; in an emergency, the sound of the sensor 450 can quickly attract people's attention, so that maintenance personnel can locate the problem more quickly, improve maintenance efficiency, and reduce maintenance costs.

[0073] Embodiment 3: Since in daily life, electric energy meters are usually installed outdoors, in order to prevent the impact of harsh external environment on the electric energy meters, and to further improve the safety awareness of the staff, and to better prevent damage to the electric energy meters and threats to personal safety due to excessive pulling, the present application proposes the following technical solutions for the above technical problems, specifically:

[0074] like Figure 3-Figure 6 As shown, the elastic pull shell 360 has two layers, which are divided into a display layer 361 and a hidden layer 362;

[0075] The display layer 361 and the hidden layer 362 are both fixed on the fixing block 350 ; the display layer 361 and the hidden layer 362 are arranged front and back and the hidden layer 362 is in contact with the external wire 200 ;

[0076] The bottom of the display layer 361 is provided with an air bag 170, which is used to expand after the display layer 361 is pulled out of the outlet 312 to provide a warning to the personnel and protect the electric energy meter and the external wire 200;

[0077] The hidden layer 362 is coated on the outside of the external wire 200 and is used to hide the external wire 200 when it is pulled to a straightened state.

[0078] The airbag 170 is connected to the air pump through a pipeline, and the air pump controls the inflation amount of the airbag 170 according to the contact time between the contact piece 440 and the sensor 450. The horizontal expansion distance of the airbag 170 is 2 to 4 times the diameter of the airbag 170 before expansion.

[0079] The outer surface of the inflated airbag 170 is printed with text prompts, and the printed text can be printed according to different requirements. Here, Figure 5 When the airbag 170 is inflated, no specific prompt statement is shown in the figure.

[0080] The air pump is used to provide air to inflate the airbag 170 and expand it. It is connected to the sensor 450 through a controller and a pipeline, and is preferably a programmable logic controller. The sensor 450 can not only serve as an alarm reminder but also monitor the operating status of the air pump or control the start and stop of the air pump. This is existing technology and will not be described in detail here.

[0081] By arranging an airbag 170 at the bottom of the elastic pull shell 360, the airbag 170 has a cylindrical structure when fully expanded and has warning words on the outside, which can cooperate with the sensor 450, and inflate the inside of the airbag 170 through an external pipeline, so that the airbag 170 is fully expanded at the outlet 312, which can not only quickly attract the attention of the staff, but also serve as a warning to the personnel, reminding the operator to pay attention to the need for careful actions during the disassembly process, reduce the risk of misoperation, and avoid accidents. At the same time, it can also provide additional buffer protection when unplugging the external wiring 200 of the electricity meter, reduce damage to the external wiring 200 and the connector, and extend the service life of the equipment.

[0082] Providing the airbag 170 can also effectively reduce the shock and vibration when the external cable 200 is connected, ensure the stability and reliability of the connection, avoid the electric energy meter data errors caused by poor connection, reduce the damage and misoperation of the external cable 200, reduce the cost of maintenance and repair, and extend the service life of the equipment.

[0083] Embodiment 4: In order to further protect the external wire 200, improve the service life of the electric energy meter, and prevent malicious pulling from causing leakage and endangering personal safety, the present application proposes the following technical solutions for the above technical problems, specifically:

[0084] like Figure 4-Figure 7 As shown, the vertically stretched length of the display layer 361 is 1.5 to 3 times the vertically stretched length of the hidden layer 362, and the display layer 361 and the hidden layer 362 are in a state of being in contact with each other on two opposite surfaces before being pulled.

[0085] A dummy external wire 210 is fixed between the display layer 361 and the hidden layer 362. When the external wire 200 is excessively pulled by an artificial person, the display layer 361 and the hidden layer 362 are separated and then fall naturally, so as to prevent malicious pulling and protect the real external wire 200. The upper end of the dummy external wire 210 is fixed between the display layer 361 and the hidden layer 362 by a strong adhesive, and the lower end is fixed between the display layer 361 and the hidden layer 362 by a weak adhesive. When the external wire 200 is excessively pulled by an artificial person, the tension between the display layer 361 and the hidden layer 362 increases, exceeding the bearing limit of the connection point of the weak adhesive at the lower end of the dummy external wire 210, resulting in the connection point at the lower end being broken. At this time, the lower end of the dummy external wire 210 is disconnected from the display layer 361 and the hidden layer 362, so the lower end of the dummy external wire 210 will naturally fall from the outlet 312 under the action of gravity.

[0086] The hidden layer 362 is reversely highlighted when being pulled to a state where it is almost straightened, pushing the external wire 200 and retracting the external wire 200 into the cavity 311 to hide the external wire 200; the display layer 361 is separated from the display layer 361 when being pulled to a state where it is almost straightened, and falls to the wire outlet 312 along with the dummy external wire 210.

[0087] By setting the elastic pulling shell 360 into two layers, a fake dummy external wire 210 is set between the display layer 361 and the hidden layer 362. After the external wire 200 is pulled to a certain extent, the hidden layer 362 can be recessed in the opposite direction toward the external wire 200, so as to protect the real external wire 200 inside the cavity 311. After the dummy external wire 210 is hidden by the real external wire 200, the tension between the display layer 361 and the hidden layer 362 increases, so that the connection point at the lower end of the dummy external wire 210 is broken. Therefore, the lower end of the dummy external wire 210 will naturally fall from the wire outlet 312 under the action of gravity, which plays a confusing role, and can effectively prevent malicious pulling, thereby protecting the real external wire 200 and the electric energy meter equipment.

[0088] Setting up a dummy external line 210 can, to a certain extent, reduce the risk of equipment damage caused by incorrect operation or incorrect wiring, extend the life of the equipment, and save maintenance costs; it can also prevent the outside world from mistaking it for a valid external line 200 and operating it, reduce the occurrence of accidents, and protect the safety of equipment and personnel; it can reduce the possibility of untaught or untrained personnel directly contacting the external line 200, reduce the risk of electric shock, and enhance safety.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A DC smart energy meter, comprising a housing (100), a front cover (110), an observation window (120), an external wire (200), and an anti-pull mechanism (130) for squeezing and locking the external wire (200), characterized in that: A prompting mechanism (300) is fixed to the bottom of the housing (100); The prompt mechanism (300) comprises a wire pulling box (310), a backing plate (320), a sealing sleeve (330) and a fixing part; The external wire (200) passes through the sealing sleeve (330), the backing plate (320), the wire pulling box (310) and the fixing part in sequence from top to bottom; The wire pulling box (310) is fixed to the bottom of the housing (100), and is provided with a plurality of cavities (311) therein for packaging external wires (200) at different positions; The bottom of the wire pulling box (310) is evenly provided with a plurality of wire outlets (312) corresponding to the cavities (311) one by one, and used to provide an outlet for pulling and wiring the external wires (200); A plurality of pads (320) are provided, evenly fixed above the wire pulling box (310) and corresponding one to one with the cavities (311), and are used to provide a buffer when a worker pulls out the external wire (200) with excessive force; A plurality of sealing sleeves (330) are provided, each of which is fixed in a one-to-one correspondence to the middle portion above the pad (320), and is used to protect the bending position of the external wire (200) to prevent the external wire (200) from breaking; The fixing parts are provided in plurality and are all fixed one by one in the middle of the corresponding cavities (311). The fixing parts are provided with a vertically arranged elastic pull shell (360) which is connected to the inside of the wire pulling box (310) in a detachable manner and is used to be pulled out of the wire outlet (312) during the pulling process to remind the staff that the pulling length is too long. The fixing part comprises a connecting plate (340), a fixing block (350) and an elastic pull shell (360); The connecting plate (340) is fixed on the front side of the corresponding cavity (311) and a through groove (341) is provided on the top thereof, and the external wire (200) slides inside the through groove (341); The fixing block (350) is fixed on the connecting plate (340) and is located inside the through slot (341), and is used to fix the pulling position of the external wire (200) and the elastic pull shell (360); The elastic pull shell (360) is fixed on the fixed block (350) and is used to be pulled out of the wire outlet (312) along with the external wire (200) during the pulling process, so as to remind the staff that the pulling length is too long; The elastic pull shell (360) is a flexible long strip structure made of rubber material, and a non-slip layer is provided on the side in contact with the external wire (200).

2. A DC smart energy meter as claimed in claim 1, characterized in that: An alarm mechanism is fixed inside each cavity (311); the alarm mechanism comprises a position plate (410), an elastic ball (420), a telescopic column (430), a contact sheet (440) and a sensor (450); The position plate (410) is fixed to the rear side of the corresponding cavity (311) and is located below the connecting plate (340). A placement groove (411) is provided in the middle of the upper surface of the position plate (410) for accommodating the elastic ball (420), the telescopic column (430), the contact sheet (440) and the sensor (450). The fixed end of the telescopic column (430) is slidably connected to the inside of the placement groove (411), and a spring is sleeved on the outside of the telescopic column (430), one end of the spring is fixed to the fixed end of the telescopic column (430), and the other end is fixed to the elastic ball (420), and is used to push the contact piece (440) to contact the sensor (450) under the action of the elastic pull shell (360); The contact piece (440) is fixed to the fixed end of the telescopic column (430) and is used to move in contact with the sensor (450) so that the sensor (450) issues an alarm; The elastic ball (420) is fixed to the telescopic end of the telescopic column (430) and is used to cooperate with the elastic pull shell (360). Under the action of the elastic pull shell (360), the telescopic column (430) and the contact piece (440) are driven to move, so that the contact piece (440) contacts the sensor (450); The sensor (450) is fixed in the placement slot (411) and is used to cooperate with the contact piece (440) to provide voice prompts to the staff.

3. A DC smart energy meter as claimed in claim 2, characterized in that: The elastic pull shell (360) has two layers, namely a display layer (361) and a hidden layer (362); The display layer (361) and the hidden layer (362) are both fixed on the fixed block (350); the display layer (361) and the hidden layer (362) are arranged front to back; The bottom of the display layer (361) is provided with an air bag (170), which is used to expand after the display layer (361) is pulled out of the outlet (312) to provide a prompt to personnel and protect the electric energy meter and the external wire (200); The hidden layer (362) is coated on the outside of the external wire (200) and is used to hide the external wire (200) when it is pulled to a straightened state.

4. A DC smart energy meter as claimed in claim 3, characterized in that: The airbag (170) is connected to an air pump through a pipeline, and the air pump controls the inflation amount of the airbag (170) for horizontal expansion according to the contact time between the contact piece (440) and the sensor (450). The distance of the horizontal expansion of the airbag (170) is 2 to 4 times the diameter of the airbag (170) before expansion.

5. A DC smart energy meter as claimed in claim 4, characterized in that: The outer surface of the inflated airbag (170) is printed with text prompts.

6. A DC smart energy meter as claimed in claim 3, characterized in that: The vertically stretched length of the display layer (361) is 1.5 to 3 times the vertically stretched length of the hidden layer (362), and the display layer (361) and the hidden layer (362) are in a state of two opposite surfaces being in contact with each other before being pulled.

7. A DC smart energy meter as claimed in claim 6, characterized in that: A dummy external wire (210) is fixed between the display layer (361) and the hidden layer (362). When the external wire (200) is excessively pulled manually, the display layer (361) and the hidden layer (362) are separated and then naturally fall off, thereby preventing malicious pulling and protecting the real external wire (200).

8. A DC smart energy meter as claimed in claim 7, characterized in that: The hidden layer (362) is reversely highlighted when pulled to a state where it is almost straightened, pushing the external wire (200) and causing the external wire (200) to be retracted into the cavity (311) to hide the external wire (200); the display layer (361) is separated from the display layer (361) when pulled to a state where it is almost straightened, and falls to the wire outlet (312) along with the dummy external wire (210).

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