Direct-current electric energy meter for charging pile

Abstract

The utility model discloses a direct current electric energy meter for a charging pile. The direct current electric energy meter comprises a measuring module, a measuring module protective cover, a signal acquisition module and a signal acquisition module protective cover. According to the direct current electric energy meter for the charging pile, the two installation modes of separate and independent installation and integrated installation of the signal acquisition module and the measurement module can be met at the same time, the research and development cost is reduced, the installation flexibility is improved, and the market competitiveness is improved; during integrated installation, a lead sealing signal acquisition module and a measurement module do not need to be independently used, and lead sealing of the whole machine can be completed only through the lead sealing measurement module, so that the construction difficulty is reduced; when maintenance and replacement are needed in integrated installation, the measurement module can be maintained or replaced without power off and using tools, efficient operation can be performed under the condition of compact installation, the after-sales efficiency is greatly improved, and the after-sales difficulty and the after-sales cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of DC energy meters, in particular to a DC energy meter for charging piles. Background Art

[0002] The DC energy meter for charging piles consists of a signal acquisition module and a measurement module. According to actual installation requirements, different types of charging piles will adopt different installation methods. One is that the signal acquisition module and the measurement module are installed separately and independently, and are connected by signal connection lines; the other is that the signal acquisition module and the measurement module are integrated for installation to save installation space. This installation method is applicable to the situation where the internal installation space of small charging piles is insufficient. Different installation methods require the development of two different structural forms of DC energy meters. When the signal acquisition module and the measurement module are integrally installed in a small charging pile, the DC energy meter needs to be disassembled as a whole during maintenance. Due to the narrow internal space, the disassembly is difficult, and in many cases, power cannot be cut off, and maintenance can only be carried out after power is cut off at a specific time, resulting in great difficulty in after-sales maintenance. Summary of the Utility Model

[0003] The utility model aims at the problems and deficiencies existing in the prior art, and provides a DC energy meter for charging piles.

[0004] The utility model solves the above technical problems through the following technical solutions:

[0005] The utility model provides a DC energy meter for charging piles, which is characterized in that it includes a measurement module, a measurement module protective cover, a signal acquisition module and a signal acquisition module protective cover;

[0006] A signal terminal interface is arranged at the middle position of the left side surface of the measurement module, and a function terminal interface is arranged at the edge position of the rear end of the top of the measurement module; the top of the measurement module protective cover serves as an upper shielding surface for shielding the top of the function terminal interface, and the left side surface of the measurement module protective cover is provided with a side shielding surface for shielding the signal terminal interface;

[0007] First guiding ribs and first limiting buckles are arranged at both the front and rear ends of the left side of the signal acquisition module, first guiding grooves and first limiting edges are arranged at both the front and rear ends of the right side of the signal acquisition module, and a signal output port is arranged near the middle position of the right side of the signal acquisition module; second guiding grooves corresponding to the first guiding ribs and second limiting buckles corresponding to the first limiting buckles are arranged at both the front and rear ends of the inner wall of the left side of the signal acquisition module protective cover, second guiding ribs corresponding to the first guiding grooves and second limiting edges corresponding to the first limiting edges are arranged at both the front and rear ends of the outer side of the right side of the signal acquisition module protective cover, and a wire outlet is arranged at the middle position of the right side of the signal acquisition module protective cover;

[0008] The functional end interface is connected to a functional connection line. The signal end interface is connected to one end of a signal connection line. The measuring module protective cover is installed on and fixed to the upper part of the measuring module. The upper shielding surface shields the top of the functional end interface. The side shielding surface shields the extraction path of the signal end interface.

[0009] The signal output port is connected to the other end of the signal connection line. The signal acquisition module protective cover is installed on and fixed to the upper part of the signal acquisition module. The first guiding rib is inserted into the corresponding second guiding groove. The first limiting buckle and the corresponding second limiting buckle cooperate for limiting. The second guiding rib is inserted into the corresponding first guiding groove. The second limiting edge and the corresponding first limiting edge cooperate for limiting. The signal output port is covered within the signal acquisition module protective cover. The other end of the signal connection line is led out from the wire outlet and connected to the signal end interface.

[0010] This technical solution realizes the independent installation of the measuring module and the independent installation of the signal acquisition module.

[0011] Further, chutes and first buckles are provided at both the front and rear ends of the left side surface of the measuring module. The two first buckles are located between the two chutes. First locks are provided directly above the two first buckles.

[0012] The upper shielding surface extends leftward and at the front and rear positions of the side shielding surface to form a retaining edge. A lock groove is provided inside each retaining edge.

[0013] Sliding rails corresponding to the chutes and second buckles corresponding to the first buckles are provided at both the front and rear ends of the right side of the signal acquisition module. The first buckle and the corresponding second buckle are both inclined live buckles. Second locks corresponding to the first locks extend above the two second buckles.

[0014] The signal acquisition module protective cover extends rightward and at the front and rear positions of the wire outlet to form a boss corresponding to the retaining edge.

[0015] The chutes are aligned with the corresponding sliding rails and inserted until the end. The first buckle and the corresponding second buckle are buckled. At this time, the second lock and the corresponding first lock are aligned, so that the measuring module and the signal acquisition module are installed and buckled. The signal acquisition module protective cover is installed on the upper part of the signal acquisition module. The measuring module protective cover is installed on the upper part of the measuring module. At this time, the lock groove wraps the second lock and the first lock in the aligned state, making it impossible for the first buckle and the corresponding second buckle to deform and unfasten, becoming a dead buckle that cannot be removed. The boss is covered by the corresponding retaining edge, making it impossible to remove the signal acquisition module protective cover.

[0016] This technical solution realizes the integrated installation of the measuring module and the signal acquisition module.

[0017] The positive and progressive effects of the present utility model are as follows:

[0018] The DC energy meter for charging piles designed by the present utility model can simultaneously meet two installation methods, namely, separate independent installation and integrated installation of the signal acquisition module and the measurement module, reducing the R & D cost, increasing the installation flexibility, and enhancing the market competitiveness; when integratedly installed, there is no need to separately seal the signal acquisition module and the measurement module, and only the measurement module needs to be sealed to complete the sealing of the whole machine, reducing the construction difficulty; when maintenance and replacement are required during integrated installation, the measurement module can be repaired or replaced without power-off and tools, and efficient operation can also be achieved under compact installation conditions, greatly improving the after-sales efficiency, and reducing the after-sales difficulty and after-sales cost. Brief Description of the Drawings

[0019] Figure 1 Schematic diagram of the implementation scheme of the present utility model;

[0020] Figure 2 Schematic diagram of the structure of the measurement module;

[0021] Figures 3(a)-(b) are schematic diagrams of the structure of the protective cover of the measurement module;

[0022] Figures 4(a)-(b) are schematic diagrams of the structure of the signal acquisition module;

[0023] Figures 5(a)-(c) are schematic diagrams of the structure of the protective cover of the signal acquisition module;

[0024] Figures 6(a)-(c) are schematic diagrams of the independent installation of the measurement module;

[0025] Figures 7(a)-(d) are schematic diagrams of the independent installation of the signal acquisition module;

[0026] Figure 8 Schematic diagram of the electrical connection after the independent installation of the measurement module and the signal acquisition module;

[0027] Figures 9(a)-(h) are schematic diagrams of the integrated installation of the measurement module and the signal acquisition module;

[0028] Figures 10(a)-(c) are schematic diagrams of the removal of the measurement module during after-sales maintenance in integrated installation. Detailed Embodiments

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0030] As Figure 1 shown, this embodiment provides a DC watt-hour meter for a charging pile, which includes a measurement module 1, a measurement module protective cover 2, a signal acquisition module 3, and a signal acquisition module protective cover 4.

[0031] As Figure 2 shown, it is a schematic structural diagram of the measurement module. At the front and rear ends of the upper surface of the measurement module 1, lead seal nuts 1a are respectively embedded. At the middle position of the left side surface of the measurement module 1, a signal terminal interface 1b with a plug-and-play wiring method is provided. At the rear edge position of the top of the measurement module 1, a function terminal interface with a fixed interface wiring method is provided. The function terminal interface consists of a fastening screw 1c and a wiring port 1d. The fastening screw 1c is directly above the wiring port 1d, and the wiring port 1d faces backward. At the front and rear ends of the left side surface of the measurement module 1, sliding grooves 1f and first buckles 1e are provided. The two first buckles 1e at both ends are located between the two sliding grooves 1f at both sides. Above the two first buckles 1e at both ends, first locking buckles 1g are provided.

[0032] As shown in FIGS. 3(a)-(b), it is a schematic structural diagram of the measurement module protective cover. At the front and rear ends of the upper shielding surface 2b of the measurement module protective cover 2, lead seal screw grooves 2a corresponding to the lead seal nuts 1a are respectively opened. The top of the measurement module protective cover 2 serves as the upper shielding surface 2b for shielding the top of the function terminal interface. On the left side surface of the measurement module protective cover 2, a side shielding surface 2c for shielding the signal terminal interface 1b is provided. The upper shielding surface 2b extends to the left and is located at the front and rear positions of the side shielding surface 2c with a retaining edge 2e. Inside each retaining edge 2e, a locking buckle groove 2d is provided.

[0033] As shown in FIGS. 4(a)-(b), it is a schematic structural diagram of the signal acquisition module. At the front and rear ends of the left side of the signal acquisition module 3, two first guiding ribs 3a are provided at intervals. Between the two first guiding ribs 3a at each end, a first limiting buckle 3b is fixed. The two first guiding ribs 3a and the first limiting buckle 3b at each end form a U-shape. At the front and rear ends of the left side of the signal acquisition module 3, first lead seal holes 3c are also provided. At the front and rear ends of the right side of the signal acquisition module 3, first guiding grooves 3d and first limiting edges 3e are provided. The two first limiting edges 3e at the front and rear are located between the two first guiding grooves 3d at the front and rear. Near the middle position of the right side of the signal acquisition module 3, a signal output port 3f is provided. At the front and rear ends of the right side of the signal acquisition module 3, sliding rails 3h corresponding to the sliding grooves 1f and second buckles 3g corresponding to the first buckles 1e are provided. The first buckle 1e and the corresponding second buckle 3g are both inclined live buckles. Above the two second buckles 3g at both ends, second locking buckles 3i corresponding to the first locking buckles 1g extend.

[0034] As shown in FIGS. 5(a)-(c), it is a schematic structural diagram of the protective cover of the signal acquisition module. At the front and rear ends of the inner wall on the left side of the protective cover 4 of the signal acquisition module, two second guide grooves 4a corresponding to the first guide ribs 3a and spaced apart are provided. Between the two second guide grooves 4a at each end, a second limit buckle 4b corresponding to the first limit buckle 3b is fixed. At the front and rear ends of the bottom of the inner wall on the left side of the protective cover 4 of the signal acquisition module, second lead seal holes 4c corresponding to the first lead seal holes 3c are further opened. At the front and rear ends of the outer side on the right side of the protective cover 4 of the signal acquisition module, second guide ribs 4d corresponding to the first guide grooves 3d and second limit edges 4e corresponding to the first limit edges 3e are provided. At the middle position on the right side of the protective cover 4 of the signal acquisition module, a wire outlet 4f is opened. The protective cover 4 of the signal acquisition module extends to the right and at the front and rear positions of the wire outlet 4f, and there are bosses 4g corresponding to the baffle edges 2e.

[0035] As shown in FIGS. 6(a)-(c), it is a schematic diagram of the independent installation of the measurement module 1. As shown in FIG. 6(a), the wiring port 1d of the functional end interface of the measurement module 1 is connected to the functional connection wire 102, and one end of the signal connection wire 101 is connected to the signal end interface 1b; after wiring, the measurement module protective cover 2 is installed on the upper part of the measurement module 1. The upper shielding surface 2b of the measurement module protective cover 2 shields the fastening screw 1c of the functional end interface, and the side shielding surface 2c shields the extraction path of the plug of the signal end interface 1b, as shown in FIG. 6(b); the lead seal screws 5 inserted into each lead seal screw groove 2a are screwed with the corresponding lead seal nuts 1a, and each lead seal screw 5 is covered with a lead seal cover 6. After the lead seal screws 5 and the lead seal covers 6 are installed in the lead seal screw grooves 2a on the measurement module protective cover 2 to complete the lead seal, it is installed at the designated position, and the measurement module is completed with independent installation. The installation state after completion is shown in FIG. 6(c). In this example, the bottom of the measurement module has a rail installation structure, which is a general technology and will not be described. The other end of the signal connection wire 101 connected to the signal end interface 1b is connected to the signal acquisition module 3.

[0036] As shown in Figures 7(a)-(d) is the schematic diagram of the independent installation of the signal acquisition module 3. As shown in Figure 7(a), in combination with Figures 4 and 5, the signal output port 3f of the signal acquisition module 3 is connected to the other end of the signal connection line 101; install the signal acquisition module protective cover 4 as shown in the figure. The second guide groove 4a, the second limit buckle 4b and the second lead seal hole 4c on the left side of the signal acquisition module protective cover 4 respectively correspond to the first guide rib 3a, the first limit buckle 3b and the first lead seal hole 3c on the left side of the signal acquisition module 3. The second guide rib 4d and the second limit edge 4e on the right side of the signal acquisition module protective cover 4 respectively correspond to the first guide groove 3d and the first limit edge 3e on the right side of the signal acquisition module 3. The signal acquisition module protective cover 4 is installed on the upper part of the signal acquisition module 3. At this time, the first guide rib 3a is inserted into the corresponding second guide groove 4a, the first limit buckle 3b and the corresponding second limit buckle 4b are cooperatively limited, the first lead seal hole 3c and the second lead seal hole 4c are in corresponding positions, the second guide rib 4d is inserted into the corresponding first guide groove 3d, and the second limit edge 4e and the corresponding first limit edge 3e are cooperatively limited, as shown in Figure 7(b); after being installed in place, the first lead seal hole 3c of the signal acquisition module 3 and the second lead seal hole 4c of the signal acquisition module protective cover 4 are in corresponding positions. The first lead seal hole 3c and the second lead seal hole 4c are sealed with a lead seal tool 103 and installed at the designated position, and the signal acquisition module 3 completes the independent installation, as shown in Figure 7(c); the signal output port 3f of the signal acquisition module 3 is covered inside the signal acquisition module protective cover 4, and the signal connection line 101 is led out from the wire outlet 4f of the signal acquisition module protective cover 4 and the other end is connected to the signal end interface 1b of the measurement module 1, as shown in Figure 7(d); among them, the A-A cross-sectional view can show that the second guide groove 4a on the left side of the signal acquisition module protective cover 4 and the first guide rib 3a on the left side of the signal acquisition module 3 are cooperatively arranged. The second guide rib 4d and the second limit edge 4e on the right side of the signal acquisition module protective cover 4 respectively cooperate with the first guide groove 3d and the first limit edge 3e on the right side of the signal acquisition module 3, so that the signal acquisition module protective cover 4 can only be installed and removed along the structural guiding direction. As can be seen from the B-B cross-sectional view, the second limit buckle 4b of the signal acquisition module protective cover 4 and the first limit buckle 3b on the left side of the signal acquisition module 3 are cooperatively arranged. The second limit buckle 4b is a live buckle, and the signal acquisition module protective cover 4 can be unbuckled and removed by applying a force in the opposite direction to the installation direction without using tools.

[0037] As Figure 8It is a schematic diagram of the electrical connection after the measurement module 1 and the signal acquisition module 3 are installed independently. The measurement module 1 is sealed with a lead seal screw 5 and a lead seal cover 6. After sealing, the side shielding surface 2c of the measurement module protective cover 2 blocks the plug removal path of the signal connection line 101 connected to the signal terminal interface 1b; the signal acquisition module 3 is sealed with a lead seal tool 103, and the signal output port 3f of the signal acquisition module 3 is covered inside the signal acquisition module protective cover 4, and the signal connection line 101 is led out from the wire outlet 4f of the signal acquisition module protective cover 4; the measurement module 1 and the signal acquisition module 3 are electrically connected by the signal connection line 101.

[0038] As shown in Figures 9(a)-(h) is a schematic diagram of the integrated installation of the measurement module and the signal acquisition module. As shown in Figure 9(a), after the signal output port 3f of the signal acquisition module 3 and the signal terminal interface 1b of the measurement module 1 are connected by the signal connection line 101, the measurement module 1 is inserted into the slide rails 3h at both ends on the right side of the signal acquisition module 3 with the chutes 1f at both ends on the left side aligned, as shown in Figures 9(b1)-(b2); when it is inserted to the bottom, the first buckles 1e at both ends on the left side of the measurement module 1 are buckled with the second buckles 3g at both ends on the right side of the signal acquisition module 3. At this time, the second lock 3i on the signal acquisition module 3 and the first lock 1g on the measurement module 1 are aligned. The first buckles 1e at both ends on the left side of the measurement module 1 and the second buckles 3g at both ends on the right side of the signal acquisition module 3 are all inclined live buckles. Without using tools, only applying a force in the opposite direction of the insertion direction to the measurement module 1 can unfasten the buckle and remove the measurement module 1 from the signal acquisition module 3. As shown in Figure 9(c), after the measurement module 1 and the signal acquisition module 3 are installed and buckled, the functional terminal interface of the measurement module 1 is wired. Then, the signal acquisition module protective cover 4 is installed first. The signal acquisition module protective cover 4 is installed on the upper part of the signal acquisition module 3, as shown in Figure 9(d). Finally, the measurement module protective cover 2 is installed. The measurement module protective cover 2 is installed on the upper part of the measurement module 1, as shown in Figures 9(e)-(f). The measurement module protective cover 2 is sealed with a lead seal screw 5 and a lead seal cover 6 and installed in the designated position to complete the integrated installation. As shown in Figure 9(g), at this time, the lock groove 2d on the measurement module protective cover 2 wraps the second lock 3i and the first lock 1g in the aligned state, making the first buckle 1e of the measurement module 1 and the second buckle 3g of the signal acquisition module 3 unable to deform and unfasten and become a dead buckle that cannot be removed. As shown in the C-C cross-sectional view in Figure 9(h), the convex platform 4g extending to the right of the signal acquisition module protective cover 4 is covered by the edge 2e extending to the left by the upper shielding surface 2b of the measurement module protective cover 2, making the signal acquisition module protective cover 4 unable to be removed. From this, it can be obtained that for the integrated installation of the DC energy meter of the present invention, only the measurement module protective cover 2 needs to be sealed to complete the sealing of the whole machine during the integrated installation.

[0039] As shown in Figures 10(a)-(c), it is a schematic diagram of the measurement module during after-sales maintenance and removal in integrated installation. When the integrated DC electricity meter needs to be repaired, since the circuit boards are all in the measurement module 1, only the measurement module 1 needs to be repaired without removing the whole machine. When it is necessary to remove the measurement module 1 for repair or replacement, as shown in Figures 10(a)-(b), only the lead seal cover 6 needs to be damaged, the lead seal screw 5 is unscrewed, and the measurement module protective cover 2 is removed. There is no need to remove the signal acquisition module protective cover 4. At this time, the first buckles 1e at both ends on the left side of the measurement module 1 and the second buckles 3g at both ends on the right side of the signal acquisition module 3 are unlocked to become loose buckles. As shown in Figure 10(c), without using tools, only a force in the opposite direction to the installation direction needs to be applied to the measurement module 1 to unhook and remove the measurement module 1. Moreover, damaging the lead seal cover 6, unscrewing the lead seal screw 5, removing the measurement module protective cover 2, and removing the measurement module 1 are all in the opposite direction to the installation direction of the measurement module 1, not affected by other surrounding installation components, and can be operated under compact installation conditions. The signal acquisition module 3 is the high-voltage part. Since the signal acquisition module protective cover 4 is in the installed state at this time, it can ensure the safety of live construction, and the measurement module 1 can be repaired or replaced without cutting off the power supply.

[0040] This DC electricity meter for charging piles can meet both the separate independent installation and integrated installation methods of the signal acquisition module and the measurement module, reducing the R & D cost, increasing the installation flexibility, and enhancing the market competitiveness; during integrated installation, there is no need to separately seal the signal acquisition module and the measurement module. Only by sealing the measurement module can the whole machine be sealed, reducing the construction difficulty; when repair and replacement are needed during integrated installation, there is no need to cut off the power supply or use tools to repair or replace the measurement module, and it can also be efficiently operated under compact installation conditions, greatly improving the after-sales efficiency and reducing the after-sales difficulty and cost.

[0041] Although the specific implementation manners of the present invention have been described above, those skilled in the art should understand that these are only examples. The protection scope of the present invention is defined by the appended claims. Without departing from the principles and essence of the present invention, those skilled in the art can make various changes or modifications to these implementation manners, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A DC energy meter for a charging pile, characterized in that, It includes a measurement module, a measurement module protective cover, a signal acquisition module, and a signal acquisition module protective cover; A signal terminal interface is provided at the middle position of the left side surface of the measurement module, and a function terminal interface is provided at the edge position of the rear end of the top of the measurement module; the top of the measurement module protective cover serves as an upper shielding surface for shielding the top of the function terminal interface, and the left side surface of the measurement module protective cover is provided with a side shielding surface for shielding the signal terminal interface; First guiding ribs and first limiting buckles are provided at both the front and rear ends of the left side of the signal acquisition module, first guiding grooves and first limiting edges are provided at both the front and rear ends of the right side of the signal acquisition module, and a signal output port is provided near the middle position of the right side of the signal acquisition module; second guiding grooves corresponding to the first guiding ribs and second limiting buckles corresponding to the first limiting buckles are provided at both the front and rear ends of the inner wall of the left side of the signal acquisition module protective cover, second guiding ribs corresponding to the first guiding grooves and second limiting edges corresponding to the first limiting edges are provided at both the front and rear ends of the outer side of the right side of the signal acquisition module protective cover, and a wire outlet is provided at the middle position of the right side of the signal acquisition module protective cover; The function terminal interface accesses a function connection wire, one end of the signal connection wire is connected to the signal terminal interface, the measurement module protective cover is installed on the upper part of the measurement module and fixed, the upper shielding surface shields the top of the function terminal interface, and the side shielding surface shields the extraction path of the signal terminal interface; The other end of the signal connection wire is connected to the signal output port, the signal acquisition module protective cover is installed on the upper part of the signal acquisition module and fixed, the first guiding rib is guided into the corresponding second guiding groove, the first limiting buckle and the corresponding second limiting buckle are cooperatively limited, the second guiding rib is guided into the corresponding first guiding groove, the second limiting edge and the corresponding first limiting edge are cooperatively limited, the signal output port is covered inside the signal acquisition module protective cover, and the other end of the signal connection wire is led out from the wire outlet and connected to the signal terminal interface.

2. The DC energy meter for charging pile according to claim 1, wherein, Chutes and first buckles are provided at both the front and rear ends of the left side surface of the measurement module, the two first buckles are located between the two chutes, and first locking buckles are provided directly above the two first buckles; The upper shielding surface extends leftward and at the front and rear positions of the side shielding surface to have a retaining edge, and a locking buckle groove is provided inside each retaining edge; Sliding rails corresponding to the chutes and second buckles corresponding to the first buckles are provided at both the front and rear ends of the right side of the signal acquisition module, the first buckle and the corresponding second buckle are both inclined live buckles, and second locking buckles corresponding to the first locking buckles extend above the two second buckles; The signal acquisition module protective cover extends rightward and at the front and rear positions of the wire outlet to have a convex platform corresponding to the retaining edge; The slide rail corresponding to the chute alignment is inserted and inserted to the end, and the first buckle is buckled with the corresponding second buckle. At this time, the second lock buckle is aligned with the corresponding first lock buckle, so that the measurement module and the signal acquisition module are installed and buckled. The signal acquisition module protective cover is installed on the upper part of the signal acquisition module, and the measurement module protective cover is installed on the upper part of the measurement module. At this time, the lock groove wraps the second lock buckle and the first lock buckle in the aligned state, so that the first buckle and the corresponding second buckle cannot be deformed and disengaged to become a dead buckle that cannot be removed. The convex platform is covered by the corresponding edge, so that the signal acquisition module protective cover cannot be removed.

3. The DC energy meter for charging pile according to claim 1, characterized in that, On both the front and rear ends of the left side of the signal acquisition module, two first guiding ribs are arranged at intervals. A first limiting buckle is fixed between the two first guiding ribs at each end. The two first guiding ribs and the first limiting buckle at each end form a gate shape. On both the front and rear ends of the inner wall of the left side of the signal acquisition module protective cover, two second guiding grooves corresponding to the first guiding ribs are arranged at intervals. A second limiting buckle corresponding to the first limiting buckle is fixed between the two second guiding grooves at each end.

4. The DC energy meter for charging pile according to claim 1, wherein The front and rear first limiting edges are located between the front and rear first guiding grooves.

5. The DC watt-hour meter for charging pile according to claim 1, characterized in that, On the front and rear ends of the upper surface of the measurement module, lead seal nuts are respectively embedded. On the front and rear ends of the upper shielding surface of the measurement module protective cover, lead seal screw grooves corresponding to the lead seal nuts are respectively opened. The lead seal screws inserted into each lead seal screw groove are screwed with the corresponding lead seal nuts, and each lead seal screw is covered with a lead seal cover.

6. The DC energy meter for charging pile according to claim 1, characterized in that, On the front and rear ends of the bottom of the inner wall of the left side of the signal acquisition module, first lead seal holes are also arranged. On the front and rear ends of the bottom of the inner wall of the left side of the signal acquisition module protective cover, second lead seal holes corresponding to the first lead seal holes are also opened. When the signal acquisition module protective cover is installed on the upper part of the signal acquisition module, the positions of the first lead seal holes and the second lead seal holes correspond to each other. The first lead seal holes and the second lead seal holes are lead-sealed with a lead-sealing tool and installed at the specified positions.

7. The DC energy meter for charging pile according to claim 1, characterized in that, The signal terminal interface is a plug-and-unplug wiring method, and the side shielding surface shields the extraction path of the plug of the signal terminal interface.

8. The DC energy meter for a charging pile according to claim 1, wherein The function terminal interface is a fixed interface wiring method. The function terminal interface consists of a fastening screw and a wiring port. The fastening screw is located directly above the wiring port. The wiring port of the function terminal interface accesses a function connection wire, and the upper shielding surface shields the fastening screw.

9. The DC energy meter for a charging pile according to claim 1, characterized in that The second limiting buckle is a movable buckle.

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