Modularized direct current electric energy meter

Abstract

The invention discloses a modularized direct-current electric energy meter which comprises a measuring module, a measuring module protective cover, a signal acquisition module and a signal acquisition module protective cover. According to the modularized direct-current electric energy meter, 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 invention relates to the technical field of direct current electric energy meters, and in particular to a modular direct current electric energy meter. Background Art

[0002] The DC energy meter for charging piles consists of a signal acquisition module and a measurement module. According to actual installation needs, 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 connected with a signal connection line; the other is that the signal acquisition module and the measurement module are installed together to save installation space. This installation method is suitable for small charging piles with insufficient internal installation space. The two installation methods are different and require the development of two DC energy meters with different structural forms. When the signal acquisition module and the measurement module are installed integrally in a small charging pile, the DC energy meter needs to be disassembled as a whole for maintenance. Due to the small internal space, disassembly is difficult, and the power cannot be cut off in many cases. It is necessary to wait for a specific time to cut off the power for maintenance, and after-sales maintenance is difficult. Summary of the invention

[0003] The present invention aims at solving the problems and shortcomings of the prior art and provides a modular direct current electric energy meter.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] The present invention provides a modular direct current electric energy meter, which is characterized in that it comprises a measuring module, a measuring module protective cover, a signal acquisition module and a signal acquisition module protective cover;

[0006] A signal end interface is provided at the middle position of the left side of the measuring module, and a function end interface is provided at the top rear end edge of the measuring module;

[0007] The top of the measuring module protective cover serves as an upper shielding surface for shielding the top of the functional end interface, and the left side of the measuring module protective cover is provided with a side shielding surface for shielding the signal end interface;

[0008] The front and rear ends of the left side of the signal acquisition module are each provided with two first guide ribs arranged at intervals, a first limit buckle is fixed between the two first guide ribs at each end, and the two first guide ribs and the first limit buckle at each end form a door shape, the front and rear ends of the right side of the signal acquisition module are provided with a first guide groove and a first limit edge, and the front and rear first limit edges are located between the front and rear first guide grooves, and a signal output port is provided on the right side of the signal acquisition module near the middle position;

[0009] The front and rear ends of the left inner wall of the signal acquisition module protective cover are both provided with two second guide grooves corresponding to the first guide ribs arranged at intervals, and a second limit buckle corresponding to the first limit buckle is fixed between the two second guide grooves at each end, and the front and rear ends of the right outer side of the signal acquisition module protective cover are both provided with second guide ribs corresponding to the first guide grooves and second limit edges corresponding to the first limit edges, and a wire outlet is opened at the middle position of the right side of the signal acquisition module protective cover;

[0010] The functional end interface is connected to the functional connection line, the signal end interface is connected to one end of the signal connection line, the measuring module protective cover is installed on the upper part of the measuring module and fixed, the upper shielding surface shields the top of the functional end interface, and the side shielding surface shields the extraction path of the signal end interface;

[0011] The signal output port is connected to the other end of the signal connection line, the signal acquisition module protective cover is installed on the upper part of the signal acquisition module and fixed, the first guide rib is introduced into the corresponding second guide groove, the first limit buckle and the corresponding second limit buckle cooperate to limit, the second guide rib is introduced into the corresponding first guide groove, the second limit edge and the corresponding first limit edge cooperate to limit, the signal output port is covered in the signal acquisition module protective cover, and the other end of the signal connection line is led out from the outlet and connected to the signal end interface.

[0012] This technical solution realizes the independent installation of the measurement module and the independent installation of the signal acquisition module.

[0013] Furthermore, a slide groove and a first buckle are provided at the front and rear ends of the left side of the measuring module, the first buckles at both ends are located between the slide grooves on both sides, and a first lock buckle is provided just above the first buckles at both ends;

[0014] The upper shielding surface is provided with a retaining edge extending toward the left side and located in front and behind the side shielding surface, and a locking groove is provided on the inner side of each retaining edge;

[0015] The front and rear ends of the right side of the signal acquisition module are both provided with a slide rail corresponding to the slide groove and a second buckle corresponding to the first buckle, the first buckle and the corresponding second buckle are both active buckles with an inclination, and a second buckle corresponding to the first buckle is extended above the second buckle at both ends;

[0016] The signal acquisition module protective cover is provided with a boss corresponding to the retaining edge extending to the right and located in front and behind the outlet;

[0017] The slide rail corresponding to the slide groove is installed and installed to the bottom, 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, and 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 buckle 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, and become a dead buckle that cannot be removed, and the boss is covered by the corresponding retaining edge, so that the signal acquisition module protective cover cannot be removed.

[0018] This technical solution realizes the integrated installation of the measurement module and the signal acquisition module.

[0019] The positive and progressive effects of the present invention are:

[0020] The modular DC energy meter designed in the present invention can simultaneously meet two installation modes: separate independent installation of the signal acquisition module and the measurement module and integrated installation, which reduces research and development costs, increases installation flexibility, and increases market competitiveness; during integrated installation, there is no need to lead seal the signal acquisition module and the measurement module separately, and only the measurement module needs to be sealed to complete the sealing of the entire machine, which reduces the construction difficulty; when the integrated installation needs to be repaired or replaced, the measurement module can be repaired or replaced without powering off or using tools, and it can also be efficiently operated under compact installation conditions, which greatly improves after-sales efficiency and reduces after-sales difficulty and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of an implementation scheme of the present invention;

[0022] Figure 2 It is a schematic diagram of the measurement module structure;

[0023] Figure 3 (a)-(b) is a schematic diagram of the structure of the protective cover of the measurement module;

[0024] Figure 4 (a)-(b) is a schematic diagram of the structure of the signal acquisition module;

[0025] Figure 5 (a)-(c) are schematic diagrams of the structure of the signal acquisition module protective cover;

[0026] Figure 6 (a)-(c) are schematic diagrams of independent installation of the measurement module;

[0027] Figure 7 (a)-(d) is a schematic diagram of independent installation of the signal acquisition module;

[0028] Figure 8 This is the electrical connection diagram after the measurement module and signal acquisition module are installed independently;

[0029] Figure 9 (a)-(h) is a schematic diagram of the integrated installation of the measurement module and the signal acquisition module;

[0030] Figure 10 (a)-(c) Schematic diagram of the measurement module removed during after-sales maintenance during integrated installation. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] like Figure 1 As shown, this embodiment provides a modular direct current electric energy meter, including a measuring module 1, a measuring module protective cover 2, a signal acquisition module 3 and a signal acquisition module protective cover 4.

[0033] like Figure 2 The figure is a schematic diagram of the structure of the measuring module. The front and rear ends of the upper surface of the measuring module 1 are respectively embedded with lead sealing nuts 1a, a signal end interface 1b with a plug-in wiring method is provided at the middle position of the left side of the measuring module 1, and a functional end interface with a fixed interface wiring method is provided at the edge of the top rear end of the measuring module 1. The functional end interface consists of a fastening screw 1c and a wiring port 1d. The fastening screw 1c is located directly above the wiring port 1d, and the wiring port 1d faces backwards. The left front and rear ends of the measuring module 1 are both provided with a slide groove 1f and a first buckle 1e. The first buckles 1e at both ends are located between the slide grooves 1f on both sides, and the first lock buckles 1g are provided directly above the first buckles 1e at both ends.

[0034] As shown in Figure 3 (a)-(b), it is a schematic diagram of the structure of the measuring module protective cover. The front and rear ends of the upper shielding surface 2b of the measuring module protective cover 2 are respectively provided with lead sealing screw grooves 2a corresponding to the lead sealing nuts 1a, the top of the measuring module protective cover 2 is used as the upper shielding surface 2b for shielding the top of the functional end interface, and the left side of the measuring module protective cover 2 is provided with a side shielding surface 2c for shielding the signal end interface 1b, and the upper shielding surface 2b extends to the left side and is located in front and behind the side shielding surface 2c. A retaining edge 2e is extended, and a locking groove 2d is provided on the inner side of each retaining edge 2e.

[0035] As shown in Fig. 4 (a)-(b), it is a schematic diagram of the structure of the signal acquisition module. The front and rear ends of the left side of the signal acquisition module 3 are both provided with two first guide ribs 3a arranged at intervals, and a first limit buckle 3b is fixed between the two first guide ribs 3a at each end, and the two first guide ribs 3a and the first limit buckle 3b at each end form a door shape. The front and rear ends of the left side of the signal acquisition module 3 are also provided with a first lead sealing hole 3c, and the front and rear ends of the right side of the signal acquisition module 3 are provided with a first guide groove 3d and a first limit edge 3e, and the front and rear two first limit edges 3e are located between the front and rear two first guide grooves 3d. A signal output port 3f is provided near the middle position on the right side of the signal acquisition module 3, and the front and rear ends of the right side of the signal acquisition module 3 are both provided with a slide rail 3h corresponding to the slide groove 1f and a second buckle 3g corresponding to the first buckle 1e. The first buckle 1e and the corresponding second buckle 3g are both movable buckles with an inclination, and the second buckles 3i corresponding to the first lock buckle 1g are extended above the second buckles 3g at both ends.

[0036] As shown in Figure 5 (a)-(c), it is a schematic diagram of the structure of the signal acquisition module protective cover. The front and rear ends of the left inner wall of the signal acquisition module protective cover 4 are both provided with two second guide grooves 4a corresponding to the first guide rib 3a at intervals, and a second limit buckle 4b corresponding to the first limit buckle 3b is fixed between the two second guide grooves 4a at each end. The front and rear ends of the bottom of the left inner wall of the signal acquisition module protective cover 4 are also provided with a second lead sealing hole 4c corresponding to the first lead sealing hole 3c. The front and rear ends of the right outer side of the signal acquisition module protective cover 4 are both provided with a second guide rib 4d corresponding to the first guide groove 3d and a second limit edge 4e corresponding to the first limit edge 3e. The signal acquisition module protective cover 4 is provided with an outlet 4f at the middle position on the right side, and the signal acquisition module protective cover 4 is extended to the right side and is located in front and behind the outlet 4f. The boss 4g corresponding to the retaining edge 2e extends from the signal acquisition module protective cover 4 to the front and rear positions of the outlet 4f.

[0037] Figures 6(a)-(c) are schematic diagrams of independent installation of the measurement module 1. As shown in Figure 6(a), the wiring port 1d of the functional end interface of the measurement module 1 is connected to the functional connection line 102, and the signal end interface 1b is connected to one end of the signal connection line 101; after the wiring is completed, the measurement module protective cover 2 is installed on the upper part of the measurement module 1, and 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 plug removal path of the signal end interface 1b, as shown in Figure 6(b); the lead sealing screw 5 inserted into each lead sealing screw groove 2a is screwed with the corresponding lead sealing nut 1a, and each lead sealing screw 5 is covered with a lead sealing cover 6. After the lead sealing screw 5 and the lead sealing cover 6 are installed in the lead sealing screw groove 2a on the measurement module protective cover 2 to complete the lead sealing, it is installed to the specified position, and the measurement module is installed separately. The completed installation state is shown in Figure 6(c). The guide rail installation structure at the bottom of the exemplary measurement module is used as an example and will not be described. The other end of the signal connection line 101 connected to the signal end interface 1 b is connected to the signal acquisition module 3 .

[0038] Figures 7(a)-(d) are schematic diagrams of 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; the signal acquisition module protective cover 4 is installed as shown in the figure, and the second guide groove 4a, the second limit buckle 4b and the second lead sealing hole 4c on the left side of the signal acquisition module protective cover 4 correspond to the first guide rib 3a, the first limit buckle 3b and the first lead sealing hole 3c on the left side of the signal acquisition module 3, respectively, and the second guide rib 4d and the second limit edge 4e on the right side of the signal acquisition module protective cover 4 correspond to the first guide groove 3d and the first limit buckle 3b on the right side of the signal acquisition module 3, respectively. 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 introduced into the corresponding second guide groove 4a, the first limiting buckle 3b and the corresponding second limiting buckle 4b cooperate to limit, the first lead sealing hole 3c and the second lead sealing hole 4c are corresponding in position, the second guide rib 4d is introduced into the corresponding first guide groove 3d, and the second limiting edge 4e and the corresponding first limiting edge 3e cooperate to limit, as shown in Figure 7 (b); after being installed in place, the first lead sealing hole 3c of the signal acquisition module 3 and the second lead sealing hole 4c of the signal acquisition module protective cover 4 are relatively The first lead sealing hole 3c and the second lead sealing hole 4c are sealed with a lead sealing tool 103 and installed in the designated position, and the signal acquisition module 3 is independently installed, as shown in FIG7(c); the signal output port 3f of the signal acquisition module 3 is covered in the signal acquisition module protective cover 4, and the signal connection line 101 is led out from the outlet port 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 FIG7(d); the AA cross-sectional view shows the second guide groove 4a on the left side of the signal acquisition module protective cover 4 and the first guide groove 4b on the left side of the signal acquisition module 3. The guide rib 3a cooperates with the second guide rib 4d and the second limiting 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 limiting 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 guide direction. It can be seen from the BB cross-sectional view that the second limiting buckle 4b of the signal acquisition module protective cover 4 cooperates with the first limiting buckle 3b on the left side of the signal acquisition module 3, and the second limiting buckle 4b is a loose buckle, which can be disengaged and removed without using tools by applying a force opposite to the installation direction to the signal acquisition module protective cover 4.

[0039] like Figure 8This is a schematic diagram of electrical connection after the measurement module 1 and the signal acquisition module 3 are independently installed. The measurement module 1 is sealed with a sealing screw 5 and a sealing cover 6. After sealing, the side shielding surface 2c of the measurement module protective cover 2 blocks the plug-out path of the signal connection line 101 connected to the signal end interface 1b; the signal acquisition module 3 is sealed with a sealing tool 103, the signal output port 3f of the signal acquisition module 3 is covered in the signal acquisition module protective cover 4, and the signal connection line 101 is led out from the outlet 4f of the signal acquisition module protective cover 4; the measurement module 1 and the signal acquisition module 3 are electrically connected with the signal connection line 101.

[0040] Figure 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 end interface 1b of the measurement module 1 are connected by the signal connection line 101, the slide grooves 1f of the left end of the measurement module 1 are aligned with the slide rails 3h of the right end of the signal acquisition module 3, as shown in Figure 9(b1)-(b2); when installed to the bottom, the first buckles 1e at the left end of the measurement module 1 are buckled with the second buckles 3g at the right end of the signal acquisition module 3. At this time, the second lock buckle 3i on the signal acquisition module 3 and the first lock buckle 1g of the measurement module 1 are aligned. The first buckle 1e at the left end of the measurement module 1 and the second buckle 3g at the right end of the signal acquisition module 3 are both inclined buckles. No tools are needed. Only a force opposite to the direction of installation is applied to the measurement module 1 to release 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 end interface of the measurement module 1 is wired, and 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), and 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), and the measurement module protective cover 2 is sealed with a lead sealing screw 5 and a lead sealing cover 6 and installed to a specified position to complete the integrated installation, as shown in Figure 9(g). At this time, the locking groove 2d on the measurement module protective cover 2 wraps the second locking buckle 3i and the first locking buckle 1g in the matched state, so that the first buckle 1e of the measurement module 1 and the second buckle 3g of the signal acquisition module 3 cannot be deformed and disengaged, and become a dead buckle that cannot be removed. As shown in the CC cross-sectional view in Figure 9(h), the boss 4g extending from the right side of the signal acquisition module protective cover 4 is covered by the retaining edge 2e extending to the left side of the upper shielding surface 2b of the measurement module protective cover 2, so that the signal acquisition module protective cover 4 cannot be removed. It can be concluded that the integrated installation of the DC electric energy meter of the present invention only needs to seal the measurement module protective cover 2 to complete the lead sealing of the entire machine during the integrated installation.

[0041] As shown in Figures 10(a)-(c), after-sales maintenance and removal of the measuring module during integrated installation, when the integrated DC energy meter needs to be repaired, since the circuit boards are all inside the measuring module 1, only the measuring module 1 needs to be repaired, and there is no need to remove the entire machine. When the measuring module 1 needs to be removed for repair or replacement, as shown in Figures 10(a)-(b), only the lead seal cover 6 needs to be destroyed, the lead seal screw 5 needs to be unscrewed, and the measuring module protective cover 2 needs to be removed. There is no need to remove the signal acquisition module protective cover 4. At this time, the first buckles 1e at both ends of the left side of the measuring module 1 and the second buckles 3g at both ends of the right side of the signal acquisition module 3 are unlocked and become loose buckles, as shown in Figures 10(a)-(b). As shown in Fig. 10(c), the measuring module 1 can be disengaged by applying a force in the opposite direction of installation to the measuring module 1 without using tools, and the removal of the lead seal cover 6, the removal of the lead seal screw 5, the removal of the measuring module protective cover 2 and the removal of the measuring module 1 are all in the same direction, which is the opposite direction of the installation direction of the measuring module 1. It is not affected by other surrounding installation components and can be operated under compact installation conditions. The signal acquisition module 3 is a strong current part. Since the signal acquisition module protective cover 4 is in the installed state at this time, the safety of live construction can be guaranteed, and the measuring module 1 can be repaired or replaced without cutting off the power supply.

[0042] This modular DC energy meter can meet both independent installation and integrated installation of the signal acquisition module and the measurement module, reducing R&D costs, increasing installation flexibility, and increasing market competitiveness. During integrated installation, there is no need to seal the signal acquisition module and the measurement module separately, only the measurement module needs to be sealed to complete the sealing of the entire machine, reducing construction difficulty. When the integrated installation requires maintenance or replacement, the measurement module can be repaired or replaced without powering off or using tools, and it can be operated efficiently under compact installation conditions, greatly improving after-sales efficiency and reducing after-sales difficulty and cost.

[0043] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A modular DC electric energy meter, characterized in that: It comprises a measuring module (1), a measuring module protective cover (2), a signal acquisition module (3) and a signal acquisition module protective cover (4); A signal end interface (1b) is provided at the middle position of the left side surface of the measuring module (1), and a function end interface is provided at the top rear end edge position of the measuring module (1); The top of the measuring module protective cover (2) serves as an upper shielding surface (2b) for shielding the top of the functional end interface, and the left side surface of the measuring module protective cover (2) is provided with a side shielding surface (2c) for shielding the signal end interface (1b); The front and rear ends of the left side of the signal acquisition module (3) are both provided with two first guide ribs (3a) arranged at intervals, a first limit buckle (3b) is fixed between the two first guide ribs (3a) at each end, the two first guide ribs (3a) and the first limit buckle (3b) at each end form a gate shape, the front and rear ends of the right side of the signal acquisition module (3) are both provided with a first guide groove (3d) and a first limit edge (3e), the front and rear two first limit edges (3e) are located between the front and rear two first guide grooves (3d), and a signal output port (3f) is provided on the right side of the signal acquisition module (3) near the middle position; The front and rear ends of the left inner wall of the signal acquisition module protective cover (4) are both provided with two second guide grooves (4a) arranged at intervals and corresponding to the first guide ribs (3a); a second limit buckle (4b) corresponding to the first limit buckle (3b) is fixed between the two second guide grooves (4a) at each end; the front and rear ends of the right outer side of the signal acquisition module protective cover (4) are both provided with second guide ribs (4d) corresponding to the first guide grooves (3d) and second limit edges (4e) corresponding to the first limit edges (3e); and a wire outlet (4f) is provided at the middle position on the right side of the signal acquisition module protective cover (4); The functional end interface is connected to the functional connection line (102), the signal end interface (1b) is connected to one end of the signal connection line (101), the measurement module protective cover (2) is installed on the upper part of the measurement module (1) and fixed, the upper shielding surface (2b) shields the top of the functional end interface, and the side shielding surface (2c) shields the extraction path of the signal end interface (1b); The signal output port (3f) is connected to the other end of the signal connection line (101); the signal acquisition module protective cover (4) is installed on the upper part of the signal acquisition module (3) and fixed; the first guide rib (3a) is introduced into the corresponding second guide groove (4a); the first limit buckle (3b) and the corresponding second limit buckle (4b) cooperate to limit; the second guide rib (4d) is introduced into the corresponding first guide groove (3d); the second limit edge (4e) and the corresponding first limit edge (3e) cooperate to limit; the signal output port (3f) is covered in the signal acquisition module protective cover (4); the other end of the signal connection line (101) is led out from the outlet (4f) and connected to the signal end interface (1b).

2. The modular DC electric energy meter according to claim 1, characterized in that: A slide groove (1f) and a first buckle (1e) are provided at the front and rear ends of the left side of the measuring module 1, the first buckles (1e) at both ends are located between the slide grooves (1f) on both sides, and a first lock buckle (1g) is provided directly above the first buckles (1e) at both ends; The upper shielding surface (2b) is provided with a retaining edge (2e) extending to the left and located in front and rear of the side shielding surface (2c), and a locking groove (2d) is provided on the inner side of each retaining edge (2e); The front and rear ends of the right side of the signal acquisition module (3) are both provided with a slide rail (3h) corresponding to the slide groove (1f) and a second buckle (3g) corresponding to the first buckle (1e); the first buckle (1e) and the corresponding second buckle (3g) are both movable buckles with an inclination, and second lock buckles (3i) corresponding to the first lock buckle (1g) are extended above the second buckles (3g) at both ends; The signal acquisition module protection cover (4) has a boss (4g) extending to the right and located in front of and behind the wire outlet (4f) and corresponding to the retaining edge (2e); The slide groove (1f) is aligned with the corresponding slide rail (3h) and installed to the bottom, the first buckle (1e) is buckled with the corresponding second buckle (3g), and at this time the second lock buckle (3i) is aligned with the corresponding first lock buckle (1g), so that the measurement module (1) and the signal acquisition module (3) are installed and buckled, the signal acquisition module protective cover (4) is installed on the upper part of the signal acquisition module (3), and the measurement module protective cover (2) is installed on the upper part of the measurement module (1), and at this time the lock buckle groove (2d) wraps the second lock buckle (3i) and the first lock buckle (1g) in the aligned state, so that the first buckle (1e) and the corresponding second buckle (3g) cannot be deformed and disengaged to become a dead buckle and cannot be removed, and the boss (4g) is covered by the corresponding retaining edge (2e) so that the signal acquisition module protective cover (4) cannot be removed.

3. The modular DC electric energy meter according to claim 1, characterized in that: Lead sealing nuts (1a) are respectively embedded at the front and rear ends of the upper surface of the measuring module (1); lead sealing screw grooves (2a) corresponding to the lead sealing nuts (1a) are respectively provided at the front and rear ends of the upper shielding surface (2b) of the measuring module protective cover (2); a lead sealing screw (5) inserted into each of the lead sealing screw grooves (2a) is threadedly connected to the corresponding lead sealing nut (1a); and each of the lead sealing screws (5) is covered with a lead sealing cover (6).

4. The modular DC electric energy meter according to claim 1, characterized in that: The signal acquisition module (3) is also provided with a first lead sealing hole (3c) at the front and rear ends of the left side, and the signal acquisition module protective cover (4) is also provided with a second lead sealing hole (4c) corresponding to the first lead sealing hole (3c) at the front and rear ends of the bottom of the left side inner wall. When the signal acquisition module protective cover (4) is installed on the upper part of the signal acquisition module (3), the first lead sealing hole (3c) and the second lead sealing hole (4c) are located in corresponding positions. The first lead sealing hole (3c) and the second lead sealing hole (4c) are lead sealed with a lead sealing tool (103) and installed at a designated position.

5. The modular DC electric energy meter according to claim 1, characterized in that: The signal end interface (1b) is a plug-in type wiring method, and the side shielding surface (2c) shields the plug-out path of the signal end interface (1b).

6. The modular DC electric energy meter according to claim 1, characterized in that: The functional end interface is a fixed interface wiring mode, the functional end interface is composed of a fastening screw (1c) and a wiring port (1d), the fastening screw (1c) is located directly above the wiring port (1d), the wiring port (1d) of the functional end interface is connected to the functional connection line (102), and the upper shielding surface (2b) shields the fastening screw (1c).

7. The modular DC electric energy meter according to claim 1, characterized in that: The second limiting buckle (4b) is a loose buckle.

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