Guide rail type electric energy meter

Abstract

The utility model relates to the technical field of low-voltage electric appliances, and discloses a guide rail type electric energy meter. The guide rail type electric energy meter comprises a current transformer, and the current transformer comprises a coil. The circuit board is located on one side of the current transformer, and the coil is electrically connected with the circuit board; the connector bar assembly comprises a first connector bar and a second connector bar which are formed in a split mode, the two ends of the first connector bar are a first wiring part and a first connecting part respectively, and the first connecting part penetrates through the coil; two ends of the second line bank are respectively a second connecting part and a second wiring part, the second connecting part is connected with one end, away from the first wiring part, of the first connecting part, and the second wiring part is located on one side, away from the circuit board, of the second connecting part. According to the guide rail type electric energy meter, on the premise that the overall size is not increased, the electrical gap between the line bank assembly and the circuit board is increased, and the electrical safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a rail-type electricity meter. Background Art

[0002] The rail-type electricity meter has the advantages of compact structure, small occupied space, and being applicable to narrow installation environments, and has been widely used.

[0003] As Figure 1 shown, the rail-type electricity meter includes a housing 10', a wiring row 30', a current transformer 20', a voltage sampling structure 40', and a circuit board 50' arranged inside the housing 10'. Among them, the wiring row 30' passes through the coil of the current transformer 20', and both ends are respectively connected to the input end and the output end of the external circuit. The coil of the current transformer 20' generates an induced current and is electrically connected to the circuit board 50' to facilitate the circuit board 50' to collect current information. Both ends of the voltage sampling structure 40' are respectively electrically connected to the wiring row 30' and the circuit board 50' to facilitate the circuit board 50' to collect voltage information. The circuit board 50' calculates electric energy based on the current information and the voltage information.

[0004] Since electrical components are arranged on the circuit board 50', the end of the wiring row 30' for connecting to the external circuit needs to maintain a sufficient electrical clearance D from the circuit board 50' to avoid the problem of creepage. Figure 1 For the rail-type electricity meter shown, since the lower end of the wiring row 30' needs to pass through the coil, it is constructed in a flat state, which results in a fixed relative position between the lower end of the wiring row 30' and the circuit board 50'. If the electrical clearance is to be increased, the circuit board 50' needs to be moved to the right, which will cause an increase in the thickness dimension of the rail-type electricity meter.

[0005] This part provides background information related to the present application, and these background information are not necessarily prior art. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a rail-type electricity meter, which can increase the electrical clearance between the wiring row assembly and the circuit board without increasing the overall size, and improve electrical safety.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] A rail-type electricity meter, comprising:

[0009] A current transformer, the current transformer including a coil;

[0010] A circuit board, the circuit board being located on one side of the current transformer, and the coil being electrically connected to the circuit board;

[0011] The terminal block assembly includes a first terminal block and a second terminal block which are separately formed, wherein the two ends of the first terminal block are respectively a first terminal portion and a first connecting portion, and the first connecting portion passes through the coil; the two ends of the second terminal block are respectively a second connecting portion and a second terminal portion, and the second connecting portion is connected to an end of the first connecting portion which is away from the first terminal portion, and the second terminal portion is located on a side of the second connecting portion away from the circuit board.

[0012] As an optional solution, a surface of the first wiring portion facing the circuit board and a surface of the second wiring portion facing the circuit board are arranged coplanarly.

[0013] As an optional solution, the first connection portion is connected to the second connection portion by welding; or

[0014] The first connection portion and the second connection portion are connected via a fastener.

[0015] As an optional solution, the second connecting portion is arranged in parallel with the second wiring portion, and the second wiring row also includes an extension portion, one end of which is connected to the second connecting portion, and the other end extends in a direction away from the circuit board and is connected to the second wiring portion.

[0016] As an optional solution, the first wiring row further includes a U-shaped bending portion, two ends of the U-shaped bending portion are respectively connected to the first wiring portion and the first connecting portion, and the opening faces the circuit board.

[0017] As an optional solution, the guide rail type electric energy meter further includes a voltage sampling component, and two ends of the voltage sampling component are respectively connected to the terminal block assembly and the circuit board;

[0018] The voltage sampling component abuts against the upper surface of the current transformer.

[0019] As an optional solution, the end of the voltage sampling component has a plug-in portion, and the plug-in portion is plug-fitted with the circuit board.

[0020] As an optional solution, the current transformer includes a shell and three coils, and the three coils are all arranged in the shell. The rail-type electric energy meter includes three terminal block assemblies, and each of the first terminal blocks corresponds to passing through the shell and one of the coils.

[0021] As an optional solution, the current transformer further includes a plurality of positioning posts, wherein the positioning posts are arranged on a side of the housing facing the circuit board, and the positioning posts are plug-fitted with the circuit board.

[0022] As an alternative solution, a first wire pressing assembly is provided at the first wiring portion, and the first wire pressing assembly is used to connect an external wire and the first wiring portion; and / or

[0023] A second wire pressing assembly is provided at the second wiring portion, and the second wire pressing assembly is used to connect an external wire and the second wiring portion.

[0024] The beneficial effects of the present utility model are as follows:

[0025] For the rail type electric energy meter of the present utility model, the wiring row assembly includes a first wiring row and a second wiring row. During assembly, first pass the first connection portion of the first wiring row through the coil, and then connect the second connection portion of the second wiring row with the first connection portion. At this time, the second wiring portion for connecting with the external wire of the second wiring row is located on the side of the second connection portion away from the circuit board, so that the electrical clearance between the second wiring portion and the circuit board is increased without the need to move the circuit board away from the current transformer, ensuring the electrical safety performance and maintaining the structural compactness of the rail type electric energy meter; in addition, the second wiring portion is arranged on the side of the second connection portion away from the circuit board, making the space below the current transformer larger, facilitating the layout of other structures of the rail type electric energy meter and being beneficial to further improving the structural compactness of the rail type electric energy meter. Description of the Drawings

[0026] Figure 1 is a cross-sectional view of the rail type electric energy meter provided in the background art at the wiring row;

[0027] Figure 2 is a cross-sectional view of the electric energy meter provided in the specific embodiment of the present utility model at the wiring row;

[0028] Figure 3 is a schematic structural diagram of the cooperation of the current transformer, the wiring row assembly, and the voltage sampling component provided in the specific embodiment of the present utility model.

[0029] In the figure:

[0030] 10′, housing; 20′, current transformer; 30′, wiring row; 40′, voltage sampling structure; 50′, circuit board;

[0031] 10, housing; 11, bottom case; 111, first inlet hole; 112, second inlet hole; 12, upper cover; 121, first avoidance hole; 122, second avoidance hole;

[0032] 20, current transformer; 21, housing; 22, coil; 23, wiring terminal; 24, positioning post;

[0033] 30. Terminal block assembly; 31. First terminal block; 311. First terminal part; 312. First connecting part; 313. U-shaped bending part; 32. Second terminal block; 321. Second terminal part; 322. Second connecting part; 323. Extension part;

[0034] 40. Circuit board;

[0035] 50. Voltage sampling component; 51. Insertion part;

[0036] 60. First wire pressing assembly; 61. First wire pressing frame; 62. First fixing part; 63. First threaded part;

[0037] 70. Second wire pressing assembly; 71. Second wire pressing frame; 72. Second fixing part; 73. Second threaded part. Detailed implementation mode

[0038] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0039] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0040] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal height than the second feature.

[0041] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0042] As Figure 2 and Figure 3 shown, this embodiment provides a rail-type electricity meter. The first direction, the second direction, and the third direction are defined as three mutually perpendicular directions in space. In this embodiment, the first direction is taken as the front-back direction, the second direction is taken as the up-down direction, and the third direction is taken as the left-right direction for illustration. As Figure 2 shown, the electricity meter includes a housing 10, a terminal block assembly 30, a current transformer 20, a voltage sampling component 50, and a circuit board 40. The housing 10 includes a bottom case 11 and an upper cover 12. The bottom case 11 and the upper cover 12 are snap-fitted along the first direction to form an accommodation space. The terminal block assembly 30, the current transformer 20, the voltage sampling component 50, and the circuit board 40 are all arranged in the accommodation space formed by the housing 10.

[0043] As Figure 3 shown, the rail-type electricity meter includes three terminal block assemblies 30. The three terminal block assemblies 30 are arranged at intervals along the third direction (i.e., the left-right direction). Each terminal block assembly 30 extends substantially along the second direction (i.e., the up-down direction). The three terminal block assemblies 30 are respectively used to connect to the three-phase wires of the alternating current. Specifically, both ends of each terminal block assembly 30 are respectively connected to the input wire and the output wire of the corresponding phase of the alternating current.

[0044] Correspondingly, the current transformer 20 includes three coils 22, which are arranged at intervals along the third direction, and each coil 22 is sleeved on a terminal strip assembly 30. The two ends of the coil 22 are electrically connected to the circuit board 40 respectively. After the terminal strip assembly 30 is energized, the coil 22 generates an induced current, and the circuit board 40 calculates the current of the terminal strip assembly 30 by collecting the induced current of the coil 22. Three voltage sampling components 50 are also correspondingly arranged, and one end of each voltage sampling component 50 is correspondingly connected to a terminal strip assembly 30, and the other end is electrically connected to the circuit board 40. The circuit board 40 collects the voltage of the terminal strip assembly 30 of the corresponding phase through the voltage sampling component 50. The circuit board 40 calculates the electric energy through the collected current information and voltage information. In this embodiment, the circuit board 40 is arranged on one side of the current transformer 20 so that the three voltage sampling components 50 can be connected to the circuit board 40. In this embodiment, the circuit board 40 is arranged perpendicular to the first direction and is arranged on the side of the current transformer 20 facing the upper cover 12 along the first direction, that is, the circuit board 40 is arranged on the front side of the current transformer 20.

[0045] Some rail-type electricity meters are constructed in a flat plate state because the coil needs to be passed through the lower end of the terminal block. This results in a fixed relative position between the lower end of the terminal block and the circuit board. If the electrical gap needs to be increased, the circuit board needs to be moved to the right, which will increase the thickness of the rail-type electricity meter.

[0046] In this regard, Figure 2 and Figure 3 As shown, the terminal block assembly 30 includes a first terminal block 31 and a second terminal block 32 which are formed separately. The two ends of the first terminal block 31 are respectively a first wiring portion 311 and a first connecting portion 312. The first wiring portion 311 is used to connect with the wire of the corresponding phase of the alternating current, and the first connecting portion 312 runs through the corresponding coil 22. The two ends of the second terminal block 32 are respectively a second wiring portion 321 and a second connecting portion 322. The second connecting portion 322 is connected to one end of the first connecting portion 312 away from the first wiring portion 311. The second wiring portion 321 is used to connect with the wire of the corresponding phase of the alternating current, and the second wiring portion 321 is located on the side of the second connecting portion 322 away from the circuit board 40.

[0047] In the rail - type electric energy meter of this embodiment, during assembly, first pass the first connection portion 312 of the first wiring row 31 through the coil 22, and then connect the second connection portion 322 of the second wiring row 32 to the first connection portion 312. At this time, the second wiring portion 321 of the second wiring row 32 for connecting to the external wire is located on the side of the second connection portion 322 away from the circuit board 40. Thus, without moving the circuit board 40 away from the current transformer 20, the electrical clearance between the second wiring portion 321 and the circuit board 40 is increased, ensuring the electrical safety performance and maintaining the structural compactness of the rail - type electric energy meter. In addition, the second wiring portion 321 is arranged on the side of the second connection portion 322 away from the circuit board 40, making the space below the current transformer 20 larger, facilitating the layout of other structures of the rail - type electric energy meter and being conducive to further improving the structural compactness of the rail - type electric energy meter.

[0048] In this embodiment, the first connection portion 312 and the second connection portion 322 overlap and are connected by welding. The welding connection method has good connection reliability and will not cause a significant increase in the overall resistance of the wiring row assembly 30. Optionally, before welding the first connection portion 312 and the second connection portion 322, sandwich a silver - based solder sheet between the first connection portion 312 and the second connection portion 322, so as to ensure that the wiring row assembly 30 after welding maintains better electrical conductivity. In this embodiment, the second connection portion 322 overlaps on the side of the first connection portion 312 facing the circuit board 40, so the second wiring row 32 can be positioned with the first connection portion 312 by means of its own step structure, improving the convenience of assembly. Of course, in other embodiments, the first wiring portion 311 can also be fixed by riveting or fastener connection, which is not specifically limited here.

[0049] In this embodiment, as Figure 2 shown, the first wiring portion 311 is located above the coil 22 and is used to connect to the output - end wire of the corresponding phase of the alternating current. The first wiring portion 311 and the first connection portion 312 are parallel to each other and are both perpendicular to the first direction. The second wiring portion 321 is located below the coil 22 and is used to connect to the input - end wire of the alternating current. The second connection portion 322 and the second wiring portion 321 are parallel to each other and are both perpendicular to the first direction. In other embodiments, it can also be set that the first wiring portion 311 is connected to the input - end wire of the corresponding phase of the alternating current, and the second wiring portion 321 is connected to the output - end wire of the corresponding phase of the alternating current. In another embodiment, it can also be set that the first wiring portion 311 is located below the coil 22 and the second wiring portion 321 is located above the coil 22.

[0050] As Figure 2As shown, the first wiring row 31 further includes a U-shaped bending portion 313. The two ends of the U-shaped bending portion 313 are respectively connected to the first wiring portion 311 and the first connecting portion 312, and the opening faces the circuit board 40. In this embodiment, the U-shaped bending portion 313 is recessed in the direction away from the circuit board 40, so that a larger space is formed between the first wiring row 31 and the circuit board 40, which is beneficial to the layout of other components in the rail type electric energy meter and improves the overall structural compactness of the rail type electric energy meter; on the other hand, the electrical clearance between the middle region of the first wiring row 31 and the circuit board 40 is increased, improving the safety performance. In this embodiment, the first wiring portion 311, the U-shaped bending portion 313, and the first connecting portion 312 are integrally formed, and the first wiring row 31 is made of a copper row as a whole.

[0051] As Figure 2 shown, the second wiring row 32 further includes an extension portion 323. One end of the extension portion 323 is connected to the second connecting portion 322, and the other end extends in the first direction away from the circuit board 40 and is connected to the second wiring portion 321. The second wiring row 32 is arranged in this way to make the space below the current transformer 20 larger, so as to facilitate the layout of other structures of the rail type electric energy meter and is beneficial to further improving the structural compactness of the rail type electric energy meter. In this embodiment, the second wiring portion 321, the extension portion 323, and the second connecting portion 322 are integrally formed, and the second wiring row 32 is made of a copper row as a whole.

[0052] As Figure 2 shown, a first wire pressing assembly 60 is provided at the first wiring portion 311, and the first wire pressing assembly 60 is used to connect an external wire and the first wiring portion 311. Specifically, the first wire pressing assembly 60 includes a first wire pressing frame 61, a first fixing member 62, and a first threaded member 63. Among them, the first fixing member 62 is installed on the side of the first wiring portion 311 facing the circuit board 40. The first wire pressing frame 61 sleeves the first wiring portion 311 and the first fixing member 62. The first threaded member 63 sequentially passes through the first wire pressing frame 61 and the first fixing member 62. The first threaded member 63 is threadedly connected to the first wire pressing frame 61, and the first threaded member 63 is rotationally matched with the first fixing member 62. A first wire inlet hole 111 corresponding to the first wire pressing frame 61 is provided on the bottom case 11, and a first avoiding hole 121 corresponding to the first threaded member 63 is provided on the upper cover 12. When installing the wire, the wire extends into the first wiring frame through the first wire inlet hole 111. A tool extends into the housing 21 through the first avoiding hole 121 and rotates the first threaded member 63. The first wire pressing frame 61 moves along the first threaded member 63 and presses the wire against the first wiring portion 311, realizing the connection between the wire and the wiring row assembly 30. Optionally, a serrated anti-slip structure is provided on the side of the first wiring portion 311 facing away from the circuit board 40, thereby improving the connection reliability between the first wiring portion 311 and the wire.

[0053] As Figure 2As shown, a second wire pressing assembly 70 is provided at the second wiring portion 321, and the second wire pressing assembly 70 is used to connect external wires and the second wiring portion 321. Specifically, the second wire pressing assembly 70 includes a second wire pressing frame 71, a second fixing member 72 and a second screw member 73. Among them, the second fixing member 72 is installed on the side of the second wiring portion 321 facing the circuit board 40, the second wire pressing frame 71 is sleeved with the second wiring portion 321 and the second fixing member 72, the second screw member 73 is sequentially penetrated by the second wire pressing frame 71 and the second fixing member 72, the second screw member 73 is threadedly connected with the second wire pressing frame 71, and the second screw member 73 is rotatably matched with the second fixing member 72. A second wire entry hole 112 is provided on the bottom shell 11 corresponding to the second wire pressing frame 71, and a second avoidance hole 122 is provided on the upper cover 12 corresponding to the second screw member 73. When installing the wires, the wires are inserted into the second wiring frame through the second wire entry hole 112, the tool is inserted into the housing 21 through the second avoidance hole 122 and the second screw member 73 is rotated, the second wire pressing frame 71 moves along the second screw member 73 and presses the wires onto the second wiring portion 321, thereby achieving the connection between the wires and the wiring strip assembly 30. Optionally, a sawtooth anti-slip structure is provided on the side of the second wiring portion 321 facing away from the circuit board 40, thereby improving the reliability of the connection between the second wiring portion 321 and the wires.

[0054] like Figure 2 As shown, the first wiring portion 311 is coplanar with the surface of the circuit board 40 and the second wiring portion 321 is coplanar with the surface of the circuit board 40, so that the first crimping assembly 60 and the second crimping assembly 70 can be arranged opposite to each other along the second direction (i.e., the up-down direction), thereby making the size of the entire guide-type electric energy meter in the first direction (i.e., the thickness direction) more compact. It should be noted that by adjusting the depth of the U-shaped bending portion 313 and the length of the extension portion 323, it can be ensured that the surface of the first wiring portion 311 facing the circuit board 40 and the surface of the second wiring portion 321 facing the circuit board 40 are coplanar.

[0055] In this embodiment, Figure 3 As shown, the current transformer 20 further includes a housing 21, and the three coils 22 are all arranged in the housing 21. That is, the current transformer 20 of this embodiment integrates the three coils 22 in one housing 21, which not only improves the convenience of assembling the guide-type circuit board 40, but also reduces the number of housings 21 and makes the coils 22 compactly arranged, thereby further improving the structural compactness of the guide-type electric energy meter.

[0056] like Figure 3As shown, the current transformer 20 further includes a plurality of positioning posts 24. The positioning posts 24 are arranged on the side of the housing 21 facing the circuit board 40. The positioning posts 24 are inserted and matched with the circuit board 40, so as to realize the positioning and installation of the current transformer 20 and the circuit board 40. In this embodiment, three positioning posts 24 are provided on the outer shell 10. The three positioning posts 24 are not collinear, and the three positioning posts 24 form a plane, so as to better realize the positioning with the circuit board 40.

[0057] As Figure 3 shown, three groups of wiring terminals 23 are provided on the housing 21. Each group of wiring terminals 23 includes two. The two ends of the three coils 22 are correspondingly connected to the two wiring terminals 23 in the same group. The wiring terminals 23 are used for electrically connecting with the circuit board 40. In this embodiment, after the circuit board 40 and the current transformer 20 are positioned by the positioning posts 24, the wiring terminals 23 can just realize electrical connection with the circuit board 40. Of course, the wiring terminals 23 and the circuit board 40 can be further fixed by welding to ensure the reliability of the electrical connection. By providing the wiring terminals 23 in this embodiment, the connection between each coil 22 and the circuit board 40 can be conveniently realized, the number of leads inside the outer shell 10 is reduced, and the structure inside the rail-type watt-hour meter is more regular.

[0058] As Figure 2 and Figure 3 shown, the voltage sampling component 50 abuts against the upper surface of the current transformer 20. Specifically, the voltage sampling component 50 abuts against the upper surface of the housing 21. When assembling the rail-type watt-hour meter, first fixedly connect the voltage sampling component 50 with the first wiring row 31. When the first connecting portion 312 of the first wiring row 31 passes through the coil 22, when the voltage sampling component 50 abuts against the housing 21, it means that the first wiring row 31 is installed in place. That is, through the above position setting of the voltage sampling component 50, the installation of the first wiring row 31 is positioned, improving the convenience of assembling the rail-type watt-hour meter. Optionally, the voltage sampling component 50 can be connected to the first wiring row 31 by welding, fastener connection, conductive adhesive bonding, etc., which is not specifically limited here.

[0059] As Figure 2 and Figure 3As shown, the end of the voltage sampling component 50 has a plug-in part 51, and the plug-in part 51 is in plug-in fit with the circuit board 40. Through the cooperation between the plug-in part 51 and the circuit board 40, not only can the installation positions of the circuit board 40 and the current transformer 20 be further positioned, but also the electrical connection between the voltage sampling component 50 and the circuit board 40 can be easily realized. Of course, after the plug-in part 51 is plugged into the circuit board 40, the voltage sampling component 50 and the circuit board 40 can be further fixed by welding to ensure the reliability of the electrical connection. In this embodiment, the end of the plug-in part 51 is configured as an arc shape, so that the plug-in fit with the circuit board 40 can be realized more smoothly, and damage to the plug-in part 51 during the plug-in process can be avoided.

[0060] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. The content of this specification should not be construed as a limitation to the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. Guide rail type electric energy meter, characterized in that, Comprising: A current transformer (20), the current transformer (20) comprising a coil (22); A circuit board (40), the circuit board (40) being located on one side of the current transformer (20), and the coil (22) being electrically connected to the circuit board (40); A terminal block assembly (30), comprising a first terminal block (31) and a second terminal block (32) formed separately. Two ends of the first terminal block (31) are respectively a first connection part (311) and a first connection portion (312), and the first connection portion (312) penetrates through the coil (22); two ends of the second terminal block (32) are respectively a second connection portion (322) and a second connection part (321), the second connection portion (322) is connected to an end of the first connection portion (312) departing from the first connection part (311), and the second connection part (321) is located on a side of the second connection portion (322) away from the circuit board (40).

2. The rail-mounted electric energy meter according to claim 1, characterized in that, Surfaces of the first connection part (311) facing the circuit board (40) and the second connection part (321) facing the circuit board (40) are coplanarly arranged.

3. The guide rail type watt-hour meter according to claim 1, characterized in that The first connection portion (312) and the second connection portion (322) are connected by welding; or The first connection portion (312) and the second connection portion (322) are connected by a fastener.

4. The guide rail type electric energy meter according to claim 1, characterized in that The second connection portion (322) and the second connection part (321) are arranged in parallel, and the second terminal block (32) further comprises an extension portion (323). One end of the extension portion (323) is connected to the second connection portion (322), and the other end extends in a direction away from the circuit board (40) and is connected to the second connection part (321).

5. The rail-mounted watt-hour meter according to claim 1, characterized in that, The first terminal block (31) further comprises a U-shaped bending portion (313), two ends of the U-shaped bending portion (313) are respectively connected to the first connection part (311) and the first connection portion (312), and the opening faces the circuit board (40).

6. The guide rail type electric energy meter according to any one of claims 1-5, characterized in that, The rail-type electricity meter further comprises a voltage sampling component (50), two ends of the voltage sampling component (50) are respectively connected to the terminal block assembly (30) and the circuit board (40); The voltage sampling component (50) abuts against an upper surface of the current transformer (20).

7. The rail-mounted electric energy meter according to claim 6, wherein, An end portion of the voltage sampling component (50) has a plug portion (51), and the plug portion (51) is in plug-in fit with the circuit board (40).

8. The guide-rail type electric energy meter according to any one of claims 1-5, characterized in that The current transformer (20) comprises a housing (21) and three coils (22), and the three coils (22) are all arranged inside the housing (21). The rail-type electricity meter comprises three terminal block assemblies (30), and each first terminal block (31) correspondingly penetrates through the housing (21) and one of the coils (22).

9. The rail type electric energy meter according to claim 8, characterized in that, The current transformer (20) further comprises a plurality of positioning posts (24), the positioning posts (24) are arranged on a side of the housing (21) facing the circuit board (40), and the positioning posts (24) are in plug-in fit with the circuit board (40).

10. The guide rail type electric energy meter according to any one of claims 1-5, characterized in that, A first wire pressing assembly (60) is provided at the first wiring portion (311), and the first wire pressing assembly (60) is used for connecting an external wire and the first wiring portion (311); and / or A second wire pressing assembly (70) is provided at the second wiring portion (321), and the second wire pressing assembly (70) is used for connecting an external wire and the second wiring portion (321).

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