Direct-current guide rail electric energy meter

Abstract

The utility model discloses a direct current guide rail electric energy meter, which relates to the technical field of electrical equipment and comprises a shell, a bottom layer circuit board and a middle layer circuit board. The shell is provided with an accommodating cavity; the bottom layer circuit board is installed at the position, close to the bottom, in the containing cavity, and the two opposite sides of the bottom layer circuit board are each provided with a metering input structure. And the middle-layer circuit board is arranged at the middle position in the accommodating cavity. The electrical gap between the bottom layer circuit board and the middle layer circuit board is larger than or equal to a first preset interval. The insulation performance of the direct current guide rail electric energy meter can be greatly improved, so that the direct current guide rail electric energy meter can meet higher requirements.

Description

Technical Field

[0001] This application relates to the technical field of electrical equipment, and particularly to a DC rail watt-hour meter. Background Art

[0002] As an indispensable part of the power system, the main function of the DC rail watt-hour meter is to accurately measure DC electric energy to ensure the reasonable distribution and efficient utilization of electric energy.

[0003] However, with the continuous development of power technology and the increasing power demand, the traditional DC rail watt-hour meter has become inadequate in some performances.

[0004] Especially in terms of insulation performance, the traditional DC rail watt-hour meter often fails to meet the high-standard working conditions of 4.4 kV AC withstand voltage and 6 kV impulse voltage, posing certain potential hazards to the stable operation of the power system. Summary of the Utility Model

[0005] This application provides a DC rail watt-hour meter, which can greatly improve the insulation performance of the DC rail watt-hour meter, so that the DC rail watt-hour meter can meet higher requirements.

[0006] In a first aspect, this application provides a DC rail watt-hour meter, which includes a housing, a bottom layer circuit board, and a middle layer circuit board.

[0007] The housing has a receiving cavity; the bottom layer circuit board is installed at a position close to the bottom in the receiving cavity, and a metering input structure is respectively arranged on two opposite sides of the bottom layer circuit board; the middle layer circuit board is installed at the middle position in the receiving cavity.

[0008] The electrical clearance between the bottom layer circuit board and the middle layer circuit board is greater than or equal to a first preset distance.

[0009] The above setting can improve the insulation performance of the DC rail watt-hour meter, so that it can meet the 4.4 kV AC withstand voltage and 6 kV impulse voltage as required. A metering input structure is respectively arranged on two opposite sides of the bottom layer circuit board, which can realize the connection of two input circuits. At this time, the current and voltage can be connected together, and two groups of voltage and current are input, which improves the insulation performance design of the DC rail watt-hour meter by one level. The first preset distance can make the electrical clearance between the bottom layer circuit board and the middle layer circuit board larger, further increasing the insulation performance of the DC rail watt-hour meter.

[0010] In some examples, the first preset gap is a, and a ≥ 15.7 mm.

[0011] The size of the first preset gap can be marked as a, and the minimum value of this gap is 15.7 mm, that is, the value of a shall not be less than 15.7 mm. Such a design is to ensure that there is a sufficiently large electrical gap between the underlying circuit board and the middle circuit board to meet specific safety standards and performance requirements. Such a gap size can not only effectively prevent electrical short circuits or other electrical faults, but also ensure the stability and reliability of the circuit board.

[0012] In some examples, the first preset gap is a, and 21.7 mm ≥ a ≥ 15.7 mm.

[0013] The value range of the first preset gap a can further be between 21.7 mm and 15.7 mm, that is, 21.7 mm ≥ a ≥ 15.7 mm. Such a range setting helps to ensure that the electrical gap between the underlying circuit board and the middle circuit board is neither too large to cause material waste nor too small to affect the normal operation of the device. Within this value range, different gap sizes such as 18 mm, 18.7 mm, 19 mm, 20 mm, etc. can also be selected to adapt to different application requirements.

[0014] In some examples, a plurality of first input ports are provided on the first side of the housing, the first input ports communicate with the accommodation cavity, a plurality of second input ports are provided on the second side of the housing, the second input ports communicate with the accommodation cavity, and the first side and the second side are opposite sides.

[0015] The two metering input structures include a first metering input structure and a second metering input structure. The first metering input structure corresponds to the first input port, and the first metering input structure can be connected to a corresponding external wire through the first input port. The second metering input structure corresponds to the second input port, and the second metering input structure can be connected to a corresponding external wire through the second input port.

[0016] The housing can have a plurality of first - type interfaces distributed on one side of the housing, which are called first input ports. These first input ports are connected to the accommodation cavity in the housing through channels, ensuring the flow of electricity. At the same time, a plurality of second - type interfaces, that is, second input ports, are provided on the opposite side of the housing, and are also connected to the accommodation cavity through channels, enabling the two opposite sides of the housing, that is, the first side and the second side, to perform independent electrical inputs respectively.

[0017] This application includes two metering input structures, namely the first metering input structure and the second metering input structure. These two structures correspond to the first input port and the second input port of the housing respectively. Specifically, the first metering input structure corresponds to the first input port and can be connected to an external wire through the first input port to achieve the input and measurement of electric quantity. Similarly, the second metering input structure corresponds to the second input port and is connected to an external wire through the second input port, and can also perform the input and measurement of electric quantity.

[0018] These metering input structures are designed to be able to provide voltage and current inputs to the underlying circuit board. This means that in addition to being able to receive the electric quantity input from an external power source, these structures can also accurately measure the input voltage and current, ensuring the accurate use and monitoring of electric energy.

[0019] In some examples, an auxiliary power supply is provided on the middle layer circuit board, and the auxiliary power supply is provided on the side of the middle layer circuit board facing away from the underlying circuit board.

[0020] The auxiliary power supply is provided at a position on the middle layer circuit board close to the first side of the housing. A power input port is provided on the first side of the housing, and the auxiliary power supply can be connected to a power wire through the power input port.

[0021] The auxiliary power supply is provided at a position on the middle layer circuit board close to the first side of the housing. There is a dedicated opening, namely the power input port, on the first side of the housing, which is used for power access. The auxiliary power supply can be connected to the power wire through this power input port.

[0022] To ensure that the electrical clearance between the power input port and the housing meets the safety specifications, the clearance is set to b, with a specific size of 21.7 mm and an allowable error range of ±3 mm. Such a clearance setting can not only ensure the stable operation of the circuit but also ensure the safety of the operator. It should be noted that the size of this clearance can be adjusted according to actual application requirements to adapt to different usage environments and requirements.

[0023] In some examples, the power input of the power wire is one of 220V alternating current, 24V direct current, 36V direct current, 48V direct current, or 60V direct current.

[0024] The power input of the power wire can be any one of 220V alternating current, 24V direct current, 36V direct current, 48V direct current, or 60V direct current. Such a design can enable the power wire to adapt to different power input requirements, providing great flexibility.

[0025] In some examples, an auxiliary terminal output structure is further provided on the middle - layer circuit board, and the auxiliary terminal output structure is disposed on a side of the middle - layer circuit board facing away from the bottom - layer circuit board.

[0026] The auxiliary terminal output structure is disposed at a position of the middle - layer circuit board close to the second side of the housing. An auxiliary output port is provided on the second side of the housing, and the auxiliary terminal output structure can be connected to an output wire through the auxiliary output port.

[0027] An auxiliary terminal output structure is equipped on the middle - layer circuit board. This structure is arranged at a position on the side of the middle - layer circuit board far from the bottom - layer circuit board.

[0028] The auxiliary terminal output structure is arranged in an area of the middle - layer circuit board adjacent to the second side of the housing. As a whole, an auxiliary output port is opened on the second side of the housing. The establishment of the auxiliary output port is to enable the auxiliary terminal output structure to be smoothly connected to the output wire through the auxiliary output port.

[0029] Regarding the electrical clearance between the auxiliary output port and the second input port (the second input port corresponds to the second metering input structure), its specific dimension is specified as c, that is, c = 21.7mm plus or minus 3mm. The setting of this clearance is a flexible parameter, and the specific value can be adjusted and set according to actual application requirements to ensure that the performance and safety of the circuit meet the predetermined standards.

[0030] In some examples, the auxiliary terminal output structure includes at least one of a pulse output, a clock output, and an RS485 communication port corresponding to a metering input structure.

[0031] Through the above design and layout of the present application, different voltage - level components are effectively isolated in this design solution, thus greatly improving the insulation performance of the DC rail watt - hour meter, enabling it to meet the technical requirements of 4.4kV for AC withstand voltage and 6kV for pulse voltage. It solves the difficult - to - overcome technical problem of low insulation performance in traditional designs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings required for the description of the examples or the prior art. Obviously, the following - described drawings are only some examples of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0033] Figure 1 It is a schematic structural diagram of a DC rail watt - hour meter in an example of the present application;

[0034] Figure 2Schematic top view structure of a DC rail watt-hour meter in an example of this application after hiding two covers;

[0035] Figure 3 Schematic cross-sectional structure of a DC rail watt-hour meter in an example of this application;

[0036] Figure 4 Schematic structure of the first side of a DC rail watt-hour meter with an auxiliary power supply in an example of this application;

[0037] Figure 5 Schematic structure of the second side of a DC rail watt-hour meter with an auxiliary terminal output structure in an example of this application.

[0038] Reference numerals:

[0039] 100, housing; 110, accommodation cavity; 120, first input port; 130, second input port; 140, power input port; 150, auxiliary output port; 160, first cover; 170, second cover; 200, bottom layer circuit board; 210, first metering input structure; 220, second metering input structure; 300, middle layer circuit board; 310, auxiliary power supply; 320, auxiliary terminal output structure; 400, top layer circuit board. Detailed implementation manners

[0040] In order to make the objectives, technical solutions and advantages of this application clearer and more understandable, the following further details this application in conjunction with the accompanying drawings and examples. It should be understood that the specific examples described herein are only used to explain this application and are not used to limit this application.

[0041] To solve the above technical problems, please refer to Figures 1 - 5 As shown, a first aspect of this application proposes a DC rail watt-hour meter, which can greatly improve the insulation performance of the DC rail watt-hour meter, and thus the DC rail watt-hour meter can meet higher requirements.

[0042] Refer to Figures 1 - 5 As shown, in some examples, the DC rail watt-hour meter includes a housing 100, a bottom layer circuit board 200 and a middle layer circuit board 300.

[0043] The housing 100 has an accommodation cavity 110; the bottom layer circuit board 200 is installed at a position close to the bottom inside the accommodation cavity 110, and a metering input structure is provided on each of the opposite sides of the bottom layer circuit board 200; the middle layer circuit board 300 is installed at the middle position inside the accommodation cavity 110.

[0044] The electrical clearance between the bottom layer circuit board 200 and the middle layer circuit board 300 is greater than or equal to a first preset distance.

[0045] The above settings can improve the insulation performance of the DC rail watt-hour meter, and thus can be set as required to meet an AC withstand voltage of 4.4 kV and a pulse voltage of 6 kV. A metering input structure is provided on each of the opposite sides of the bottom layer circuit board 200, which can realize the connection of two input circuits. At this time, the current and voltage can be connected together, and two groups of voltage and current inputs improve the insulation performance design of the DC rail watt-hour meter by one level. The first preset distance can make the electrical clearance between the bottom layer circuit board 200 and the middle layer circuit board 300 larger, further increasing the insulation performance of the DC rail watt-hour meter.

[0046] The DC rail type electric energy can form an integrated system, which is mainly composed of a housing, a bottom layer circuit board 200, and a middle layer circuit board 300 located above the bottom layer circuit board 200. Both the bottom layer circuit board 200 and the middle layer circuit board 300 can be rigid printed circuit boards (PCBs).

[0047] The housing includes an internal space with a specific size and shape, which is used to accommodate internal electronic components. The bottom layer circuit board 200 is installed in the accommodation cavity 110 of the housing, specifically near the bottom of the cavity. Such a layout can ensure that the circuit board is installed adjacent to the bottom, thus leaving more space for the components above. On both sides of the bottom layer circuit board 200, input interfaces for electric energy metering are provided. These metering input structures are the key to accurate electric energy measurement and can access two different power inputs, enabling the current and voltage signals to be accurately synchronously measured.

[0048] The middle layer circuit board 300 is placed in the middle of the housing accommodation cavity 110. This position is selected to ensure the balance and stability of the entire device and also helps to evenly distribute heat. The distance between the two layers of PCBs is designed to be at least equal to a preset minimum distance, which is defined as the first predetermined distance, aiming to ensure sufficient electrical insulation performance to meet specific electrical safety standards.

[0049] To achieve high-standard insulation performance, the device can withstand an AC voltage of up to 4.4 kV and a pulse voltage of up to 6 kV, which is crucial for ensuring the reliability and safety of the device under various grid conditions.

[0050] By providing a metering input structure at each end of the underlying circuit board 200, the electricity meter can simultaneously process current and voltage signals from two different circuits. This design not only improves the flexibility of the device but also greatly enhances its insulation performance. In this configuration, the two sets of current and voltage inputs can be effectively connected and processed, thereby providing a higher safety level for the electricity meter. Additionally, the presence of the first predetermined spacing not only increases the electrical clearance between the underlying and middle circuit boards 300 but also further enhances the insulation ability of the overall device, which is of significant importance for preventing electrical faults and extending the service life of the device.

[0051] In this application Figure 2 shows a top view structural schematic diagram of the DC rail electricity meter with two covers hidden; these two covers are the first cover 160 and the second cover 170 respectively. By combining Figure 1 with Figure 2 , it is possible to Figure 2 view and position these two covers more specifically. From this perspective, the first cover 160 is located below and can thus be regarded as the lower cover, while the second cover 170 is located above and can thus be regarded as the upper cover.

[0052] The setting of the covers can effectively isolate and protect specific areas of the electricity meter. To further improve safety, a lead seal structure is also provided on the covers according to actual needs to ensure the safety of the electricity meter during transportation and storage. Additionally, to prevent non-professionals from accidentally or deliberately opening the covers, relevant protection structures are designed on the covers, which can effectively prevent unauthorized access and ensure the normal operation and service life of the electricity meter.

[0053] Referring to Figure 2 and Figure 3 shown, in some examples, the first preset gap is a, and a ≥ 15.7 mm.

[0054] As described above, the size of the first preset gap can be marked as a, and the minimum value of this gap is 15.7 mm, that is, the value of a shall not be less than 15.7 mm. Such a design is to ensure that there is a sufficiently large electrical clearance between the underlying circuit board 200 and the middle circuit board 300 to meet specific safety standards and performance requirements. Such a gap size can not only effectively prevent electrical short circuits or other electrical faults but also ensure the stability and reliability of the circuit board.

[0055] In addition, different values such as 18mm, 18.7mm, 19mm, 20mm, 21mm, 22mm, 23mm, etc. can also be considered for the gap size. These values are selected based on actual application requirements and specific technical considerations, aiming to provide more flexible design options for different working environments. Therefore, in actual applications, the most suitable gap size can be selected according to specific situations, such as the usage conditions of the device, safety requirements, and costs, etc.

[0056] Referring to Figure 2 and Figure 3 As shown, in some examples, the first preset gap is a, and 21.7mm ≥ a ≥ 15.7mm.

[0057] The value range of the first preset gap a can further be between 21.7mm and 15.7mm, that is, 21.7mm ≥ a ≥ 15.7mm. Such a range setting helps to ensure that the electrical gap between the underlying circuit board 200 and the middle circuit board 300 is neither too large to cause material waste nor too small to affect the normal operation of the device. Within this value range, different gap sizes such as 18mm, 18.7mm, 19mm, 20mm, etc. can also be selected to adapt to different application requirements.

[0058] Generally speaking, for the size of the first preset gap, it should be selected according to actual needs, meeting the requirements in terms of safety, performance, etc., and also considering costs and the usage efficiency of resources.

[0059] Referring to Figure 2 As shown, in some examples, a plurality of first input ports 120 are provided on the first side of the housing 100. The first input ports 120 communicate with the accommodation cavity 110. A plurality of second input ports 130 are provided on the second side of the housing 100. The second input ports 130 communicate with the accommodation cavity 110. The first side and the second side are opposite sides.

[0060] The two metering input structures include a first metering input structure 210 and a second metering input structure 220. The first metering input structure 210 corresponds to the first input port 120. The first metering input structure 210 can be connected to the corresponding external wire through the first input port 120. The second metering input structure 220 corresponds to the second input port 130. The second metering input structure 220 can be connected to the corresponding external wire through the second input port 130.

[0061] The housing 100 may have a plurality of first - type interfaces distributed on one side of the housing 100, which are referred to as the first input ports 120. These first input ports 120 are connected to the accommodation cavity 110 inside the housing 100 through channels, ensuring the electrical circulation. At the same time, a plurality of second - type interfaces, namely the second input ports 130, are provided on the opposite side of the housing 100, which are also connected to the accommodation cavity 110 through channels, enabling the two opposite sides of the housing 100, that is, the first side and the second side, to perform independent electrical inputs respectively.

[0062] This application includes two metering input structures, namely the first metering input structure 210 and the second metering input structure 220. These two structures respectively correspond to the first input port 120 and the second input port 130 of the housing 100. Specifically, the first metering input structure 210 corresponds to the first input port 120 and can be connected to an external wire through the first input port 120 to achieve the input and measurement of electric quantity. Similarly, the second metering input structure 220 corresponds to the second input port 130 and is connected to an external wire through the second input port 130, and can also perform the input and measurement of electric quantity.

[0063] These metering input structures are designed to be able to provide voltage and current inputs to the underlying circuit board 200. This means that in addition to being able to receive the electric quantity input from an external power source, these structures can also accurately measure the input voltage and current, ensuring the accurate use and monitoring of electric energy.

[0064] In some specific cases, the input voltage that the metering input structure can receive is set to 1000V DC. Such a design takes into account the measurement and input requirements of high voltage, ensures that the device can adapt to normal operation in a high - voltage environment, and also provides guarantees for safety and stability.

[0065] Refer to Figure 2 and Figure 3 As shown, in some examples, an auxiliary power supply 310 is provided on the middle - layer circuit board 300, and the auxiliary power supply 310 is provided on the side of the middle - layer circuit board 300 facing away from the underlying circuit board 200.

[0066] The auxiliary power supply 310 is provided at a position on the middle - layer circuit board 300 close to the first side of the housing 100. A power input port 140 is provided on the first side of the housing 100, and the auxiliary power supply 310 can be connected to a power wire through the power input port 140.

[0067] The electrical clearance between the power input port 140 and the first input port 120 (corresponding to the first metering input structure 210) can be b, where b = 21.7mm ± 3mm. It is specifically set according to needs.

[0068] The auxiliary power supply 310 is arranged at a position on the middle - layer circuit board 300 close to the first side of the housing 100. There is a dedicated opening, namely the power input port 140, on the first side of the housing 100, and this port is used for power access. The auxiliary power supply 310 can be connected to the power wire through this power input port 140.

[0069] To ensure that the electrical clearance between the power input port 140 and the housing 100 meets the safety specifications, the clearance is set to b, with a specific dimension of 21.7 mm and an allowable error range of ±3 mm. Such a clearance setting can not only ensure the stable operation of the circuit but also ensure the safety of the operator. It should be noted that the size of this clearance can be adjusted according to the actual application requirements to adapt to different usage environments and requirements.

[0070] In some examples, the power input of the power wire is one of 220V AC, 24V DC, 36V DC, 48V DC, or 60V DC.

[0071] The power input of the power wire in the above - mentioned structure can be any one of 220V AC, 24V DC, 36V DC, 48V DC, or 60V DC. Such a design enables the power wire to adapt to different power input requirements, providing great flexibility.

[0072] In some examples, an auxiliary terminal output structure 320 is also arranged on the middle - layer circuit board 300, and the auxiliary terminal output structure 320 is arranged on the side of the middle - layer circuit board 300 facing away from the bottom - layer circuit board 200.

[0073] The auxiliary terminal output structure 320 is arranged at a position on the middle - layer circuit board 300 close to the second side of the housing 100. There is an auxiliary output port 150 on the second side of the housing 100, and the auxiliary terminal output structure 320 can be connected to the output wire through the auxiliary output port 150.

[0074] The electrical clearance between the auxiliary output port 150 and the second input port 130 (corresponding to the second metering input structure 220) can be c, and c = 21.7 mm ± 3 mm. It is set according to specific needs.

[0075] An auxiliary terminal output structure 320 is equipped on the middle - layer circuit board 300. This structure is arranged at a position on the middle - layer circuit board 300 far from the bottom - layer circuit board 200.

[0076] The auxiliary terminal output structure 320 is arranged in the area of the middle - layer circuit board 300 near the second side of the housing 100. As a whole, the housing 100 has a dedicated auxiliary output port 150 on its second side. The establishment of the auxiliary output port 150 is to enable the auxiliary terminal output structure 320 to be smoothly connected to the output wire through the auxiliary output port 150.

[0077] Regarding the electrical clearance between the auxiliary output port 150 and the second input port 130 (the second input port 130 corresponds to the second metering input structure 220), its specific dimension is specified as c, that is, c = 21.7 mm plus or minus 3 mm. The setting of this clearance is a flexible parameter, and the specific value can be adjusted and set according to the actual application requirements to ensure that the performance and safety of the circuit meet the predetermined standards.

[0078] In some examples, the auxiliary terminal output structure 320 includes at least one of the pulse output, clock output, and RS485 communication port corresponding to the metering input structure. These outputs are all outputs below 40V.

[0079] Through the above - mentioned design and layout of this application, this design scheme has successfully isolated components with different voltage levels, thus greatly improving the insulation performance of the DC rail watt - hour meter, enabling it to meet the technical requirements of AC withstand voltage of 4.4 kV and pulse voltage of 6 kV. It solves the difficult - to - overcome technical problem of low insulation performance in traditional designs.

[0080] By implementing the present invention, not only the safety and reliability of the DC rail watt - hour meter are improved, but also great convenience is provided for users during use.

[0081] The DC rail watt - hour meter further includes a top - layer circuit board 400, and the top - layer circuit board 400 is arranged on the side of the middle - layer circuit board 300 facing away from the bottom - layer circuit board 200.

[0082] The top - layer circuit board 400 is arranged on the side of the middle - layer circuit board 300 facing away from the bottom - layer circuit board 200. This design makes the structure of the watt - hour meter more compact, helps to improve the installation convenience and stability of the watt - hour meter, and further meets the market demand. Various indicator lights and control keys can be set on the top - layer circuit board 400 as needed.

[0083] The above - mentioned DC watt - hour meter of this application has at least two metering inputs. Each metering input includes voltage and current inputs. The voltage of one or more metering inputs is direct current with a nominal value of 1000V. And in the design of a relatively small 4P rail meter, through the cooperation of the structure and the spatial layout of the PCB, at least greater electrical clearance requirements are achieved. It can far meet the electrical clearance requirement of 14 mm.

[0084] The two metering inputs of the DC energy meter are respectively located on the upper and lower sides of the DC rail energy meter (refer to Figure 2 the upper and lower sides in the middle position), and maintain a predetermined electrical clearance from the auxiliary power supply 310 input to ensure the insulation performance between the high-voltage part and the low-voltage part.

[0085] The DC energy meter also includes an auxiliary power supply 310 input, which can be any one of AC 220V or DC 24V, 36V, 48V or 60V, and the electrical clearance from the metering input reaches a predetermined safe distance.

[0086] The DC energy meter also includes auxiliary terminal outputs for outputting two-way metering data, clock data, and RS485 communication signals, and the voltages of these output signals are all lower than 40V, maintaining a sufficient electrical clearance from the high-voltage part.

[0087] Through the design of the multi-layer PCB circuit board, the DC energy meter realizes effective isolation between the high-voltage part and the low-voltage part. The electrical clearance between the bottom-layer circuit board 200 and the middle-layer circuit board 300 is at least 18.7mm, and a deviation of ±3mm is allowed.

[0088] The design of the DC energy meter enables the electrical clearance between one or two metering inputs and the auxiliary power supply 310 to reach or exceed 21.7mm to meet the safety insulation requirements under high-voltage conditions.

[0089] The structural design of the DC energy meter allows for the compactness and functionality of the DC rail energy meter while maintaining sufficient electrical clearance, improving the practicality and reliability of the DC rail energy meter.

[0090] The DC energy meter also includes protective measures to prevent users from accidentally touching the high-voltage part and improve the use safety of the DC rail energy meter.

[0091] This application can design a multi-layer PCB circuit board to achieve effective isolation between the high-voltage part and the low-voltage part; optimize the structure and spatial layout of the DC rail energy meter to meet the predetermined electrical clearance requirements; and add necessary protective measures to improve the use safety of the DC rail energy meter.

[0092] This application can also conduct strict electrical performance tests and insulation performance tests on the DC rail energy meter to ensure that the DC rail energy meter meets the predetermined safety standards and performance requirements.

[0093] The same or similar reference numerals in the accompanying drawings of the present application correspond to the same or similar components; in the description of the present application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present application and simplifying the description, 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, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0094] The above are only the preferred examples of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A DC rail watt-hour meter, characterized in that: The DC rail electric energy meter comprises: A housing having a receiving cavity; A bottom circuit board is installed in the accommodating cavity at a position close to the bottom, and two opposite sides of the bottom circuit board are respectively provided with a metering input structure; A middle circuit board is installed in the middle of the accommodating cavity; The electrical gap between the bottom layer circuit board and the middle layer circuit board is greater than or equal to a first preset distance.

2. The DC rail electric energy meter as described in claim 1, wherein the first preset spacing is a, and a≥15.7 mm.

3. The DC rail electric energy meter as described in claim 2, wherein the first preset distance is a, 21.7 mm ≥ a ≥ 15.7 mm.

4. The DC rail electric energy meter according to claim 1, characterized in that: A first side of the shell is provided with a plurality of first input ports, the first input ports are communicated with the accommodating cavity, a second side of the shell is provided with a plurality of second input ports, the second input ports are communicated with the accommodating cavity, and the first side and the second side are opposite sides; The two metering input structures include a first metering input structure and a second metering input structure, the first metering input structure corresponds to the first input port, and the first metering input structure can be connected to the corresponding external wire through the first input port, and the second metering input structure corresponds to the second input port, and the second metering input structure can be connected to the corresponding external wire through the second input port.

5. The DC rail electric energy meter according to claim 4, characterized in that: The middle layer circuit board is provided with an auxiliary power supply, and the auxiliary power supply is arranged on a side of the middle layer circuit board away from the bottom layer circuit board.

6. The DC rail electric energy meter according to claim 5, characterized in that: The auxiliary power supply is arranged at a position of the middle layer circuit board close to the first side of the shell. The first side of the shell is provided with a power input port, and the auxiliary power supply can be connected to a power wire through the power input port.

7. The DC rail electric energy meter according to claim 6, characterized in that: The power input of the power wire is one of 220V AC, 24V DC, 36V DC, 48V DC or 60V DC.

8. The DC rail electric energy meter according to claim 5, characterized in that: The middle layer circuit board is also provided with an auxiliary terminal output structure, and the auxiliary terminal output structure is arranged on a side of the middle layer circuit board away from the bottom layer circuit board.

9. The DC rail electric energy meter according to claim 8, characterized in that: The auxiliary terminal output structure is arranged on the middle layer circuit board near the second side of the shell, and an auxiliary output port is provided on the second side of the shell. The auxiliary terminal output structure can be connected to the output wire through the auxiliary output port.

10. The DC rail electric energy meter according to claim 8, characterized in that: The auxiliary terminal output structure includes at least one of a pulse output, a clock output and an RS485 communication port corresponding to the metering input structure.

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