High-precision electric energy metering with anti-harmonic interference

Abstract

The application discloses an anti-harmonic interference high-precision electric energy meter, and relates to the technical field of intelligent measuring instruments, which comprises a metal shielding shell, a glue-free strip quick-mounting butt joint structure, a partition isolation structure and a shielding type heat dissipation structure; the inner wall of the metal shielding shell is sprayed with conductive shielding paint; the metal shielding shell comprises an upper shielding main shell and a lower wiring base shell; the upper shielding main shell is provided with an anti-electromagnetic interference transparent acrylic observation window; the glue-free strip quick-mounting butt joint structure comprises an outwardly protruding dovetail engagement boss and an inwardly recessed dovetail clamping groove; the upper shielding main shell is provided with the dovetail engagement boss on the inner side of the butt joint surface, the lower wiring base shell is provided with the dovetail clamping groove on the butt joint surface, and the glue-free strip quick-mounting butt joint structure fully covers the peripheral butt joint edges of the metal shielding shell; the shielding cavity of the metal shielding shell is completely closed, and the anti-harmonic interference reliability of the electric energy meter is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of intelligent measuring instrument technology, specifically to a high-precision energy meter that resists harmonic interference. Background Technology

[0002] As a core infrastructure device in the field of electricity metering, the accuracy of electricity meters directly affects the fairness of electricity trade settlement, the level of refinement in energy management, and the economic rationality of power grid operation. They are crucial equipment for ensuring the orderly conduct of electricity transactions and efficient energy management. With the continuous deepening of industrial automation and the rapid popularization of new energy power generation and grid connection technologies, nonlinear load devices such as frequency converters, uninterruptible power supplies, rectifiers, new energy inverters, and LED driver power supplies are widely used in various application scenarios such as industrial production sites, large commercial complexes, data centers, and rail transportation. During operation, these devices continuously inject a large number of high-order harmonics into the public power grid, causing severe distortion of the grid voltage and current waveforms. These harmonic interferences can intrude into the electricity meter through multiple paths such as electromagnetic radiation, line conduction, and common-mode crosstalk, directly causing problems such as sampling signal distortion, phase shift, and fluctuation and drift of metering data in the metering module. This significantly reduces the metering accuracy of the electricity meter and can even lead to serious consequences such as metering inaccuracies and electricity settlement disputes, making it difficult to meet the reliability requirements of high-precision electricity metering.

[0003] Currently, most high-precision energy meters on the market focus their technological optimization and R&D on electrical technologies such as internal metering chip selection, metering algorithm upgrades, and improvements to internal signal conditioning circuits. They generally neglect the role of external structural design in suppressing and protecting against harmonic interference, resulting in several unavoidable technical defects in practical applications: First, there are significant shortcomings in the selection of casing materials and shielding structure design. Traditional energy meters often use non-metallic materials such as engineering plastics, or ordinary thin metal materials with limited shielding performance, which cannot effectively block electromagnetic radiation and conduction interference of harmonics. Harmonics can easily penetrate and intrude through weak points such as casing seams and conventional straight-through heat dissipation holes. At the same time, the casing seams are mostly sealed and shielded using conductive rubber strips. However, conductive rubber strips are easily affected by harsh environments such as alternating high and low temperatures, humidity, and dust corrosion in industrial sites, resulting in aging, embrittlement, failure, and high-temperature deformation. This leads to magnetic leakage at the seams and failure of the shielding layer, further significantly weakening the overall anti-harmonic interference capability of the casing. Secondly, the design of the shell docking and fixing structure is unreasonable. Traditional disassembly and assembly methods such as screw fastening are commonly used. The shell assembly and disassembly process is cumbersome and complicated. The efficiency of on-site wiring, instrument calibration, fault repair and other maintenance work is low, which cannot meet the actual use needs of rapid maintenance and efficient repair in industrial sites.

[0004] Therefore, in response to the prominent problems of existing high-precision energy meters, such as insufficient anti-harmonic interference capability, failure of external structural shielding, and inconvenience of operation and maintenance, the current power metering field urgently needs to develop a high-precision energy meter with anti-harmonic interference based on structural optimization. This would systematically solve the technical pain points such as harmonic intrusion, shielding failure, and cumbersome disassembly and assembly from the external structural level, so as to meet the needs of high-precision and high-reliability power metering in complex power grid environments. Summary of the Invention

[0005] The purpose of this invention is to provide a high-precision energy meter that resists harmonic interference, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-precision energy meter with harmonic interference resistance, comprising a metal shielding shell, a quick-connect structure without adhesive strips, a partition isolation structure, and a shielded heat dissipation structure; the inner wall of the metal shielding shell is coated with a thick copper-silver composite conductive shielding paint. The metal shielding housing includes an upper shielding main housing and a lower wiring base housing; The upper shielding main housing is provided with an anti-electromagnetic interference transparent acrylic observation window, and the edge of the observation window is sealed with conductive adhesive strips. The adhesive strip-free quick-connect structure includes a matching external dovetail engagement boss and an internal dovetail slot. The upper shielding main shell has a dovetail interlocking boss on the inner side of the mating surface, the lower wiring base shell has a dovetail slot on the mating surface, and the adhesive strip-free quick-connect structure fully covers the four mating edges of the metal shielding shell. A retaining edge is fixedly connected to the outer side of the dovetail interlocking boss, and a stepped groove is provided on the inner side of the mating surface of the retaining edge. A first insert is fixedly connected to the corner of the adjacent dovetail slot, and the upper end of the first insert is inserted into the corner of the adjacent dovetail interlocking boss. A step plate adapted to fit the stepped groove is fixedly connected to the outside of the dovetail slot; a second insert is fixedly connected to the corner of the adjacent step plate, and the upper end of the second insert is inserted into the corner of the adjacent side. The mating surfaces of the adhesive strip-free quick-connect structure are all coated with thick copper-silver composite conductive shielding paint. Limiting holes are provided on both sides of the upper shielding main housing, and a sealing strip that fits the mating surface of the lower wiring base housing is fixedly sleeved on the outside of the upper shielding main housing; a buckle assembly is embedded in the corresponding limiting hole of the lower wiring base housing.

[0007] As a preferred embodiment of the present invention, the upper surface of the lower wiring base housing is provided with an annular slot adapted to be inserted into the upper shielding main housing; The lower wiring base housing has a first buckle slot on both sides, and a second buckle slot is expanded in the middle of the first buckle slot.

[0008] As a preferred embodiment of the present invention, the buckle assembly includes a plug rod adapted to the insertion and limiting hole; the plug rod is movably inserted into the inner side of the first buckle plate groove; The outer end of the plug rod is fixedly sleeved with two first buckles that fit into the first buckle slot. A second buckle that fits into the plug rod is inserted between the two first buckles. The second buckle fits into the second buckle slot. An elastic anti-loss rope is connected between the second buckle and the outer first buckle.

[0009] As a preferred embodiment of the present invention, the partitioned isolation structure includes a first metal partition and a second metal partition integrally formed with the upper shielding main shell, dividing the interior of the upper shielding main shell into a communication area, a metering area, and a wiring area arranged from top to bottom; the first metal partition is provided between the communication area and the metering area, and the second metal partition is provided between the metering area and the wiring area.

[0010] As a preferred embodiment of the present invention, the wiring area has a built-in anti-interference wiring structure, which includes a sealed wiring cavity in the lower wiring base housing, wiring terminals in the sealed wiring cavity, and waterproof shielded wiring connectors corresponding to the wiring terminals. The sealed wiring cavity is fixedly connected to a grid that separates the wiring terminals; The terminal block includes a connector that penetrates the fixed and sealed wiring cavity, and a cable is fixedly connected between the connector and the lower wiring base housing; the connector adopts an insulating and flame-retardant base and is provided with a heightened insulating isolation baffle. The second metal partition has an embedded wiring connector; the wiring connector includes a cover corresponding to the cover base, and a sealing ring that fits and seals the wiring cavity is fixedly sleeved on the outside of the cover. The inner wall of the sealed wiring cavity is coated with copper-silver composite conductive shielding paint, which is connected to the shielding layer of the metal shielding shell.

[0011] As a preferred technical solution of the present invention, the shielded heat dissipation structure is disposed on both sides of the upper shielded main shell, the shielded heat dissipation structure includes a downwardly inclined multi-fold shielded air duct, the inner wall of the multi-fold shielded air duct is sprayed with copper-silver composite conductive shielding paint, and is integrally connected with the inner wall of the upper shielded main shell; The inner end of the multi-fold shielded air duct is fixedly covered with a high magnetic permeability metal woven shielding mesh, and the edge of the shielding mesh is tightly pressed and connected to the metal wall of the upper shielding main shell.

[0012] As a preferred embodiment of the present invention, the metering area has a built-in metering module with a connecting connector; The multi-fold shielded air duct has a built-in heat-conducting column. The inner end of the heat-conducting column passes through the shielding mesh and is connected to the outer shell of the metering module. The outer end of the heat-conducting column extends out of the multi-fold shielded air duct to achieve heat conduction.

[0013] As a preferred embodiment of the present invention, the bottom of the metal shielding shell is provided with a dedicated grounding terminal made of copper, and the grounding terminal is reliably connected to the metal substrate of the metal shielding shell.

[0014] Compared with the prior art, the beneficial effects of the present invention are: A high-precision energy meter with harmonic interference resistance achieves seamless and continuous conduction between the shielding layers of the upper shielded main shell and the lower wiring base shell. Combined with the magnetic blocking path formed by the double-layer staggered steps, it can completely cut off the straight-line penetration channel of harmonic electromagnetic radiation and ensure the complete closure of the shielding cavity of the metal shielded shell; thus greatly improving the reliability of the energy meter against harmonic interference.

[0015] A high-precision energy meter with harmonic interference resistance features limit holes on both sides of the upper shielding main housing, and a corresponding snap-fit ​​component embedded in the lower wiring base housing. This allows for quick installation and removal of the housing without the need for additional tools, making on-site wiring, calibration, and maintenance operations convenient and fast, and significantly improving maintenance efficiency.

[0016] A high-precision energy meter with harmonic interference resistance allows for basic positioning of the metal shielding housing during the docking and adjustment phase between the upper shielding main housing and the lower wiring base housing. This is achieved by pushing an inner rod through a limiting hole. Before the second buckle plate is inserted, the buckle assembly is in an unlocked state, enabling convenient adjustment of the docking between the upper shielding main housing and the lower wiring base housing at any time, thus improving the flexibility of the docking process.

[0017] A high-precision energy meter with harmonic interference resistance is provided. The upper shielding main shell and the lower wiring base shell are connected by a quick-connect structure without adhesive strips. The matching of the outward dovetail interlocking boss and the inward dovetail groove enables precise positioning assistance of the metal shielding shell. During assembly, the quick-connect structure without adhesive strips automatically guides the alignment, ensuring that the mating surfaces of the metal shielding shell are evenly stressed and without local gaps, resulting in higher positioning accuracy and improved joint shielding airtightness.

[0018] A high-precision energy meter with harmonic interference resistance is provided. The inner wall of the sealed wiring cavity is sprayed with copper-silver composite conductive shielding paint, which is connected to the shielding layer of the metal shielding shell, greatly improving the shielding performance of the wiring links. At the same time, a grid that separates the wiring terminals is fixedly connected inside the sealed wiring cavity, reducing electromagnetic coupling interference between the wiring terminals, constructing a complete harmonic shielding barrier, and improving the purity of the metering signal.

[0019] A high-precision energy meter with harmonic interference resistance can automatically connect the terminals and connectors while the upper shielded main housing and the lower wiring base housing are connected. At the same time, the cover of the housing docking seat and the sealing ring that fits and seals the wiring cavity can effectively protect the terminals, efficiently connect the terminals, greatly improve wiring efficiency and convenience, and simultaneously upgrade the wiring protection performance.

[0020] A high-precision energy meter with harmonic interference resistance features a shielded heat dissipation structure with a downward-sloping multi-fold shielded air duct. This structure does not obstruct the natural convection of hot and cold air and ensures efficient heat dissipation of the casing. Furthermore, the inner wall of the multi-fold shielded air duct is coated with copper-silver composite conductive shielding paint, which is integrally connected with the inner wall of the upper shielded main casing to form a complete equipotential shield. This structurally blocks the penetration and leakage of high-frequency harmonic electromagnetic waves. It achieves dual compatibility of heat dissipation and shielding without weakening the anti-interference capability, thereby improving the stability of the metering module's operating temperature and operational safety.

[0021] A high-precision energy meter with harmonic interference resistance features a multi-fold shielded air duct with a built-in heat-conducting column. The inner end of the heat-conducting column penetrates the shielding mesh and is connected to the outer shell of the metering module. The outer end of the heat-conducting column extends out of the multi-fold shielded air duct, and the inner end of the heat-conducting column contacts the outer shell of the metering module. In this way, the heat generated by the metering module can be preferentially and quickly conducted to the outside through the heat-conducting column, improving the cooling efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the interior of the metal shielding shell of the present invention; Figure 3 This is a schematic diagram of the lower wiring base housing of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of point A; Figure 5 This is a schematic diagram of the dovetail groove of the present invention; Figure 6 This is a schematic diagram of the wiring terminals of the present invention; Figure 7 This is a schematic diagram of the wiring connector of the present invention; Figure 8 This is a schematic diagram of the partitioned isolation structure of the present invention; Figure 9 This is a schematic diagram of the snap-fit ​​assembly of the present invention; Figure 10 This is a schematic diagram of the adhesive strip-free quick-connect structure of the present invention; Figure 11 This is a schematic diagram of the dovetail interlocking boss of the present invention.

[0023] In the picture: 101. Upper shielding main housing; 1011. Observation window; 1012. Limiting hole; 1013. Seal; 102. Lower wiring base housing; 1021. Annular slot; 1022. First snap plate slot; 1023. Second snap plate slot; 201. Dovetail engagement boss; 202. Edge guard; 203. Stepped groove; 301. Dovetail slot; 302. First insert post; 303. Step plate; 304. Second insert post; 4. Buckle assembly; 401. Insert rod; 402. First buckle plate; 403. Second buckle plate; 404. Anti-loss rope; 501. First metal partition; 502. Second metal partition; 6. Anti-interference wiring structure; 601. Sealed wiring cavity; 602. Grille; 603. Connector; 604. Cable; 605. Cover; 606. Sealing ring; 701. Multi-fold shielded air duct; 702. Shielding mesh; 703. Heat-conducting column. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example: Please refer to Figures 1-11 A high-precision energy meter with harmonic interference resistance includes a metal shielding shell, a quick-connect structure without adhesive strips, a partition isolation structure, and a shielded heat dissipation structure. The metal shielding shell is made of cold-rolled steel plate as the base material, and the surface is treated with gray matte electrostatic powder coating. The inner wall of the metal shielding shell is coated with a thick copper-silver composite conductive shielding paint. The metal shielding housing includes an upper shielding main housing 101 and a lower wiring base housing 102; The upper shielding main housing 101 is provided with an anti-electromagnetic interference transparent acrylic observation window 1011, and the edge of the observation window 1011 is sealed with conductive adhesive strips. The adhesive strip-free quick-connect structure includes a matching outwardly convex dovetail engagement boss 201 and an inwardly concave dovetail groove 301; The upper shielding main housing 101 has a dovetail interlocking boss 201 on the inner side of the mating surface, and the lower wiring base housing 102 has a dovetail slot 301 on the mating surface. The quick-connect mating structure without adhesive strips fully covers the mating edges of the metal shielding housing. A retaining edge 202 is fixedly connected to the outer side of the dovetail engagement boss 201, and a stepped groove 203 is provided on the inner side of the mating surface of the retaining edge 202. The corners of adjacent dovetail slots 301 are fixedly connected to a first insert post 302, and the upper end of the first insert post 302 is inserted into the corner of the adjacent dovetail interlocking boss 201. A step plate 303 that fits and fits the stepped groove 203 is fixedly connected to the outside of the dovetail slot 301; a second insert post 304 is fixedly connected to the corner of the adjacent step plate 303, and the upper end of the second insert post 304 is inserted into the corner of the adjacent baffle 202; the second insert post 304 adopts a rounded one-piece bending full-coverage butt joint, with no splicing break at the corner, and the corner butt joint surface is also sprayed with copper silver conductive shielding paint. After splicing, the corner shielding layer is seamlessly connected, eliminating the magnetic leakage points that are most likely to occur at the corner; All mating surfaces of the adhesive strip-free quick-connect structure are coated with a thick copper-silver composite conductive shielding paint. Limiting holes 1012 are provided on both sides of the upper shielding main housing 101. A sealing strip 1013 that fits the mating surface of the lower wiring base housing 102 is fixedly sleeved on the outside of the upper shielding main housing 101. A buckle component 4 is embedded in the lower wiring base housing 102 corresponding to the limiting holes 1012.

[0026] As a preferred technical solution of the present invention, the upper surface of the lower wiring base housing 102 is provided with an annular slot 1021 adapted to be inserted into the upper shielding main housing 101; The lower wiring base housing 102 has a first buckle groove 1022 on both sides, and a second buckle groove 1023 is expanded in the middle of the first buckle groove 1022.

[0027] As a preferred embodiment of the present invention, the buckle assembly 4 includes a plug rod 401 adapted to the insertion limiting hole 1012; the plug rod 401 is movably inserted into the inner side of the first buckle plate groove 1022; The outer end of the insertion rod 401 is fixedly sleeved with two first buckle plates 402 that are adapted to be located in the first buckle plate groove 1022. A second buckle plate 403 adapted to be snapped into the insertion rod 401 is inserted between the two first buckle plates 402. The second buckle plate 403 is adapted to be located in the second buckle plate groove 1023. An elastic anti-loss rope 404 is connected between the second buckle plate 403 and the outer first buckle plate 402.

[0028] As a preferred technical solution of the present invention, the partition isolation structure includes a first metal partition 501 and a second metal partition 502 integrally formed with the upper shielding main housing 101, dividing the interior of the upper shielding main housing 101 into a communication area, a metering area, and a wiring area arranged from top to bottom; the first metal partition 501 is provided between the communication area and the metering area, and the second metal partition 502 is provided between the metering area and the wiring area, and the partition isolation structure only provides a shielded cable threading port.

[0029] As a preferred technical solution of the present invention, the wiring area has a built-in anti-interference wiring structure 6. The anti-interference wiring structure 6 includes a sealed wiring cavity 601 disposed in the lower wiring base housing 102, wiring terminals disposed in the sealed wiring cavity 601, and waterproof shielded wiring connectors corresponding to the wiring terminals. A grid 602 with partitioned wiring terminals is fixedly connected inside the sealed wiring cavity 601; The terminal block includes a connector 603 that penetrates and is fixedly sealed in the wiring cavity 601. A cable 604 is fixedly connected between the connector 603 and the lower wiring base housing 102. The connector 603 adopts an insulating and flame-retardant base and is equipped with a heightened insulating isolation baffle. The second metal partition 502 has an embedded wiring connector; the wiring connector includes a cover 605 corresponding to the cover base 603, and a sealing ring 606 that fits and seals the wiring cavity 601 is fixedly sleeved on the outside of the cover 605. The inner wall of the sealed wiring cavity 601 is coated with copper-silver composite conductive shielding paint, which is connected to the shielding layer of the metal shielding shell.

[0030] As a preferred technical solution of the present invention, a shielded heat dissipation structure is provided on both sides of the upper shielded main shell 101. The shielded heat dissipation structure includes a downwardly inclined multi-fold shielded air duct 701. The inner wall of the multi-fold shielded air duct 701 is sprayed with copper-silver composite conductive shielding paint and is integrally connected with the inner wall of the upper shielded main shell 101. The inner end of the multi-fold shielded air duct 701 is fixedly covered with a high magnetic permeability metal braided shielding mesh 702. The edge of the shielding mesh 702 is tightly pressed and connected to the metal wall of the upper shielding main shell 101. The shielding mesh 702 also retains the function of dust prevention, blocking dust from entering the interior of the metal shielding shell.

[0031] As a preferred embodiment of the present invention, the metering area has a built-in metering module with a connecting connector; The multi-fold shielded air duct 701 has a built-in heat-conducting column 703. The inner end of the heat-conducting column 703 passes through the shielding mesh 702 and is connected to the outer shell of the metering module. The outer end of the heat-conducting column 703 extends out of the multi-fold shielded air duct 701 to achieve heat conduction.

[0032] As a preferred embodiment of the present invention, the bottom of the metal shielding shell is provided with a dedicated grounding terminal made of copper, and the grounding terminal is reliably connected to the metal substrate of the metal shielding shell.

[0033] The working principle of this invention is as follows: The upper shielding main housing 101 and the lower wiring base housing 102 are connected using a quick-connect structure without adhesive strips. The quick-connect structure without adhesive strips includes matching outwardly convex dovetail interlocking bosses 201 and inwardly concave dovetail slots 301, as well as a double-layer staggered stepped magnetic blocking structure formed by the edge 202 being fitted with stepped grooves 203 and stepped plates 303. Combined with the thick copper-silver composite conductive shielding paint sprayed on the mating surface of the quick-connect structure without adhesive strips, the shielding layers of the upper shielding main housing 101 and the lower wiring base housing 102 are seamlessly and continuously conductive. With the magnetic blocking path formed by the double-layer staggered steps, the straight-line penetration channel of harmonic electromagnetic radiation can be completely cut off, ensuring the complete closure of the shielding cavity of the metal shielding housing; thus greatly improving the reliability of the energy meter against harmonic interference.

[0034] The upper shielding main housing 101 has limit holes 1012 through both sides. The lower wiring base housing 102 has a corresponding limit hole 1012 with a snap fastener 4 embedded in it, which enables quick assembly and disassembly of the housing. During assembly, the upper shielding main housing 101 is inserted into the lower wiring base housing 102 through the corresponding annular slot 1021, and the insertion rod 401 is pushed inward so that the insertion rod 401 passes through the limit hole 1012. Then, the insertion rod 401 is engaged by inserting the second buckle plate 403 between the two first buckle plates 402, so that the second buckle plate 403 is embedded in the second buckle plate groove 1023, which automatically locks it. During disassembly, the second buckle plate 403 is pulled out by the anti-loss rope 404, and the insertion rod 401 is moved outward to separate the housing. No additional tools are required, and on-site wiring, calibration, and maintenance operations are convenient and quick, greatly improving maintenance efficiency.

[0035] During the docking and adjustment phase of the upper shielding main housing 101 and the lower wiring base housing 102, the insert rod 401 can be pushed inward to pass through the limiting hole 1012 to complete the basic positioning of the metal shielding housing. Before the second buckle plate 403 is inserted, the buckle assembly 4 is in an unlocked state, which allows for convenient adjustment of the docking between the upper shielding main housing 101 and the lower wiring base housing 102 at any time, thereby improving the docking flexibility.

[0036] The upper shielding main housing 101 and the lower wiring base housing 102 are connected by a quick-connect structure without adhesive strips. Through the matching of the outward dovetail interlocking boss 201 and the inward dovetail slot 301, the metal shielding housing is accurately positioned. During assembly, the quick-connect structure without adhesive strips automatically guides the alignment, ensuring that the mating surfaces of the metal shielding housing are evenly stressed and without local gaps, resulting in higher positioning accuracy and improved joint shielding airtightness.

[0037] The first metal partition 501 and the second metal partition 502 divide the interior of the upper shielding main housing 101 into a communication area, a metering area, and a wiring area arranged from top to bottom. The wiring area has an anti-interference wiring structure 6 built in, which closes the wiring part with the most interference to the bottom wiring area through the anti-interference wiring structure 6 to reduce interference to the metering area above. The anti-interference wiring structure 6 includes a sealed wiring cavity 601 located in the lower wiring base housing 102, wiring terminals located in the sealed wiring cavity 601, and waterproof shielded wiring connectors for the corresponding wiring terminals. The inner wall of the sealed wiring cavity 601 is sprayed with copper-silver composite conductive shielding paint, which is connected to the shielding layer of the metal shielding housing, greatly improving the shielding performance of the wiring link. At the same time, a grid 602 that separates the wiring terminals is fixedly connected in the sealed wiring cavity 601 to reduce electromagnetic coupling interference between the wiring terminals, build a complete harmonic shielding barrier, and improve the purity of the metering signal.

[0038] With the cooperation of the terminals and corresponding waterproof shielded connectors located in the sealed wiring cavity 601, the terminals and connectors can automatically connect while the upper shielded main housing 101 and the lower wiring base housing 102 are connected. At the same time, the cover 605 and the mating seat 603 cover and fit the sealing ring 606 of the sealed wiring cavity 601, thereby effectively protecting the terminals, efficiently connecting the terminals, greatly improving wiring efficiency and convenience, and simultaneously upgrading the wiring protection performance.

[0039] The shielded heat dissipation structure is located on both sides of the upper shielded main housing 101. The shielded heat dissipation structure adopts a downward-sloping multi-fold shielded air duct 701. There is no straight passage between the inside and outside of the upper shielded main housing 101. This does not hinder the natural convection of hot and cold air and ensures efficient heat dissipation of the housing. At the same time, the inner wall of the multi-fold shielded air duct 701 is sprayed with copper-silver composite conductive shielding paint, which is integrated with the inner wall of the upper shielded main housing 101 to form a complete equipotential shield. Structurally, it blocks the penetration and leakage of harmonic high-frequency electromagnetic waves. It achieves dual compatibility of heat dissipation and shielding without weakening the anti-interference capability, and improves the stability of the metering module's operating temperature and the safety of operation.

[0040] The multi-fold shielded air duct 701 has a built-in heat-conducting column 703. The inner end of the heat-conducting column 703 passes through the shielding mesh 702 and is connected to the outer shell of the metering module. The outer end of the heat-conducting column 703 extends out of the multi-fold shielded air duct 701, and the inner end of the heat-conducting column 703 contacts the outer shell of the metering module. In this way, the heat generated by the metering module can be preferentially conducted to the outside through the heat-conducting column 703, thereby improving the cooling efficiency.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-precision energy meter with harmonic interference resistance, comprising a metal shielding housing, a quick-connect structure without adhesive strips, a partitioned isolation structure, and a shielded heat dissipation structure; characterized in that: The inner wall of the metal shielding shell is coated with a thick copper-silver composite conductive shielding paint. The metal shielding housing includes an upper shielding main housing (101) and a lower wiring base housing (102). The upper shielding main housing (101) is provided with an anti-electromagnetic interference transparent acrylic observation window (1011), and the edge of the observation window (1011) is sealed with conductive adhesive strip; The adhesive strip-free quick-connect structure includes a matching outwardly convex dovetail engagement boss (201) and an inwardly concave dovetail groove (301). The upper shielding main housing (101) has a dovetail interlocking boss (201) on the inner side of the mating surface, and the lower wiring base housing (102) has a dovetail slot (301) on the mating surface. The adhesive strip-free quick-connect mating structure fully covers the mating edges of the metal shielding housing. The dovetail engagement boss (201) is fixedly connected to a retaining edge (202) on the outside, and a stepped groove (203) is provided on the inner side of the mating surface of the retaining edge (202). A first insert (302) is fixedly connected to the corner of the adjacent dovetail slot (301), and the upper end of the first insert (302) is inserted into the corner of the adjacent dovetail engagement boss (201); The dovetail slot (301) is fixedly connected to a step plate (303) that is adapted to fit the step groove (203); a second insert (304) is fixedly connected to the corner of the adjacent step plate (303), and the upper end of the second insert (304) is inserted into the corner of the adjacent side (202). The mating surfaces of the adhesive strip-free quick-connect structure are all coated with thick copper-silver composite conductive shielding paint. Limiting holes (1012) are provided on both sides of the upper shielding main housing (101), and a sealing strip (1013) that fits the mating surface of the lower wiring base housing (102) is fixedly sleeved on the outside of the upper shielding main housing (101); a buckle assembly (4) is embedded in the lower wiring base housing (102) corresponding to the limiting holes (1012).

2. The high-precision energy meter with harmonic interference resistance according to claim 1, characterized in that: The upper surface of the lower wiring base housing (102) is provided with an annular slot (1021) adapted to be inserted into the upper shielding main housing (101). The lower wiring base housing (102) has a first buckle groove (1022) on both sides, and a second buckle groove (1023) is expanded in the middle of the first buckle groove (1022).

3. The high-precision energy meter with harmonic interference resistance according to claim 2, characterized in that: The buckle assembly (4) includes a plug rod (401) adapted to the insertion limiting hole (1012); the plug rod (401) is movably inserted into the inner side of the first buckle plate groove (1022). The outer end of the insert rod (401) is fixedly sleeved with two first buckle plates (402) adapted to be in the first buckle plate groove (1022). A second buckle plate (403) adapted to snap the insert rod (401) is inserted between the two first buckle plates (402). The second buckle plate (403) is adapted to be in the second buckle plate groove (1023). An elastic anti-loss rope (404) is connected between the second buckle plate (403) and the outer first buckle plate (402).

4. The high-precision energy meter with harmonic interference resistance according to claim 1, characterized in that: The partition isolation structure includes a first metal partition (501) and a second metal partition (502) integrally formed with the upper shielding main shell (101), dividing the interior of the upper shielding main shell (101) into a communication area, a metering area, and a wiring area arranged from top to bottom; the first metal partition (501) is provided between the communication area and the metering area, and the second metal partition (502) is provided between the metering area and the wiring area.

5. The high-precision energy meter with harmonic interference resistance according to claim 4, characterized in that: The wiring area has a built-in anti-interference wiring structure (6), which includes a sealed wiring cavity (601) in the lower wiring base housing (102), wiring terminals in the sealed wiring cavity (601), and waterproof shielded wiring connectors for the corresponding wiring terminals. The sealed wiring cavity (601) is fixedly connected to a grid (602) that separates the wiring terminals. The terminal block includes a connector (603) that penetrates the fixed and sealed wiring cavity (601), and a cable (604) is fixedly connected between the connector (603) and the lower wiring base housing (102); the connector (603) adopts an insulating flame-retardant base and is provided with a heightened insulating isolation baffle; The second metal partition (502) has an embedded wiring connector; the wiring connector includes a cover (605) corresponding to the cover base (603), and a sealing ring (606) that fits and seals the wiring cavity (601) is fixedly sleeved on the outside of the cover (605). The inner wall of the sealed wiring cavity (601) is coated with copper-silver composite conductive shielding paint, which is connected to the shielding layer of the metal shielding shell.

6. The high-precision energy meter with harmonic interference resistance according to claim 5, characterized in that: The shielded heat dissipation structure is located on both sides of the upper shielded main shell (101). The shielded heat dissipation structure includes a downward-sloping multi-fold shielded air duct (701). The inner wall of the multi-fold shielded air duct (701) is coated with copper-silver composite conductive shielding paint and is integrally connected with the inner wall of the upper shielded main shell (101). The inner end of the multi-fold shielded air duct (701) is fixedly covered with a high magnetic permeability metal woven shielding mesh (702), and the edge of the shielding mesh (702) is tightly pressed and connected to the metal wall of the upper shielding main shell (101).

7. The high-precision energy meter with harmonic interference resistance according to claim 6, characterized in that: The metering area has a built-in metering module with a connection connector; The multi-fold shielded air duct (701) has a built-in heat-conducting column (703). The inner end of the heat-conducting column (703) penetrates through the shielding mesh (702) and is connected to the outer shell of the metering module. The outer end of the heat-conducting column (703) extends out of the multi-fold shielded air duct (701) to achieve heat conduction.

8. The high-precision energy meter with harmonic interference resistance according to claim 1, characterized in that: The bottom of the metal shielding shell is equipped with a dedicated copper grounding terminal, which is reliably connected to the metal substrate of the metal shielding shell.

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