A single-phase multi-position metal energy metering box and its installation method

Abstract

This invention discloses a single-phase multi-position metal energy metering box and its installation method, belonging to the field of electrical equipment technology. It includes a box body, a detachable rainproof cover fixed to the top of the box body, a rear wall with a vent, a detachable filter screen installed at the vent, a bottom plate with a drainage area, and a hinged door. The rainproof cover folds downwards around its perimeter to form an annular rainproof section, creating an annular ventilation cavity between it and the top of the box body, achieving top ventilation and rain protection. The vent on the rear wall faces the wall and is located within the projection range of the annular rainproof section. The rear wall is stamped to form an outwardly protruding flow-guiding structure, with downwardly sloping flow-guiding grooves between adjacent protrusions, forming a rear ventilation gap with the wall. The drainage area of ​​the bottom plate has a water collection trough, a drainage hole, and a water-blocking cap. The door has a sealing strip and a flow-guiding groove. This invention, through integrated innovation of the box body structure, systematically solves the problems of rainproofing, heat dissipation, drainage, and filter maintenance of outdoor metering boxes.

Description

Technical Field

[0001] This invention belongs to the field of electrical equipment technology, specifically relating to a single-phase multi-position metal energy metering box and its installation method. Background Technology

[0002] Single-phase multi-position metal energy metering boxes are widely installed in outdoor environments, such as residential communities and rural power grids. Their box structure must meet multiple requirements, including heat dissipation, rain protection, dust protection, and corrosion resistance.

[0003] Various structures of electricity metering boxes have been disclosed in the prior art. For example, patent CN120237546B discloses a modular electricity metering box, which achieves plug-and-play installation of the meter box by setting mounting slots and worm gears, thus improving modular installation and maintenance convenience. In this design, the top of the box is equipped with a rain cap, and a gap is left between the rain cap and the side wall of the box for ventilation, with the vent facing the side; the dust filter is set inside the box, requiring the door to be opened for cleaning or replacement. In addition, the rear wall of the box in this design is a flat structure. When wall-mounted, a small gap inevitably exists between the rear wall and the wall, and rainwater can easily accumulate in it after flowing down the wall. Traditional metering boxes usually only have simple drainage holes at the bottom, lacking structures to prevent external water splashing and the entry of insects and rodents; the seal between the box door and the box body often uses ordinary rubber strips, and water seeping into the door gaps can easily flow into the box body along the door frame, causing water accumulation at the bottom.

[0004] Analysis reveals the following shortcomings in the existing technologies described above:

[0005] 1. In heavy rain and storms, the side vent between the rain cap and the side wall may still allow rainwater to be blown into the enclosure from a slant. Meanwhile, the dust filter is located inside the enclosure, requiring the door to be opened and components disassembled for cleaning or replacement. This cumbersome process often leads to maintenance personnel neglecting to clean it, resulting in filter clogging and heat dissipation failure over time.

[0006] 2. The tiny gap between the rear wall and the wall of the planar structure easily traps rainwater, and a long-term damp environment can lead to rust and perforation of the back panel. At the same time, the air does not circulate in this gap, and heat accumulates at the back of the enclosure, seriously affecting heat dissipation and accelerating the aging of components.

[0007] 3. Condensation caused by temperature differences or accidental water ingress inside the enclosure lacks effective drainage channels, easily accumulating at the bottom. Existing drain holes often lead directly to the outside, allowing rainwater to splash in, and insects and rodents may also enter through the drain holes. Accumulated water not only accelerates the corrosion of the metal enclosure but may also cause electrical short circuits.

[0008] 4. After long-term use, the sealing structure of the existing cabinet door will cause the sealing strip to age or the door panel to deform, allowing rainwater to seep in along the door seams and flow directly into the cabinet, lacking a diversion and drainage mechanism.

[0009] Therefore, how to systematically solve problems such as top ventilation and rain protection, convenient maintenance of the filter, back water accumulation and corrosion prevention, effective bottom drainage and door gap leakage through innovative design of the enclosure structure itself, without adding extra parts or significantly increasing costs, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0010] This invention provides a single-phase multi-position metal energy metering box and its installation method, including a box body, a rainproof cover plate detachably fixed to the top of the box body, a rear wall with a vent, a detachable filter screen plate installed at the vent, a bottom plate with a drainage area, and a hinged box door. Through the integrated innovation of the box body structure, the invention systematically solves the problems of rainproofing, heat dissipation, drainage, and filter maintenance of outdoor metering boxes, thereby addressing the issues raised in the background art.

[0011] To achieve the above objectives, the present invention provides the following technical solution:

[0012] A single-phase multi-position metal energy metering box, comprising:

[0013] The box body has a top cover;

[0014] A rainproof cover is detachably fixed to the top cover. The four edges of the rainproof cover extend downward to form an annular rainproof part surrounding the box body. An annular ventilation cavity is formed between the inner wall of the annular rainproof part and the top outer wall of the box body.

[0015] The rear wall has at least one vent, which faces one side of the wall and is located within the horizontal projection range of the annular rainproof part;

[0016] A filter screen is detachably installed at the air inlet;

[0017] The rear wall is provided with a set of outwardly protruding flow guiding structures, and a downwardly inclined flow guiding groove is formed between adjacent flow guiding structures.

[0018] The base plate has a drainage area, which includes a drainage hole and a water-blocking cap disposed above the drainage hole;

[0019] The door is hinged to the front of the box body, and a sealing strip is provided on the inner side of the door frame. The lower part of the door is provided with a drainage channel for draining leaking water.

[0020] As a further option, the top cover has upward-protruding mounting seats at its four corners, and the rainproof cover is threadedly fixed to the mounting seats by top screws, with an elastic sealing washer pressed under the top screws; the lower edge of the annular rainproof part is inclined and bent inward to form a drip edge.

[0021] As a further option, the filter screen is installed by inserting it from top to bottom; the vent has vertically downward extending slots on both sides; the filter screen includes a frame and a stainless steel filter screen embedded in the frame; the frame has guide strips on both sides that slide with the slots; the rain cover presses down on the top of the filter screen after installation; a cushioning pad is adhered to the top of the frame and makes elastic contact with the inner wall of the rain cover.

[0022] As a further option, the airflow guiding structure includes a vertically extending central ridge and multiple oblique branches symmetrically distributed on both sides of the central ridge, with the airflow guiding grooves formed between adjacent oblique branches; the cross-section of the central ridge is trapezoidal, the angle between the oblique branches and the central ridge is 45° to 60°, and the end of each oblique branch has a rounded transition; the tops of the central ridge and the oblique branches are attached to the wall surface to form a back ventilation gap.

[0023] As a further option, the base plate is also provided with an air inlet louver area, which is located in the front half of the base plate and is covered with a removable insect screen; the drainage area also includes a water collection trough, and the drainage hole is opened at the lowest point of the water collection trough; the water baffle is hemispherical or conical and is welded to the upper surface of the base plate by a support; the base plate is also provided with inlet and outlet cable grooves.

[0024] As a further option, the two side walls of the enclosure are respectively welded with outwardly extending mounting ears. The mounting ears are L-shaped and have fixing holes for fixing to the wall. Reinforcing ribs are welded between the mounting ears and the side walls.

[0025] As a further option, the flow channel of the box door is a V-shaped flow channel, which is formed by bending the edge of the box door multiple times, and has 1 to 3 small drainage holes at its lowest point; the sealing strip is a hollow rubber sealing strip with a trapezoidal cross-section, and the outer edge of the sealing strip protrudes beyond the outer edge of the V-shaped flow channel; when the box door is closed, the vertical edge of the box door presses against the sealing strip.

[0026] As a further option, the rainproof cover is made of 304 stainless steel plate, with its edges extending 35-50mm beyond the top of the box; the central main ridge and the diagonal support ribs have a protrusion height of 4-6mm; and the box body is made of hot-dip galvanized steel plate.

[0027] An installation method for a single-phase multi-position metal energy metering box based on any one of the above-mentioned methods includes the following steps:

[0028] S1: Fix the enclosure to the wall by installing ear plates, so that the top of the air guide structure on the rear wall is in contact with the wall surface, forming a rear ventilation gap;

[0029] S2: Insert the filter screen into the slots on both sides of the air vent from top to bottom, so that the guide strips on both sides of the frame slide into the slots;

[0030] S3: Place the rain cover on the top cover so that the annular rainproof part surrounds the top of the box, and fix the rain cover to the mounting base with the top screws so that the inner wall of the rain cover presses against the top of the filter screen.

[0031] S4: Pass the incoming and outgoing cables through the incoming and outgoing cable slots on the base plate and complete the electrical connection;

[0032] S5: Close the door so that the vertical edge of the door opening presses against the sealing strip on the inside of the door frame.

[0033] As a further option, in S3, before tightening the top screw, an elastic sealing washer needs to be placed under the top screw; a buffer pad is glued to the top of the filter screen frame, and when the rain cover is fixed, the buffer pad makes elastic contact with the inner wall of the rain cover.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] 1. The rainproof cover folds down around its edges to form a ring-shaped rainproof section, creating a ring-shaped ventilation cavity between it and the top of the enclosure, allowing hot air to be evenly discharged from all sides. The vents on the rear wall face the wall and are located within the projection range of the ring-shaped rainproof section, with the wall acting as a natural rain barrier. Together, these features ensure unobstructed heat dissipation from the top while achieving efficient rain protection.

[0036] 2. The front of the bottom plate is equipped with an air inlet louver area. Cold air is drawn into the box from the bottom, absorbs heat and rises, and is discharged through the vent on the upper part of the rear wall to the rear ventilation gap, and then flows upward to the annular ventilation cavity to be discharged to the outside, forming a complete natural convection cycle of "bottom air inlet → internal heat absorption → rear exhaust → top air outlet", which significantly improves heat dissipation efficiency.

[0037] 3. The central ridge and diagonal supports formed by the stamping of the rear wall achieve multiple functions: their tops fit against the wall, forming a through-flow ventilation gap at the back, allowing hot air to flow upwards along the rear wall; downward-sloping guide channels are formed between adjacent protrusions, which can orderly discharge infiltrated rainwater or condensate to both sides, preventing moisture retention; at the same time, this structure enhances the mechanical strength of the rear wall. One structure achieves four functions: support, guidance, drainage, and reinforcement.

[0038] 4. The vent faces the wall and is located within the projection range of the rainproof part, forming double rain protection—external rainwater is first blocked by the annular rainproof part, and a small amount of oblique rainwater is also blocked by the wall and cannot enter the vent. At the same time, the filter screen can be exposed by removing the rainproof cover, so that filter maintenance can be performed without opening the box door.

[0039] 5. The filter screen is installed at the vent using a top-down insertion method, with the top secured by a rainproof cover. Maintenance personnel only need to remove the rainproof cover to pull out the filter screen for cleaning or replacement, without opening the cabinet door or disassembling internal parts. This simple operation helps maintain filter patency over the long term.

[0040] 6. The bottom plate is equipped with a water collection trough, drainage hole, and water-retaining cap. Internal water accumulates along the trough and drains at the lowest point. The water-retaining cap effectively prevents external rainwater from splashing back and insects and rodents from entering. Combined with the V-shaped guide groove and trapezoidal sealing strip on the door, water seeping from the door gaps collects along the guide groove and drains out through a concealed drainage hole, preventing water accumulation inside the box and eliminating the risk of electrical short circuits and metal corrosion.

[0041] 7. The L-shaped mounting ears located on the outside of the enclosure are used for wall mounting. Their mounting holes do not connect to the inside of the enclosure, preventing rainwater from seeping in along the bolts, achieving a fully sealed installation and improving the overall protection level. Attached Figure Description

[0042] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0043] In the attached diagram:

[0044] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0045] Figure 2 This is a schematic diagram of the internal structure of the cabinet door when opened according to the present invention;

[0046] Figure 3 This is a side sectional view of the present invention.

[0047] Figure 4 This is a schematic diagram of the rear view of the housing structure of the present invention;

[0048] Figure 5 This is a schematic diagram of the filter screen structure of the present invention;

[0049] Figure 6 This is a schematic diagram of the filter screen mounting structure of the present invention;

[0050] Figure 7 This is a top view of the base plate structure of the present invention;

[0051] Figure 8 This is a schematic diagram of the water-blocking cap structure of the present invention;

[0052] Figure 9 This is a schematic diagram of the structure of the insect-proof net after installation according to the present invention;

[0053] Figure 10 This is a partial cross-sectional view of the self-drainage structure of the present invention;

[0054] Figure 11 This is a schematic diagram of the method flow of the present invention.

[0055] In the diagram: 100, rainproof cover; 110, annular rain shield; 111, drip edge; 120, annular vent; 130, top screw; 200, enclosure; 210, top cover; 211, mounting base; 220, side wall; 230, rear wall; 240, vent; 241, slot; 242, guide strip; 250, mounting ear plate; 310, central ridge; 320, diagonal support; 324, rounded corner transition; 330 350. Airflow guide channel; 400. Back ventilation gap; 410. Filter screen; 411. Frame; 412. Stainless steel filter screen; 500. Base plate; 520. Air inlet louver area; 521. Insect screen; 530. Cable tray; 540. Drainage area; 541. Water collection trough; 542. Drain hole; 543. Water baffle cap; 600. Box door; 601. Box door; 61. Vertical edge; 610. V-shaped airflow guide channel; 622. Sealing strip. Detailed Implementation

[0056] 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.

[0057] Example 1: Please refer to Figures 1 to 10 This invention provides a single-phase multi-position metal energy metering box. For clarity, the following definitions apply: the side of the metering box closest to the wall after installation is called the rear, the side facing the user is called the front, the vertical direction is called the up-down direction, and the horizontal direction is called the left-right direction. This embodiment includes the following structure:

[0058] 1. Box body and removable rainproof cover

[0059] The electricity metering box of the present invention includes a box body 200 made of a metal plate (preferably hot-dip galvanized steel plate) through cutting, bending and welding. A box door 600 is hinged to the front opening of the box body 200, and an installation beam for fixing multiple single-phase electricity meters is provided inside.

[0060] like Figure 1 , Figure 2 and Figure 3 As shown, the top of the housing 200 is provided with a top cover 210, which is welded and sealed to the side wall 220 of the housing. The top cover 210 has upwardly protruding mounting seats 211 at its four corners. The rainproof cover 100 is detachably fixed to the top cover 210 by multiple top screws 130. Specifically, the mounting seats 211 have pre-drilled threaded holes, and the top screws 130 pass through the through holes on the rainproof cover 100 and are threadedly fixed to the threaded holes.

[0061] To achieve a waterproof seal, the lower pressure pad of screw 130 has an elastic sealing washer located on the rain cover 100, made of silicone or EPDM. When the top screw 130 is tightened, the elastic sealing washer forms a reliable waterproof seal.

[0062] The rainproof cover 100 is a metal plate (preferably 304 stainless steel) with a horizontal projected area larger than that of the top cover 210. The edges of the rainproof cover 100 extend 35-50 mm beyond the top of the box 200. This extended portion is folded downwards vertically to form an annular rainproof portion 110 surrounding the box 200. The lower edge of the annular rainproof portion 110 is further inclined and bent inwards (towards the side wall of the box) to form a drip edge 111. Its function is to make rainwater flowing down the outer wall of the rainproof portion drip at this point, preventing rainwater from climbing up to the inner wall of the rainproof portion.

[0063] The inner wall of the annular rainproof part 110 and the outer wall of the top of the box 200 form a horizontally encircling annular ventilation cavity 120. This annular ventilation cavity 120 is connected to the outside atmosphere and serves as a channel for the exhaust of hot air.

[0064] II. Sealing and installing ear plates

[0065] like Figure 3 As shown, to solve the water leakage problem caused by the opening in the rear wall of traditional wall-mounted installations, mounting ears 250 extending outwards (towards both sides) are welded to the upper and lower ends of the two side walls 220 of the cabinet 200. Each mounting ear 250 is an L-shaped metal plate, with one plane welded and fixed to the side wall 220, and one or more ear plate fixing holes opened on the other plane parallel to the wall. The L-shaped structure facilitates the rearward extension of the ear plate, thus aligning it with the subsequent protrusion of the rear wall of the cabinet. Reinforcing ribs are also welded between the mounting ear 250 and the side wall 220 to increase strength.

[0066] During installation, expansion bolts are used to fix the enclosure 200 to the wall through the mounting holes of the ear plates. Since the mounting ear plates 250 are located entirely outside the enclosure and their mounting holes do not connect to the inside of the enclosure, the possibility of rainwater seeping into the enclosure along the bolts is completely eliminated, achieving a completely sealed installation method.

[0067] III. Rear wall vent and filter plate

[0068] like Figure 4 As shown, the vent 240 of the present invention is located on the upper part of the rear wall 230 of the housing 200. The vent 240 faces the wall and is completely within the horizontal shielding range of the annular rainproof part 110. Since the vent 240 faces the wall, the wall itself becomes a natural windbreak, making it extremely difficult for oblique rainwater to enter the housing from here, thus greatly improving the rainproof performance.

[0069] A removable filter plate 400 is installed at the vent 240 to filter dust from the air entering the housing. The filter plate 400 is installed by inserting it from top to bottom. Specifically, vertically downward extending slots 241 are provided on both sides (inner side of the rear wall) of the vent 240. The lower part of the slot 241 is bent inward to form a bottom stop. Guide strips 242 are provided on both sides of the frame 410 of the filter plate 400 to slide with the slots 241. During installation, the filter plate 400 is inserted into the slots 241 from top to bottom until the bottom.

[0070] The filter screen 400 includes a frame 410 and a stainless steel filter screen 411 embedded in the frame. When the rain cover 100 is installed, the inner wall of the rain cover 100 presses down on the top of the filter screen 400 to prevent it from moving upward due to vibration. As a further option, a buffer pad is glued and fixed to the top of the rotating frame 410 to achieve a buffered and stable contact between the filter screen 400 and the rain cover 100.

[0071] When cleaning the filter screen 400, maintenance personnel only need to unscrew the top screw 130, remove the rain cover 100, and then pull the filter screen 400 upwards. After cleaning and drying, insert it back into its original position and reinstall the rain cover 100. The entire maintenance process does not require opening the cabinet door or disassembling other parts, making the operation simple. This convenient disassembly and cleaning process also ensures stability after easy installation.

[0072] IV. Back-mounted fishbone-style airflow guide system

[0073] like Figure 4 , Figure 5 and Figure 6As shown, the rear wall 230 of the housing 200 is formed by stamping with a mold to create a set of outward (towards the wall side) fishbone-like structures. This structure includes a vertically extending central ridge 310 and multiple oblique ribs 320 symmetrically distributed on both sides of it. The central ridge 310 and all the oblique ribs 320 have the same protrusion height, for example, 4-6 mm.

[0074] Central main ridge 310: Located on the longitudinal central axis of the rear wall 230, extending from the upper part to the lower part of the rear wall. Its cross-section is trapezoidal: the top is flat, and the two sides are inclined planes forming an angle of 15° to 25° with the rear wall plane. This top plane is the main contact surface when the enclosure is installed with the wall. No through holes are opened on the central main ridge 310; it only serves as a support and flow guiding structure.

[0075] Diagonal ribs 320: Multiple diagonal ribs 320 are arranged on both sides of the central main ridge 310 as its axis of symmetry. Each rib is not connected to the central main ridge 310; one end is close to the central main ridge 310, and the other end extends diagonally downwards towards the side wall of the enclosure. The angle between the rib and the central main ridge is 45°–60°. On the same side (e.g., the left side), multiple ribs are arranged from top to bottom, making the entire structure resemble a fishbone—the central main ridge is the fish spine, and the ribs on both sides are the fish bones. This structure ensures uniform stamping deformation of the rear wall and a stable fit with the wall. Each rib has a rounded transition 324 at its end to eliminate stress concentration.

[0076] Flow channel 330: Due to the downward-sloping extension of the ribs and their protrusion above the rear wall plane, a downward-sloping groove, i.e., flow channel 330, is naturally formed between two adjacent ribs. Each long rib forms a flow channel with its adjacent next rib, and the bottom of each flow channel 330 is the original plane of the rear wall 230 (un-stamped area). Because the ribs extend downwards, the bottom of the flow channel 330 naturally exhibits a downward-sloping surface from the central ridge towards the side wall, i.e., the side closer to the central ridge is higher, and the side closer to the side wall is lower. When rainwater or condensate enters between the enclosure and the wall, the water will drain to both sides along the flow channel 330, preventing water accumulation.

[0077] Rear ventilation gap 350: When the enclosure 200 is fixed to the wall via mounting ears 250, the top planes of the central main ridge 310 and all diagonal support ribs 320 are in contact with the wall surface. Since the remaining area of ​​the rear wall 230 (including the bottom of the guide channel) is recessed relative to the top planes of these protrusions, a through rear ventilation gap 350 is naturally formed between the rear wall and the wall, with the gap width equal to the height of the protrusions. This gap extends vertically from the bottom to the top of the enclosure and horizontally through the enclosure, indirectly communicating with the air inlet louver area 520 at the bottom and the annular ventilation cavity 120 at the top, forming a micro-air circulation channel to assist in heat dissipation of the rear wall.

[0078] V. Bottom Drainage System

[0079] like Figure 7 , Figure 8 and Figure 9 As shown, the bottom of the box is provided with a base plate 500, on which an air inlet louver area 520, an inlet / outlet cable tray 530 and a drainage area 540 are installed.

[0080] Air intake louver area 520: Located in the front half of the base plate. This area has multiple louvers, each formed by pressing the base plate material downwards to create blades. The gap between the blades and the base plate serves as the air intake channel. Above the louvers is a removable insect screen 521, made of 40-mesh stainless steel, secured by a frame.

[0081] Cable tray 530: Cable tray 530 is used for subsequent connection of incoming cables. A conventional cable tray can be used, and the cable area should be sealed.

[0082] Drainage area 540: Located on both sides of the rear of the base plate. A water collection trough 541 is stamped at this location on the base plate to collect condensate flowing down from the back of the tank. A drain hole 542 is provided at the lowest point of the water collection trough 541. Above the drain hole 542 (on one side inside the tank), a hemispherical or conical water-retaining cap 543 is provided, welded to the upper surface of the base plate by 2-3 supports. The water-retaining cap 543 prevents external water from splashing into the drain hole, while allowing internal water to flow into the drain hole and drain through the gap between its edge and the base plate.

[0083] VI. Self-draining structure

[0084] like Figure 10 As shown, a hollow rubber sealing strip 622 is pasted on the inner side of the door frame of the box door 600 corresponding to the box door 601. When the box door 600 is closed, the vertical edge 61 around the edge of the box door 601 presses against the sealing strip 622 to achieve a full-circle seal.

[0085] A V-shaped drainage channel 610 is formed by multiple bends on the outer edge of the vertical edge 61. The specific bending sequence is as follows: the edge of the door panel is first bent outward (away from the doorway); then bent inward (towards the cabinet body) to form a V-shaped drainage channel, with the bottom of the channel being the boundary line between the two. At the lower edge of the door 600, drainage holes are provided at the lowest point of the V-shaped drainage channel 610, with a number of 1 to 3 holes; the outer edge of the sealing strip 622 protrudes (the edge is located further outward, so that the upper height is higher than the height of the V-shaped drainage channel, which facilitates water seepage into the V-shaped drainage channel). Preferably, the sealing strip 622 has a trapezoidal cross-section, so that when rainwater seeps in from the door gap, the seepage flows along the bottom of the V-shaped channel and is finally discharged from the cabinet through the concealed drainage holes.

[0086] VII. Overall Work Process

[0087] During use, the metering box of this invention automatically completes heat dissipation, drainage, and filter maintenance according to the following path, or can be conveniently operated by maintenance personnel.

[0088] 1. Heat dissipation circulation path

[0089] Outside cold air is drawn into the housing 200 through the air inlet louvers 520 at the front of the base plate 500. The cold air flows over the surfaces of heating elements such as meters and switches, absorbing heat and heating up. The hot air naturally rises to the upper part of the housing and exits through the vent 240 at the top of the rear wall 230, entering the rear ventilation gap 350 formed between the central main ridge 310, the diagonal support ribs 320, and the wall. This gap is vertically continuous and horizontally connected. The hot air flows upward along the rear ventilation gap and is finally discharged to the outside atmosphere through the annular ventilation cavity 120 between the rainproof cover 100 and the top of the housing 200. The continuous inflow of cold air from the bottom creates a stable natural convection cycle of "bottom air inlet → internal heat absorption → rear exhaust → top exhaust," requiring no additional power.

[0090] 2. Drainage and seepage prevention methods

[0091] Back drainage: When rainwater flows down the wall or condensation occurs inside the enclosure and flows down the rear wall 230, the water enters the gap between the rear wall 230 and the wall. The tops of the central main ridge 310 and the diagonal support 320 are tightly fitted to the wall, while the guide channel 330 formed between adjacent diagonal support 320 is a channel that slopes downward from the center to both sides. The water automatically flows along the guide channel 330 to the left and right sides of the enclosure and is discharged from the bottom sides of the enclosure, preventing water accumulation and corrosion at the back.

[0092] Bottom Drainage: Accidental water ingress or condensation inside the tank collects in a water collection trough 541 at the rear of the bottom plate 500. The water collection trough 541 is concave, with a drain hole 542 at its lowest point. Accumulated water flows along the water collection trough to the drain hole 542. Above the drain hole 542 is a hemispherical or conical water-retaining cap 543, which is welded to the upper surface of the bottom plate 500 via a support. The water-retaining cap 543 allows internal water to flow into the drain hole and drain through the gap between its edge and the bottom plate, while effectively preventing external rainwater splashing and the intrusion of insects and rodents.

[0093] Door drainage: When rainwater seeps in through the gap between the door 600 and the box body 200, it is first blocked by the sealing strip 622 on the inner side of the door frame of the door 600. The sealing strip 622 is a hollow rubber strip with a trapezoidal cross-section. Its outer edge protrudes beyond the outer edge of the V-shaped guide groove 610, guiding the seepage water into the V-shaped guide groove 610. The V-shaped guide groove 610 is formed by multiple bends of the door edge and slopes towards the lowest point along the lower edge of the door frame. After the seepage water collects, it is discharged out of the box through 1 to 3 small drainage holes at the lowest point of the lower edge of the door 600, preventing water accumulation inside the box.

[0094] 3. Filter maintenance operation

[0095] Maintenance personnel do not need to open the enclosure door 600. First, unscrew the top screw 130 and remove the rain cover 100. The filter screen 400 is installed in the slots 241 on both sides of the vent 240 using a top-down insertion method, at which point its top is fully exposed. Simply pull the filter screen 400 upwards to remove the stainless steel filter screen 411 for cleaning or replacement. After cleaning and drying, reinsert the filter screen 400 into the slots 241 from top to bottom until the buffer pad at the top of the frame 410 is flush with the installation position. Replace the rain cover 100 and tighten the top screw 130, so that the inner wall of the rain cover 100 elastically presses the top of the filter screen 400 against the buffer pad. The entire maintenance process does not require opening the enclosure door or disassembling internal electrical components.

[0096] 4. Combined rain protection and ventilation

[0097] In heavy rain, rainwater is first blocked by the rainproof cover 100. The annular rainproof portion 110 around the rainproof cover 100 folds downward, and the drip edge 111 at the bottom edge causes water to drip outward, preventing it from climbing onto the inner wall. The annular ventilation cavity 120 remains unobstructed, allowing hot air to be evenly discharged from all sides. The vent 240 on the rear wall 230 faces one side of the wall and is completely within the horizontal projection range of the annular rainproof portion 110, making the wall a natural rain barrier, making it difficult for rainwater to enter the vent even in windy conditions. This achieves a synergy between top heat dissipation and efficient rain protection.

[0098] VIII. Installation Method

[0099] like Figure 11 As shown, based on the above structural characteristics, follow these steps for detailed operation. Before installation, prepare common tools such as expansion bolts, a spirit level, an electric drill, and a screwdriver, and ensure that the wall surface is flat and dry.

[0100] S1: Box fixing

[0101] The enclosure 200 is fixed to the wall using mounting ears 250. The mounting ears 250 are L-shaped and are welded to the upper and lower ends of the two side walls 220 of the enclosure 200. Each mounting ear 250 has a fixing hole, and reinforcing ribs are welded between the ear and the side wall. The specific operation is as follows:

[0102] Based on the dimensions and installation height of the enclosure 200, mark the positions of the mounting holes for each mounting ear plate 250 on the wall.

[0103] Use an electric drill to drill holes at the marked locations, with the hole depth matching the length of the expansion bolt.

[0104] Lift the housing 200 so that the fixing holes of each mounting ear plate 250 are aligned with the drilled holes on the wall.

[0105] Insert the expansion bolts and tighten them initially, but do not lock them completely.

[0106] Use a spirit level to adjust the horizontal and vertical alignment of the box 200 to ensure that the box is upright.

[0107] After adjustment, fully tighten the expansion bolts to firmly fix the box 200 to the wall.

[0108] During the fixing process, special attention should be paid to ensuring that the top surfaces of the central main ridge 310 and all diagonal support ribs 320 on the rear wall 230 are tightly fitted to the wall surface. Since the extension length of the mounting ear plate 250 matches the height of the raised structure, after the expansion bolts are tightened, the tops of the central main ridge 310 and diagonal support ribs 320 naturally press against the wall, while the remaining area of ​​the rear wall 230 (including the bottom of the guide channel 330) maintains a rear ventilation gap 350 with the wall. The mounting ear plate 250 is completely located outside the enclosure, and its fixing holes do not connect to the interior of the enclosure, thus preventing rainwater from seeping into the enclosure along the bolts and achieving a fully sealed installation.

[0109] S2: Install the filter screen.

[0110] After the housing is fixed in place, install the filter screen 400:

[0111] Remove the filter screen 400 and check whether the stainless steel filter screen 411 inside the frame 410 is intact and undamaged.

[0112] Confirm that there are no foreign objects or deformations in the slots 241 on both sides of the vent 240.

[0113] Align the filter plate 400 with the slot 241 from top to bottom, so that the guide strips 242 on both sides of the frame 410 slide into the slot 241.

[0114] Slowly push the filter plate 400 downwards until its bottom touches the lower end of the slot 241 to reach the stop.

[0115] Check that the filter screen 400 is vertical and not tilted, and ensure that it completely covers the vent 240.

[0116] At this time, the top of the filter screen 400 is exposed above the top cover 210 of the housing and has not yet been fixed.

[0117] S3: Install rainproof cover

[0118] The installation of the rain cover 100 must simultaneously achieve waterproof sealing and tightening of the filter screen 400:

[0119] On the mounting bases 211 at the four corners of the top cover 210, elastic sealing gaskets (silicone or EPDM material) are pre-placed.

[0120] Place the rainproof cover 100 on the top cover 210, so that the annular rainproof part 110 surrounds the top of the box 200, and the drip edge 111 of the lower edge of the annular rainproof part 110 faces downward.

[0121] Adjust the position of the rain cover 100 so that its four edges extend 35-50mm beyond the top of the box 200 and are evenly distributed.

[0122] Pass the top screw 130 through the through hole on the rain cover 100 and align it with the threaded hole of the mounting base 211.

[0123] Place an elastic sealing washer below the top screw 130 (between the upper surface of the rain cover 100 and the screw head).

[0124] Tighten the top screws 130 one by one, but do not tighten them all at once. Tighten them alternately and gradually to make the rain cover 100 press down evenly.

[0125] When the inner wall of the rain cover 100 contacts the buffer pad at the top of the filter screen 400 frame 410, continue to tighten the top screw 130 so that the buffer pad is elastically compressed and the rain cover 100 firmly presses the top of the filter screen 400 to prevent it from moving upward due to vibration.

[0126] Finally, tighten the top screw 130 to compress both the upper and lower elastic sealing washers, forming a reliable waterproof seal.

[0127] After installation, check that the annular vent 120 is unobstructed and free of debris. Once the rain cover 100 is fixed, the filter screen 400 is locked in place, requiring no other fasteners.

[0128] S4: Electrical wiring

[0129] Perform wiring operations for the electrical components inside the box:

[0130] The incoming and outgoing cables are threaded into the enclosure through the cable entry / exit channels 530 on the base plate 500. The cable entry / exit channels 530 can be equipped with knockout holes or a sealed cable entry structure. After the cables are threaded, the gaps should be sealed with sealant or rubber rings to prevent insects and rodents from entering.

[0131] Connect the cables to components such as meters, circuit breakers, and terminals according to the electrical design drawings.

[0132] Ensure that the wiring is secure, the phase sequence is correct, and the grounding is reliable.

[0133] Organize the cables inside the box and secure them with cable ties to prevent them from blocking the vents 240 or the air intake louver area 520.

[0134] Check whether the insect screen 521 covering the air intake louver area 520 at the front of the base plate 500 is securely installed and undamaged. The insect screen 521 is a detachable structure; if it has come loose, it should be tightened again.

[0135] S5: Close the door and check the seal.

[0136] After completing the internal wiring, close the enclosure door 600:

[0137] Clean any debris from the doorway 601 and ensure that the sealing strip 622 is clean and undamaged. The sealing strip 622 is a hollow rubber strip with a trapezoidal cross-section and is attached to the inside of the door frame.

[0138] Slowly close the box door 600, so that the vertical edge 61 around the box door 601 is evenly pressed against the sealing strip 622.

[0139] After hearing the "click" sound of the door lock, confirm that the door is locked. At this time, the vertical edge 61 presses against the sealing strip 622, forming a complete seal.

[0140] Check that the lowest point of the V-shaped drainage channel 610 along the lower edge of the door 600 has 1 to 3 small drainage holes, and ensure that the holes are not blocked by paint or foreign objects.

[0141] From the outside, the gap between the door 600 and the body 200 should be uniform, and the outer edge of the sealing strip 622 should protrude beyond the outer edge of the V-shaped guide groove 610 so as to guide the seepage water into the guide groove.

[0142] Verify after installation

[0143] It is recommended to perform a simple verification after installation:

[0144] Feel the airflow at 120° of the annular ventilation chamber with your hand (you can light an incandescent lamp inside the box or use a hair dryer to simulate a heat source and observe the airflow from the top).

[0145] Sprinkle a small amount of water from the outside of the box onto the door seam and observe whether water flows out of the drainage hole under the V-shaped guide groove 610, and there should be no leakage inside the box.

[0146] Check the drain hole 542 at the rear of the base plate 500. The water cap 543 should be intact. When water is poured upwards from the outside, the water should not splash back into the tank.

[0147] After completing the above steps, the metering box can be put into normal operation. For subsequent maintenance, simply repeat steps S2 and S3 (or just remove and install the rain cover and filter screen), without needing to re-secure the box or disconnect the electrical wiring.

[0148] 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 single phase multi-drag metal electric energy metering box characterized in that, include: The box body (200) has a top cover (210) on its top. A rainproof cover (100) is detachably fixed to the top cover (210). The four edges of the rainproof cover (100) extend downward to form an annular rainproof part (110) surrounding the box body (200). An annular ventilation cavity (120) is formed between the inner wall of the annular rainproof part (110) and the top outer wall of the box body (200). The rear wall (230) has at least one vent (240) on it, the vent (240) facing the wall side and located within the horizontal projection range of the annular rainproof part (110); A filter screen (400) is detachably installed at the vent (240); The rear wall (230) is provided with a set of outwardly protruding flow guiding structures, and a downwardly inclined flow guiding groove (330) is formed between adjacent flow guiding structures. The base plate (500) has a drainage area (540) thereon, the drainage area (540) includes a drainage hole (542) and a water-blocking cap (543) disposed above the drainage hole (542). The door (600) is hinged to the front side of the box body (200), and a sealing strip (622) is provided on the inner side of its door frame. The lower part of the door (600) is provided with a drainage channel for draining seepage water.

2. The single-phase multi-drag metal electric energy metering box according to claim 1, characterized in that, The top cover (210) has four upward-protruding mounting seats (211) at its four corners. The rainproof cover (100) is threadedly connected to the mounting seat (211) by a top screw (130). An elastic sealing gasket is pressed under the top screw (130). The lower edge of the annular rainproof part (110) is bent inward to form a drip edge (111).

3. A single-phase multi-position metal energy metering box according to claim 1, characterized in that, The filter plate (400) is installed by inserting from top to bottom; the air vent (240) has vertically downward extending slots (241) on both sides; the filter plate (400) includes a frame (410) and a stainless steel filter (411) embedded in the frame; the frame (410) has guide strips (242) on both sides that slide with the slots (241); the rain cover (100) is installed and presses down on the top of the filter plate (400); the top of the frame (410) is bonded with a buffer pad that makes elastic contact with the inner wall of the rain cover (100).

4. A single-phase multi-position metal energy metering box according to claim 1, characterized in that, The flow guiding structure includes a vertically extending central ridge (310) and multiple oblique branches (320) symmetrically distributed on both sides of the central ridge (310), with the flow guiding groove (330) formed between adjacent oblique branches (320); the cross section of the central ridge (310) is trapezoidal, the angle between the oblique branches (320) and the central ridge (310) is 45° to 60°, and the end of each oblique branch (320) is provided with a rounded transition (324); the tops of the central ridge (310) and the oblique branches (320) are attached to the wall surface to form a back ventilation gap (350).

5. A single-phase multi-position metal energy metering box according to claim 1, characterized in that, The base plate (500) is also provided with an air inlet louver area (520), which is located in the front half of the base plate (500) and is covered with a removable insect net (521); the drainage area (540) also includes a water collection trough (541), and the drainage hole (542) is opened at the lowest point of the water collection trough (541); the water baffle (543) is hemispherical or conical and is welded to the upper surface of the base plate (500) by a support; the base plate (500) is also provided with an inlet and outlet cable groove (530).

6. A single-phase multi-position metal energy metering box according to claim 1, characterized in that, The two side walls (220) of the housing (200) are respectively welded with outwardly extending mounting ears (250). The mounting ears (250) are L-shaped structures with fixing holes for fixing to the wall. Reinforcing ribs are welded between the mounting ears (250) and the side walls (220).

7. A single-phase multi-position metal energy metering box according to claim 1, characterized in that, The flow channel of the box door (600) is a V-shaped flow channel (610), which is formed by bending the edge of the box door (600) multiple times. It has 1 to 3 drainage holes at its lowest point. The sealing strip (622) is a hollow rubber sealing strip with a trapezoidal cross-section. The outer edge of the sealing strip (622) protrudes from the outer edge of the V-shaped flow channel (610). When the box door (600) is closed, the vertical edge (61) of the box door (601) presses against the sealing strip (622).

8. A single-phase multi-position metal energy metering box according to claim 1, characterized in that, The rainproof cover (100) is made of 304 stainless steel plate, and its four edges extend 35-50mm beyond the top of the box body (200); the central main ridge (310) and the oblique support (320) have a protrusion height of 4-6mm; the box body (200) is made of hot-dip galvanized steel plate.

9. An installation method for a single-phase multi-position metal energy metering box according to any one of claims 1-8, characterized in that, Includes the following steps: S1: Fix the box (200) to the wall by installing the ear plate (250), so that the top of the guide structure on the rear wall (230) is in contact with the wall surface, forming a rear ventilation gap (350). S2: Insert the filter screen (400) into the slots (241) on both sides of the vent (240) from top to bottom, so that the guide strips (242) on both sides of the frame (410) slide into the slots (241); S3: Place the rain cover (100) on the top cover (210), so that the annular rain shield (110) surrounds the top of the box (200), and fix the rain cover (100) on the mounting base (211) with the top screw (130), so that the inner wall of the rain cover (100) presses against the top of the filter screen (400); S4: Pass the incoming and outgoing cables through the incoming and outgoing cable trays (530) on the base plate (500) and complete the electrical connection; S5: Close the box door (600) so that the vertical edge (61) of the box door (601) presses against the sealing strip (622) on the inside of the box door (600) frame.

10. The installation method according to claim 9, characterized in that, In S3, before tightening the top screw (130), an elastic sealing washer needs to be placed under the top screw (130); a buffer pad is glued to the top of the frame (410) of the filter screen (400), and after the rain cover (100) is fixed, the buffer pad is in elastic contact with the inner wall of the rain cover (100).

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