Low-voltage grid-connected cabinet with dustproof and salt spray resistant effect

Abstract

This invention belongs to the field of photovoltaic cabinet technology, specifically a low-voltage grid-connected cabinet with dustproof and salt spray resistance. Addressing the problem that exposed hinges in existing technology are easily corroded and damaged by salt spray, the following solution is proposed: a main frame, a first outer shell, and a second outer shell. Fixed support parts are welded to the four corners of the bottom of the main frame. Rectangular holes one and two are respectively opened at the top and bottom of the front of the second outer shell. The edges of both rectangular holes one and two are stamped inward to form recessed grooves, and sealing strips are fixed to the bottom of both recessed grooves. This invention not only prevents the exposed hinge modules from being easily corroded, but also ensures that after closing, the return spring maintains an inward pulling force on either door one or door two. Even if door one or door two warps or deforms due to thermal expansion and contraction, it remains firmly pressed against the sealing strip, improving the sealing effect.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic cabinet technology, and in particular to a low-voltage grid-connected cabinet with dustproof and salt spray resistance. Background Technology

[0002] As photovoltaic (PV) power generation achieves large-scale development as a clean and renewable energy source, the PV grid-connected cabinet, as the core hub connecting PV systems to the power grid, is becoming increasingly crucial in terms of technological development and application. In the process of smart grid construction, the PV grid-connected cabinet undertakes important responsibilities for power adaptation, data interaction, and collaborative control, and is a key device for achieving efficient access of PV power to the smart grid.

[0003] After the electricity generated by photovoltaic modules is processed, it needs to be calibrated for voltage and frequency and filtered for harmonics through a grid-connected cabinet to ensure that it matches the grid parameters and guarantees the stability and reliability of the power supply. At the same time, the grid-connected cabinet realizes functions such as fault isolation and anti-islanding protection through multiple protection mechanisms, strengthens the grid security defense line, solves the grid adaptation problem caused by high proportion of photovoltaic access, promotes the efficient consumption of photovoltaic energy, and helps to build a safe, efficient and clean power supply system.

[0004] As is well known, coastal and other salt spray environments are prone to corroding the hinges of grid-connected electrical cabinets, leading to cabinet door seal failure, equipment malfunction, and affecting the stability of smart grid access and power supply security. In order to strengthen the power grid security defense line and solve the problem of salt spray corrosion on hinges, a grid-connected electrical cabinet with salt spray resistance is provided. Among them, the salt spray resistance treatment of the hinges is the key to improving the corrosion resistance of the cabinet and ensuring the long-term stable operation of the equipment. Summary of the Invention

[0005] To overcome the aforementioned shortcomings in the prior art, the present invention aims to provide a grid-connected electrical cabinet capable of preventing hinge corrosion by salt spray: This invention provides a low-voltage grid-connected cabinet with dustproof and salt spray resistance, including a main frame, a first outer shell, and a second outer shell. The main frame has fixed support parts welded at the four corners of its bottom. The front of the second outer shell has rectangular holes one and two at the top and bottom ends, respectively. The edges of the first and second rectangular holes are stamped inward to form stamped grooves. Sealing strips are fixed at the bottom of the two stamped grooves. Doors one and two are hinged to the first and second rectangular holes, respectively.

[0006] Hinges are provided on one side of the inner wall of the outer casing, near the stamped recessed groove, between the outer casing and the first and second doors. The hinge module includes a grooved slide rail fixed to the inner wall of the outer casing. A sliding seat is slidably connected in the groove of the grooved slide rail. The sliding seat includes an L-shaped base plate and two parallel arc-shaped hinge rods. The first and second doors are rotatably connected to the ends of the arc-shaped hinge rods.

[0007] Preferably, the first outer shell covers the left and right sides and the rear side of the main frame, and the second outer shell covers the top and bottom surface and the front of the main frame;

[0008] A further feature of this invention is that guide slots are provided on both the upper and lower sides of the L-shaped base plate, and the ends of the two arc-shaped hinge rods away from the L-shaped base plate are fixed with the same vertical hinge shaft. A rotating block is fixed in the middle of the hinge shaft and embedded in and fixed to either the first or second cabinet door. A spring baffle is fixed at the bottom of the groove of the slotted slide rail near the back of the cabinet, and a return spring is fixed between the spring baffle and the L-shaped base plate. A pressing ridge frame is fixed near the edge of the side of the first and second cabinet doors near the interior of the cabinet. The shape and size of the pressing ridge frame are adapted to the size of the sealing strip, so that the sealing strip is covered and pressed tightly against the bottom of the stamped recessed groove to achieve a sealing and waterproof function. The overall distance of the arc-shaped hinge rod from the mounting surface of the hinge module is greater than the width of the stamped recessed groove, and the extension length of the arc-shaped hinge rod is greater than the distance between the inner edge of the pressing ridge frame and the outer edge of the first cabinet door. This allows the opening degree of the first and second cabinet doors to be maximized.

[0009] A further feature of the present invention is that both the first and second cabinet doors are provided with mounting holes that are adapted to the shape of the rotating block near the hinge module, and the rotating block is provided with a hidden slot on the side near the outer side of the cabinet body. A T-shaped pull rod is hinged in the hidden slot, and a reset torsion spring is sleeved on the movable shaft of the T-shaped pull rod.

[0010] A further feature of this invention is that the junction of the first and second outer shells is welded, with the weld fully sealed and ground to eliminate corrosion dead angles. The exposed sides of the first and second outer shells, the first and second doors are all treated with rust prevention. In this embodiment, an epoxy zinc-rich primer with powder coating is applied. The hinge module is made entirely of stainless steel, and all its parts are nickel-plated or have a nano-coating. An exhaust vent is located near the bottom of the second door, and a one-way vent valve is installed inside the vent. This improves the overall weather resistance.

[0011] A further feature of this invention is that the bottom of each of the stamped recessed grooves has multiple contact insertion holes, and a fixed protruding contact angle extending into the contact insertion hole is reserved on the side of the sealing strip near the bottom of the stamped recessed groove. The fixed protruding contact angle and the contact insertion hole form an interference fit. Due to this fitting and fixing method, no glue is needed, which not only facilitates installation but also makes the sealing strip more secure. In addition, the cross-section of the sealing strip is flat, which facilitates production and greatly reduces costs. Furthermore, the sealing strip is not prone to slippage under pressure, resulting in a stable sealing effect.

[0012] A further feature of the present invention is that an observation window is provided in the middle of the first door, and a transparent glass is fixed inside the observation window, with a sealing strip provided on the edge of the transparent glass; a lock body is provided on the outer wall of both the first and second doors away from the hinge module.

[0013] A further feature of this invention is that the bottom of the second outer shell is provided with fan-shaped insertion holes near the four corners, and the fixed support includes fan-shaped corrosion-resistant pads welded to the bottom inner wall of the main frame near the four corners. The bottom end of each fan-shaped corrosion-resistant pad passes through the fan-shaped insertion hole, and the same L-shaped support foot is fixed to the two right-angled surfaces of the fan-shaped corrosion-resistant pad located at the bottom of the cabinet. The outer side of the L-shaped support foot is flush with the outer wall of the cabinet. The upper surface of each fan-shaped corrosion-resistant pad is provided with strip-shaped perforations, and anchor bolts are inserted into each strip-shaped perforation. The top of each anchor bolt is provided with an anti-loosening washer. Tighten the nuts and rubber caps. The inner circumference of the rubber cap has an anti-loosening ring near the bottom opening that matches the edge of the anti-loosening washer. During installation, after the nuts are tightened, apply a small ring of foam adhesive to the anti-loosening ring of the rubber cap. This seals the area and acts as an adhesive. Then, attach the cap to the anti-loosening washer to prevent the nuts from rusting. After all the anchor bolts are installed, squeeze the foam adhesive from the bottom of the cabinet towards the lower surface of the fan-shaped corrosion-resistant pad near the strip-shaped perforation until the hole is filled. This will protect the exposed anchor bolts.

[0014] A further feature of this invention is that a circular hole is provided near the center of the bottom of the second outer casing, and an anti-corrosion ring is welded into the circular hole. The anti-corrosion ring has an overall flared tube structure with the opening facing downwards, and an anti-detachment and outward curling edge is reserved near the top of the outer circumference of the anti-corrosion ring. The anti-corrosion ring can pass through the incoming and outgoing cables, and the same waterproof rubber band is sleeved between the outer circumference of the anti-corrosion ring and the outer walls of all incoming and outgoing cables. A first tightening rope and a second tightening rope are respectively wrapped around the outer circumference of the waterproof rubber band near the anti-detachment and outward curling edge. After being tied, foam glue is filled into the gaps.

[0015] A further feature of this invention is that the left and right sides of the outer casing are respectively provided with symmetrical side mounting holes near the center, and each side mounting hole is fitted with an inwardly recessed rainproof recess. The longitudinal section of the rainproof recess is a right trapezoid, and the right angle side of the right trapezoid is located at the top. The top of the rainproof recess is provided with multiple air inlets, and the top of the air inlets is provided with a dehumidification box, which can ventilate and dehumidify the internal moisture when the humidity reaches the required dehumidification level.

[0016] A further feature of this invention is that two horizontal intermediate frames are fixed between the four vertical rods of the main frame, and the dehumidification box is fixed on the intermediate frame near the top. The dehumidification box includes a cuboid shell fixed to the lower surface of the intermediate frames, and the cuboid shell is placed horizontally. A side baffle is fixed at one end of the cuboid shell opening. A heater is fixed at the end of the cuboid shell away from the side baffle, and three parallel electric heating rods are reserved on the side of the heater to extend horizontally into the dehumidification box. A first air guide plate and a second L-shaped air guide plate are also fixed inside the cuboid shell to separate the three electric heating rods. Two fans are embedded on the side of the cuboid shell near the cabinet. The first air guide plate and the second L-shaped air guide plate divide the interior into an S-shape, forcing the airflow to enter from the bottom and pass through the three electric heating rods before exiting from the fans, thus effectively removing moisture.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. By using a hinge module installed inside the cabinet, along with a stamped recessed groove and sealing strip, the traditional exposed hinge module is transformed into an internally concealed one. This not only prevents the exposed hinge module from being easily corroded, but also ensures that after closing, the return spring maintains an inward pulling force on either door one or door two. Even if door one or door two warps or deforms due to thermal expansion and contraction, it will remain firmly pressed against the sealing strip, helping to permanently guarantee the sealing effect at that location.

[0019] 2. By setting a T-shaped pull rod that is hinged to the rotating block, when you need to open the door, simply pull the T-shaped pull rod outward until the entire position of the hinge axis is pulled out of the front of the cabinet, and then you can open the door. This can avoid hurting your fingers by prying open the door gap, and also avoid damaging the anti-rust layer on the door edge by forcibly opening the door, thus affecting its salt spray resistance.

[0020] 3. By setting up anti-corrosion rings with a small top diameter and a large bottom diameter, combined with waterproof rubber bands wrapped around the outside and foam sealant in the gaps, a reverse slope can be formed. This not only prevents insects and ants from crawling in, but also effectively isolates moisture and provides a moisture-proof function. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a low-voltage grid-connected cabinet with dustproof and salt spray resistance as proposed in this invention, after the cabinet door is opened.

[0022] Figure 2 This is a bottom-view three-dimensional structural diagram of a low-voltage grid-connected cabinet with dustproof and salt spray resistance proposed in this invention;

[0023] Figure 3 This is a schematic diagram of the overall structure of a low-voltage grid-connected cabinet with dustproof and salt spray resistance proposed in this invention after it is shut down.

[0024] Figure 4 This is a side view of a low-voltage grid-connected cabinet with dustproof and salt spray resistance proposed in this invention;

[0025] Figure 5 This invention proposes a low-voltage grid-connected cabinet with dustproof and salt spray resistance. Figure 4 Schematic diagram of the cross-sectional structure along line AA;

[0026] Figure 6 This is a schematic diagram of the overall structure of the hinge module in a low-voltage grid-connected cabinet with dustproof and salt spray resistance proposed in this invention.

[0027] Figure 7 This is an assembly drawing of the sliding seat and rotating block in a low-voltage grid-connected cabinet with dustproof and salt spray resistance, as proposed in this invention.

[0028] Figure 8 This is an exploded view of a low-voltage grid-connected cabinet with dustproof and salt spray resistance proposed in this invention.

[0029] Figure 9 This is an exploded view of the anti-corrosion ring at the bottom of a low-voltage grid-connected cabinet with dustproof and salt spray resistance proposed in this invention.

[0030] Figure 10 This is an exploded view of the anchor bolts in a low-voltage grid-connected cabinet with dustproof and salt spray resistance proposed in this invention.

[0031] Figure 11 This is an exploded view of the dehumidification box in a low-voltage grid-connected cabinet with dustproof and salt spray resistance, as proposed in this invention.

[0032] In the diagram: 1. Outer shell 1; 101. Side mounting hole; 2. Dehumidifier box; 201. Rectangular outer shell; 202. Fan; 203. Air guide plate 1; 204. Side baffle; 205. L-shaped air guide plate 2; 206. Heating rod; 3. Outer shell 2; 301. Stamped recessed groove; 302. Contact insertion hole; 303. Round hole; 304. Fan-shaped insertion hole; 4. Sealing strip; 401. Fixed protruding contact; 5. Hinge module; 501. Slotted slide rail; 502. Sliding seat; 503. Spring baffle 1; 504. Return spring; 505. T-shaped pull rod 506. Rotating block; 507. Hinge shaft; 508. Guide slot; 6. Pressing convex frame; 7. Door 1; 8. Lock body; 9. Door 2; 10. Vent hole; 11. Anchor bolt; 12. L-shaped support foot; 13. Rainproof recess; 131. Air inlet; 14. Fan-shaped corrosion-resistant pad; 15. Main frame; 16. Inlet and outlet cables; 17. Corrosion-resistant ring; 171. Anti-detachment outward curling edge; 18. Waterproof rubber belt ring; 19. Intermediate frame; 20. Tensioning rope 1; 21. Tensioning rope 2; 22. Rubber cap; 23. Anti-detachment pad. Detailed Implementation

[0033] The technical solutions 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.

[0034] In this embodiment, refer to Figures 1-11 A low-voltage grid-connected cabinet with dustproof and salt spray resistance includes a main frame 15 with an overall vertical cabinet frame structure, an outer shell 1 and an outer shell 2 3. The bottom corners of the main frame 15 are welded with fixed support parts that extend out of the bottom surface. The front of the outer shell 2 3 has rectangular holes 1 and 2 at the top and bottom ends respectively. The edges of rectangular holes 1 and 2 are punched inward to form punched grooves 301. The bottom of the two punched grooves 301 are fixed with sealing strips 4. The rectangular holes 1 and 2 are respectively hinged with cabinet doors 7 and 9.

[0035] Hinges 5 are provided on one side of the inner wall of the outer casing 1 near the stamped recessed groove 301 and between the door 7 and the second door 9. The hinge module 5 includes a grooved slide rail 501 fixed to the inner wall of the outer casing 1. A sliding seat 502 is slidably connected in the groove of the grooved slide rail 501. The sliding direction of the sliding seat 502 is against the right side wall of the cabinet and parallel to the ground. The sliding seat 502 includes an L-shaped base plate and two parallel arc-shaped hinge rods. The door 7 and the second door 9 are rotatably connected to the ends of the arc-shaped hinge rods.

[0036] In this invention, outer shell 1 wraps around the left and right sides and the rear side of the main frame 15, and outer shell 3 wraps around the top and bottom surface and the front of the main frame 15.

[0037] The L-shaped base plate has guide slots 508 on both the top and bottom sides, and the ends of the two arc-shaped hinge rods away from the L-shaped base plate are fixed with the same vertical hinge shaft 507. A rotating block 506 is fixed in the middle of the hinge shaft 507 and embedded in and fixed to either the first door 7 or the second door 9. A spring baffle 503 is fixed to the bottom of the groove of the slotted slide rail 501 near the back of the cabinet, and a return spring 504 is fixed between the spring baffle 503 and the L-shaped base plate. The slide rail is constructed inside the cabinet. The hinge module 5, in conjunction with the stamped recessed groove 301 and the sealing strip 4, transforms the traditional exposed hinge module 5 into an internally concealed one. This not only prevents the exposed hinge module 5 from being easily corroded, but also ensures that after closing, the return spring 504 pulls the door 7 or door 9 inwards, so that even if the door 7 or door 9 warps or deforms due to thermal expansion and contraction, it can still be pressed tightly against the sealing strip 4, helping to permanently guarantee the sealing effect at that point.

[0038] Reference Figure 1, Figure 5 and Figure 8 Both cabinet doors 7 and 9 have a pressing ridge frame 6 fixed near the edge of the cabinet interior. The shape and size of the pressing ridge frame 6 are adapted to the size of the sealing strip 4, so that the sealing strip 4 can be wrapped and pressed tightly against the bottom of the stamped recessed groove 301 to achieve a sealing and waterproof function. The overall distance of the arc-shaped hinge rod from the mounting surface of the hinge module 5 is greater than the width of the stamped recessed groove 301, and the extension length of the arc-shaped hinge rod is greater than the distance between the inner edge of the pressing ridge frame 6 and the outer edge of cabinet door 7. This allows the opening degree of cabinet door 7 and cabinet door 9 to be maximized.

[0039] Reference Figure 6 and Figure 7 Both cabinet doors 7 and 9 have mounting holes near the hinge module 5 that match the shape of the rotating block 506. The rotating block 506 has a hidden slot on its outer side near the cabinet body, and a T-shaped pull rod 505 is hinged in each hidden slot. A return torsion spring is sleeved on the movable shaft of the T-shaped pull rod 505. By setting the T-shaped pull rod 505 hinged to the rotating block 506, when the door needs to be opened, simply pull the T-shaped pull rod 505 outwards. This will move the side of cabinet door 7 near the hinge shaft 507 outwards until the entire hinge shaft 507 is pulled out of the front of the cabinet. This increases the space between the edge of cabinet door 7 and the cabinet body, allowing cabinet door 7 to rotate smoothly. Then, the door can be opened. This avoids damaging fingers by prying open the door and prevents the anti-rust layer on the door edge from being worn down by forcibly opening the door, thus affecting its salt spray resistance.

[0040] Reference Figure 1 and Figure 2The junction of outer shell 1 and outer shell 2 3 adopts a welding connection process. During construction, full welding is strictly performed to ensure that the weld is complete without any breaks or omissions. After welding, the weld is fully sealed and polished to make the weld surface smooth and flat with the body of the casing, completely eliminating gaps, sharp corners and other corrosion dead angles at the connection, and preventing rust problems caused by moisture and impurities from the source. To further improve the corrosion resistance, all exposed surfaces of outer shell 1, outer shell 2 3, door 1 7 and door 2 9 are professionally rust-proofed. In this embodiment, a double protection process of epoxy zinc-rich primer and powder coating is used, which has excellent rust prevention, wear resistance and UV resistance. The hinge module 5 is made of stainless steel, and all its parts are additionally nickel-plated or nano-coated for protection, effectively enhancing the hinge's corrosion resistance and aging resistance. In addition, an exhaust vent 10 is located near the bottom of the front of the second door 9. The exhaust vent 10 has a built-in one-way valve to promptly expel humid gases from inside the casing, preventing condensation and damage to components. Through these structural designs and process treatments, the overall weather resistance of the equipment is significantly improved, enabling it to adapt to various complex and harsh operating environments and extending its service life.

[0041] Reference Figure 5 and Figure 8 The bottom of the stamped recessed groove 301 is provided with multiple contact insertion holes 302, and the sealing strip 4 has a fixed protruding contact 401 extending into the contact insertion hole 302 on the side near the bottom of the stamped recessed groove 301. The fixed protruding contact 401 and the contact insertion hole 302 form an interference fit. Due to this fitting and fixing method, there is no need to use glue to bond, which simplifies the assembly process, improves the installation efficiency, and allows the sealing strip 4 to be firmly fixed in the stamped recessed groove 301, making it difficult to fall off. At the same time, the sealing strip 4 adopts a flat cross-section design, which is simple in structure, easy to mass-produce, and effectively reduces production costs. Moreover, the flat structure makes it uniformly stressed when under pressure, and it is not easy to slip or deform, so it can maintain a stable sealing effect for a long time, further improving the overall sealing performance and weather resistance of the cabinet.

[0042] Reference Figure 5 An observation window is provided in the middle of the first door 7, and a transparent glass is fixed inside the observation window. The edge of the transparent glass is provided with a sealing strip. Lock bodies 8 are provided on the outer wall of the first door 7 and the second door 9 on the side away from the hinge module 5.

[0043] Reference Figure 5 , Figure 8 and Figure 10The bottom of the outer casing 3 has fan-shaped insertion holes 304 near the four corners. The fixed support includes fan-shaped corrosion-resistant pads 14 welded to the bottom inner wall of the main frame 15 near the four corners. The bottom end of the fan-shaped corrosion-resistant pads 14 passes through the fan-shaped insertion holes 304. The same L-shaped support foot 12 is fixed to the two right-angled surfaces of the fan-shaped corrosion-resistant pads 14 located at the bottom of the cabinet. The outer side of the L-shaped support foot 12 is flush with the outer wall of the cabinet. The upper surface of the fan-shaped corrosion-resistant pads 14 has strip-shaped perforations, and anchor bolts 11 are inserted into the strip-shaped perforations. The top of the anchor bolts 11 is respectively provided with anti-loosening washers 23 and fastening nuts. The rubber cap 22 has an anti-loosening retaining ring on its inner circumference near the bottom opening, which matches the edge of the anti-loosening washer 23. During installation, after the fastening nut is tightened, apply a small ring of foam adhesive to the anti-loosening retaining ring of the rubber cap 22. This seals the area and acts as an adhesive. Then, attach the cap to the anti-loosening washer 23 to prevent the fastening nut from rusting. After all the anchor bolts 11 are installed, squeeze the foam adhesive from the bottom of the cabinet towards the lower surface of the fan-shaped corrosion-resistant pad 14 near the strip-shaped perforation until the hole is filled. This will protect the exposed anchor bolts 11.

[0044] Reference Figure 8 and Figure 9 The bottom of the outer casing 3 has a circular hole 303 near the center, and an anti-corrosion ring 17 is welded into the circular hole 303. The anti-corrosion ring 17 has a trumpet-shaped structure with the opening facing downwards. The outer circumference of the anti-corrosion ring 17 has a pre-reserved anti-detachment and outward curling edge 171 near the top. The anti-corrosion ring 17 can pass through the incoming and outgoing cables 16. The outer circumference of the anti-corrosion ring 17 and the outer walls of all the incoming and outgoing cables 16 are connected by the same waterproof rubber band ring 18. The outer circumference of the waterproof rubber band ring 18 is wrapped with a first tightening rope 20 and a second tightening rope 21 above and below the anti-detachment and outward curling edge 171, respectively. After being tied, foam glue is filled into the gaps. By setting the anti-corrosion ring 17 with such a structure, a reverse slope can be formed, which can not only prevent insects and ants from crawling in, but also effectively isolate moisture and play a moisture-proof role.

[0045] Reference Figure 5 and Figure 8 The outer casing 1 has symmetrical side mounting holes 101 on its left and right sides near the center. Each side mounting hole 101 has an inwardly recessed rainproof recess 13. The longitudinal section of the rainproof recess 13 is a right trapezoid, with the right angle side of the trapezoid located at the top. The top of the rainproof recess 13 has multiple air inlets 131, and the top of the air inlets 131 is equipped with a dehumidification box 2, which can ventilate and dehumidify the internal moisture when the humidity reaches the required dehumidification level.

[0046] Reference Figure 5 , Figure 8 andFigure 11 Two horizontal intermediate frames 19 are fixed between the four vertical rods of the main frame 15, and the dehumidification box 2 is fixed to the intermediate frame 19 near the top. The dehumidification box 2 includes a cuboid shell 201 fixed to the lower surface of the intermediate frame 19. The cuboid shell 201 is placed horizontally, and a side baffle 204 is fixed to the opening at one end of the cuboid shell 201. A heater is fixed to the end of the cuboid shell 201 away from the side baffle 204, and three interconnected rods are reserved on the side of the heater. The electric heating rods 206 extend horizontally into the dehumidification box 2. Inside the rectangular shell 201, there are also air guide plates 203 and L-shaped air guide plates 205, which are used to separate the three electric heating rods 206. Two fans 202 are embedded on the side of the rectangular shell 201 closest to the inside of the cabinet. The air guide plates 203 and L-shaped air guide plates 205 divide the interior into an S-shape, forcing the airflow to enter from the bottom and pass through the three electric heating rods 206 before exiting from the fans 202, thus fully removing the moisture.

[0047] Working principle: Before installation, holes are drilled at the installation positions according to the location of the central strip hole in the four fan-shaped corrosion-resistant pads 14 to install the anchor bolts 11. During installation, after the fastening nut is tightened, a small ring of foam adhesive is applied to the anti-loosening retaining ring of the rubber cap 22, and then it is fastened onto the anti-loosening washer 23. After all the anchor bolts 11 are installed, the foam adhesive is squeezed from the bottom of the cabinet towards the lower surface of the fan-shaped corrosion-resistant pads 14 near the strip hole until the hole is filled. Then, the incoming and outgoing cables 16 are handled by using tightening rope 1 20 and tightening rope 2 21 to secure them to the anti-loosening outer sleeve. Tighten the waterproof rubber band 18 at the rolled edge 171 until the gap is minimized. After binding, fill the gap with foam glue to complete the installation. When you need to open the door, simply pull the T-shaped pull rod 505 outward until the entire position of the hinge shaft 507 is pulled out of the front of the cabinet. Then you can open the door. The cabinet is equipped with a humidity sensor. When the humidity reaches the required level, the heater in the dehumidification box 2 will be activated to ventilate and dehumidify the internal humidity. After the airflow enters from the bottom of the dehumidification box 2, it must pass through three electric heating rods 206 before exiting from the fan 202, thus fully removing the moisture.

[0048] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A low-voltage grid-connected switchgear with dustproof and salt spray resistance, comprising a main frame (15), a first outer shell (1), and a second outer shell (3), characterized in that, The main frame (15) has fixed support parts welded at the four corners of the bottom, and rectangular holes one and two are respectively opened at the upper and lower ends of the front of the outer shell two (3). The edges of rectangular holes one and two are punched inward to form stamped grooves (301). Sealing strips (4) are fixed at the bottom of the two stamped grooves (301). Box door one (7) and box door two (9) are respectively hinged at rectangular holes one and two. Hinges (5) are provided between the inner wall of one side of the outer shell (1) near the stamped recess (301) and the first door (7) and the second door (9). The hinge module (5) includes a grooved slide rail (501) fixed to the inner wall of the outer shell (1). A sliding seat (502) is slidably connected in the groove of the grooved slide rail (501). The sliding seat (502) includes an L-shaped base plate and two parallel arc-shaped hinge rods. The first door (7) and the second door (9) are rotatably connected to the ends of the arc-shaped hinge rods.

2. A low-voltage grid-connected switchgear with dustproof and salt spray resistance as described in claim 1, characterized in that, The outer shell one (1) wraps around the left and right sides and the rear side of the main frame (15), and the outer shell two (3) wraps around the upper and lower surfaces and the front of the main frame (15); The L-shaped base plate has guide slots (508) on both the top and bottom sides, and the ends of the two arc-shaped hinge rods away from the L-shaped base plate are fixed with the same vertical hinge shaft (507). The hinge shaft (507) has a rotating block (506) embedded and fixed in the first (7) or the second (9) of the cabinet. The bottom of the groove of the groove slide rail (501) is fixed with a spring baffle (503) near the back of the cabinet, and the spring baffle (503) is fixed with the L-shaped base plate with a reset mechanism. Spring (504); The first box door (7) and the second box door (9) are both fixed with a pressing ridge frame (6) near the edge of the cabinet body, and the shape and size of the pressing ridge frame (6) are adapted to the size of the sealing strip (4); The overall distance of the arc-shaped hinge rod from the mounting surface of the hinge module (5) is greater than the width of the stamped recessed groove (301), and the extension length of the arc-shaped hinge rod is greater than the distance between the inner edge of the pressing ridge frame (6) and the outer edge of the first box door (7).

3. A low-voltage grid-connected cabinet with dustproof and salt spray resistance as described in claim 1, characterized in that, Both the first (7) and the second (9) of the cabinet are provided with mounting holes that are compatible with the shape of the rotating block (506) near the hinge module (5), and the rotating block (506) is provided with a hidden slot on the side near the outside of the cabinet. A T-shaped pull rod (505) is hinged in the hidden slot, and a reset torsion spring is sleeved on the movable shaft of the T-shaped pull rod (505).

4. A low-voltage grid-connected cabinet with dustproof and salt spray resistance as described in claim 3, characterized in that, The junction of the outer shell 1 (1) and the outer shell 2 (3) is welded. The exposed sides of the outer shell 1 (1), the outer shell 2 (3), the first door (7) and the second door (9) are all rust-proofed. The hinge module (5) is made of stainless steel, and all its parts are nickel-plated or have a nano-coating. The front of the second door (9) is provided with an exhaust hole (10) near the bottom. The exhaust hole (10) is provided with a one-way exhaust valve inside.

5. A low-voltage grid-connected switchgear with dustproof and salt spray resistance as described in claim 1, characterized in that, The bottom of the stamped recessed groove (301) is provided with multiple contact insertion holes (302), and the sealing strip (4) near the bottom of the stamped recessed groove (301) has a fixed protruding contact (401) that extends into the contact insertion hole (302), and the fixed protruding contact (401) and the contact insertion hole (302) form an interference fit.

6. A low-voltage grid-connected cabinet with dustproof and salt spray resistance as described in claim 1, characterized in that, The first door (7) has an observation window in the middle, and a transparent glass is fixed inside the observation window. The edge of the transparent glass is provided with a sealing strip. The outer wall of the first door (7) and the second door (9) away from the hinge module (5) is provided with a lock body (8).

7. A low-voltage grid-connected switchgear with dustproof and salt spray resistance as described in claim 1, characterized in that, The bottom of the outer shell (3) is provided with fan-shaped insertion holes (304) near the four corners. The fixed support part includes fan-shaped corrosion-resistant pads (14) welded to the bottom inner wall of the main frame (15) near the four corners. The bottom end of the fan-shaped corrosion-resistant pads (14) passes through the fan-shaped insertion holes (304). The fan-shaped corrosion-resistant pads (14) are fixed with the same L-shaped support foot (12) at the two right angles of the lower part of the cabinet. The outer side dimension of the L-shaped support foot (12) is flush with the outer wall of the cabinet. The upper surface of the fan-shaped corrosion-resistant pads (14) is provided with strip-shaped through holes. Anchor bolts (11) are inserted into the strip-shaped through holes. The top of the anchor bolts (11) is provided with anti-detachment pads (23), fastening nuts and rubber caps (22). The inner circumference of the rubber caps (22) is provided with anti-detachment rings that are compatible with the edge of the anti-detachment pads (23) near the bottom opening.

8. A low-voltage grid-connected switchgear with dustproof and salt spray resistance as described in claim 1, characterized in that, The bottom of the outer casing 2 (3) is provided with a round hole (303) near the middle, and an anti-corrosion ring (17) is welded in the round hole (303). The anti-corrosion ring (17) is a trumpet-shaped structure with the opening facing downwards. The outer circumference of the anti-corrosion ring (17) is reserved with an anti-detachment and outward rolling edge (171) near the top. The anti-corrosion ring (17) can pass through the incoming and outgoing cables (16). The outer circumference of the anti-corrosion ring (17) and the outer walls of all the incoming and outgoing cables (16) are connected with the same waterproof rubber band ring (18). The outer circumference of the waterproof rubber band ring (18) is wrapped with a first tightening rope (20) and a second tightening rope (21) above and below the anti-detachment and outward rolling edge (171), respectively. After being tied, foam glue is filled into the gap.

9. A low-voltage grid-connected cabinet with dustproof and salt spray resistance as described in claim 1, characterized in that, The outer casing (1) has symmetrical side mounting holes (101) on its left and right sides near the middle, and each side mounting hole (101) is fitted with an inwardly recessed rainproof recess (13). The longitudinal section of the rainproof recess (13) is a right trapezoid, and the right angle side of the right trapezoid is located at the top. The top of the rainproof recess (13) is provided with multiple air inlets (131), and a dehumidification box (2) is provided at the top of the air inlets (131).

10. A low-voltage grid-connected cabinet with dustproof and salt spray resistance as described in claim 9, characterized in that, Two horizontal intermediate frames (19) are fixed between the four vertical rods of the main frame (15), and the dehumidification box (2) is fixed on the intermediate frame (19) near the top. The dehumidification box (2) includes a cuboid shell (201) fixed to the lower surface of the intermediate frame (19), and the cuboid shell (201) is placed horizontally. A side baffle (204) is fixed at one end of the cuboid shell (201). The cuboid shell (201) is further away from the side baffle. A heater is fixed at one end of the 204), and three parallel electric heating rods (206) are reserved on the side of the heater to extend horizontally into the dehumidification box (2). Inside the rectangular shell (201), there are also air guide plate one (203) and L-shaped air guide plate two (205) to separate the three electric heating rods (206). Two fans (202), air guide plate one (203) and L-shaped air guide plate two (205) are embedded on the side of the rectangular shell (201) near the inside of the cabinet.

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