Armoured draw-out ac metal-enclosed switchgear

Abstract

This invention discloses an armored withdrawable AC metal-enclosed switchgear, belonging to the field of switchgear technology. The device includes a cabinet, a dual-chamber piping assembly fixed outside the cabinet and connecting each high-voltage compartment, a dehumidification assembly, and a heating and regeneration assembly. This invention forms independent air intake and exhaust channels outside the cabinet through the dual-chamber piping assembly, achieving full cabinet dehumidification without damaging the metal isolation barriers of each compartment, effectively preventing the spread of arcing faults. A switching unit drives the dehumidification box to alternate between dehumidification and heating positions, working in conjunction with the heating and regeneration assembly to regenerate the drying medium, solving the problems of high load and easy desiccant saturation and failure in open-circuit dehumidification systems. A mechanical linkage mechanism enables synchronous control of position reversal, vent opening and closing, and heat source displacement by the power source, resulting in a compact structure and high degree of automation, improving the insulation reliability and operational safety of the switchgear in complex environments.

Description

Technical Field

[0001] This invention relates to the field of switchgear technology, and more particularly to armored withdrawable AC metal-enclosed switchgear. Background Technology

[0002] Armored withdrawable AC metal-enclosed switchgear is a core hub device in power distribution systems. To ensure operational safety and effectively limit the impact of faults, its internal structure adheres to "armored" standards, using grounded metal partitions to divide it into independent, physically isolated high-voltage compartments such as busbar compartments, circuit breaker compartments, and cable compartments. In actual operation, because switchgear is often installed in substations with complex environments, it is susceptible to alternating day-night temperature differences and high humidity, leading to condensation inside each independent compartment. This condensation reduces the electrical insulation performance of the high-voltage insulation components within the switchgear. Therefore, effective dehumidification and drying of the switchgear interior is necessary.

[0003] For example, an indoor AC metal-clad withdrawable switchgear with publication number CN111130001B includes a cabinet, a spirally arranged exhaust pipe, an exhaust port, an exhaust pipe, an intake pipe, a drying device, a rotating shaft, fan blades, and a drive device. This allows for the pre-drying of the air entering the cabinet and the drying of the air in the exhaust pipe, reducing moisture backflow and thus helping to maintain the dryness of the cabinet. The gas circulation also helps to dissipate heat from the interior of the switchgear.

[0004] However, the technical solutions disclosed in the aforementioned prior art have shortcomings in practical applications. First, the use of continuous spiral pipes to sequentially penetrate each high-pressure compartment destroys the original metal-sealed isolation barrier of the armored equipment. Once an arcing explosion occurs in a gas chamber, this through-pipeline can easily become a channel for the spread of flames and high-temperature free gases across chambers, leading to an expansion of the fault area. Second, the system has an open gas path structure, continuously introducing humid air from the external environment at the air inlet. This not only increases the additional dehumidification load but also causes the static drying medium at the air inlet to easily absorb water and become saturated, resulting in rapid failure.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0006] This invention provides armored withdrawable AC metal-enclosed switchgear to solve the technical problems in existing switchgear dehumidification schemes, such as the through-type exhaust pipe damaging physical isolation, leading to the easy spread of arcing faults, and the open air circuit continuously introducing external moisture, resulting in increased dehumidification load and easy saturation and failure of the drying medium.

[0007] The embodiments of the present invention adopt the following technical solution: armored withdrawable AC metal-enclosed switchgear, including a cabinet, which has multiple high-voltage compartments isolated inside; A dual-chamber piping assembly is fixed to the outside of the cabinet and connects to each of the high-pressure compartments, forming an independently isolated air intake and exhaust channel outside the cabinet. A dehumidification component, located at the bottom of the dual-cavity pipeline assembly, includes a ventilation unit, multiple dehumidification boxes, and a switching unit. The ventilation unit is used to connect the dual-cavity pipeline assembly to form a fixed channel for airflow in and out. The switching unit is used to drive the dehumidification boxes to alternate between the dehumidification station and the heating station. A heating and regeneration component is disposed on top of the dehumidification component and is connected to the switching unit for linkage with the switching unit and sliding between corresponding heating stations to heat and dry the dehumidification box at the corresponding heating station.

[0008] Furthermore, the plurality of dehumidification boxes include a main dehumidification box and a backup dehumidification box. The ventilation unit includes a third Y-shaped connector, a chamber shell, a bottom cover plate, an exhaust pipe, and an air inlet pipe. The third Y-shaped connector is connected to the bottom end of the dual-cavity pipeline assembly. Its interior is divided into two connector ends by a connecting pipe partition. The chamber shell is connected to the bottom ends of the two connector ends. The bottom cover plate is detachably connected to the bottom of the chamber shell. The upper surface of the chamber shell and the bottom cover plate are provided with four corresponding first through holes and second through holes at equal intervals of 90 degrees. The exhaust pipe is fixed on the bottom cover plate and corresponds to one set of through holes at the top and bottom. One end of the exhaust pipe extends downward through the bottom cover plate. An exhaust fan for drawing out exhaust gas is provided inside the exhaust pipe. Both the main dehumidifier box and the spare dehumidifier box are placed on the bottom cover plate with corresponding through holes at the top and bottom. The spare dehumidifier box is located between the main dehumidifier box and the exhaust pipe. The air inlet is fixed to the bottom surface of the bottom cover plate and is set in relation to the main dehumidifier box. The air inlet is equipped with a fan for supplying dry airflow into the cabinet.

[0009] Furthermore, the switching unit includes a mounting cover, a forward and reverse motor, and a central pivot. The mounting cover is fitted onto the exhaust pipe and the intake pipe, and is connected to the bottom surface of the bottom cover plate by fasteners. The forward and reverse motor is fixed to the bottom surface of the mounting cover plate and is used to achieve only forward or reverse rotation each time. The central pivot is vertically rotatably located at the center of the bottom cover plate, and is connected to the main dehumidifier box and the spare dehumidifier box through a connecting plate, and is connected to the output end of the forward and reverse motor.

[0010] Furthermore, the switching unit also includes a drive gear, a limiting sleeve, a transmission rack, and a shielding plate. The drive gear is disposed on the bottom surface of the bottom cover plate and fixedly sleeved on the central pivot. The limiting sleeve is symmetrically fixed on the surfaces of the air inlet and exhaust pipes. Two transmission racks are symmetrically arranged and both mesh with the drive gear. The transmission racks are slidably disposed between the two limiting sleeves located in a row. The shielding plate is fixed to the side of the two transmission racks that are far apart from each other by a bracket. In addition to the two through holes corresponding to the exhaust pipe and the air inlet, the bottom cover plate has two other symmetrically distributed through holes that define the first heating station and the second heating station, respectively. In the initial state, one of the shielding plates closes the second heating station, while the other shielding plate avoids the first heating station and is in an open state. When the drive gear rotates and drives the two transmission racks to move in opposite directions, the two shielding plates slide synchronously to close the first heating station and open the second heating station.

[0011] Furthermore, the heating and regeneration assembly includes a waist-shaped box, a cover plate, and a heating module. The waist-shaped box is fixed to the upper surface of the chamber shell, and its two ends correspond to the top of the first heating station and the second heating station. The cover plate is detachably fitted onto the waist-shaped box, and filter screens are provided at both ends of the cover plate. Slide tracks are provided on both sides of the inner wall of the waist-shaped box. The heating module is slidably disposed inside the waist-shaped box, and sliding pins are fixed on both sides of the module and slide within the slide tracks. The heating module has an air supply cavity that runs vertically through it. Inside the cavity, a centrifugal fan and a heating element are arranged sequentially from top to bottom. The centrifugal fan forces the air drawn in through the upper filter to flow downward through the heating element, thereby forming a high-temperature dry airflow that blows downward.

[0012] Furthermore, the heating and regeneration assembly also includes a displacement rod, a return spring, an arc-shaped outer guide rod, and a traction link. The displacement rod is horizontally fixed to the side of the heating module and moves through one end of the waist-shaped box. The traction link connects the central pivot and the arc-shaped outer guide rod. The arc-shaped outer guide rod is located on one side of the outer periphery of the chamber shell, and its inner surface is a gradually narrowing inner arc surface with a gradually decreasing radius of curvature. The return spring is sleeved on the displacement rod, with its two ends connected to the outer surface of the waist-shaped box and the inner wall of the arc-shaped outer guide rod, respectively. Under the action of the return spring, the displacement rod is always in contact with the inner arc surface of the arc-shaped outer guide rod. When the central pivot synchronously drives the arc-shaped outer guide rod to rotate circumferentially, the end of the displacement rod is gradually pushed by the tapered inner arc surface and overcomes the elastic force of the return spring to generate linear displacement, so as to drive the heating module to slide along the slide between the first heating station and the second heating station.

[0013] Furthermore, the interior of the cabinet is divided into independent instrument room, busbar room, circuit breaker room and cable room by metal partitions.

[0014] Furthermore, the dual-cavity piping assembly includes a fixed bracket, a U-shaped clamp, a dual-cavity main pipe, and a main pipe partition. Several fixed brackets are provided and fixed to the outer side of the cabinet. The U-shaped clamps are fixed to the fixed brackets by nuts. The dual-cavity main pipe is fixed in a pipe clamp formed by the fixed brackets and the U-shaped clamps and is arranged vertically. The main pipe partition is arranged axially inside the dual-cavity main pipe to divide the dual-cavity main pipe into independent air inlet and exhaust chambers.

[0015] Furthermore, the dual-cavity piping assembly also includes two side branch pipes, two first Y-shaped connectors, and two first deep air inlet pipes. The two side branch pipes are respectively located at the upper and lower ends of the dual-cavity main pipe, and their interiors are provided with partition plates corresponding to the main pipe partitions. The first Y-shaped connectors are respectively connected to one end of the corresponding side branch pipes. The interiors of the first Y-shaped connectors are divided into an air inlet port and an air outlet port along the two branch pipe ends by the partition plates. The first Y-shaped connector located at the upper end is connected to the busbar chamber, and the first Y-shaped connector located at the lower end is connected to the circuit breaker chamber. The first deep air inlet pipes are respectively connected to the air inlet ports of the corresponding first Y-shaped connectors for sending airflow into the corresponding chambers.

[0016] Furthermore, the dual-cavity piping assembly also includes a central branch pipe, a tee pipe, two second Y-shaped connectors, and two second deep air inlet pipes. The central branch pipe is connected to the surface of the dual-cavity main pipe, and a partition plate is provided inside it corresponding to the main pipe partition. The tee pipe is connected to one end of the central branch pipe. The two second Y-shaped connectors are respectively connected to both ends of the tee pipe. The interior of the second Y-shaped connector is divided into an air inlet port and an air outlet port along its two branch pipe ends by the partition plate. The second Y-shaped connector located at the upper end is connected to the instrument compartment, and the second Y-shaped connector located at the lower end is connected to the cable compartment. The two second deep air inlet pipes are respectively connected to the air inlet ports of the two second Y-shaped connectors for sending airflow into the corresponding compartments.

[0017] The technical solutions adopted in the embodiments of the present invention can achieve the following beneficial effects: This invention relates to an armored withdrawable AC metal-enclosed switchgear. By incorporating a dual-chamber piping assembly on the exterior of the cabinet, it creates independently isolated air intake and exhaust channels while maintaining the physical metal isolation barrier between each high-voltage compartment. This effectively solves the risk of arcing faults spreading across compartments, a risk inherent in traditional through-type piping, and ensures the safe operation of the power system. By setting up a dehumidification assembly including main and backup dehumidification boxes and a switchable heating and regeneration assembly, online automatic regeneration and recycling of the dehumidification medium are achieved. This not only avoids the increased dehumidification load caused by the continuous introduction of external moisture through open air paths but also overcomes the defect of traditional static drying media being prone to saturation and failure. Furthermore, utilizing the mechanical linkage design of the switching unit and traction linkage mechanism, only a single power source is needed to simultaneously realize the reversal of the dehumidification box position, the opening and closing of the air path shielding plate, and the displacement compensation of the heating source, resulting in a compact structure and high synchronization. Combined with the forced convection circulation formed by the deep air intake pipe and the safety redundancy design of the fire damper at the interface, this invention improves dehumidification efficiency while ensuring high reliability of the switchgear in complex environments. Attached Figure Description

[0018] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0019] In the attached diagram: Figure 1 This is an overall schematic diagram of the armored withdrawable AC metal-enclosed switchgear of the present invention; Figure 2 This is a schematic diagram of the internal structure of the armored withdrawable AC metal-enclosed switchgear of the present invention; Figure 3 For the present invention Figure 1 A schematic diagram of the dual-lumen piping assembly structure; Figure 4 For the present invention Figure 3 A schematic diagram of a partial structure; Figure 5 For the present invention Figure 4 A schematic diagram of a partial structure; Figure 6 For the present invention Figure 5 Internal structure diagram; Figure 7 For the present invention Figure 6 A magnified structural diagram at point A; Figure 8 For the present invention Figure 6 A schematic diagram of a partial structure; Figure 9 For the present invention Figure 8 A schematic diagram of the bottom structure; Figure 10 For the present invention Figure 9 A magnified structural diagram at point B; Figure label: 1. Cabinet; 11. Instrument compartment; 12. Busbar compartment; 13. Circuit breaker compartment; 14. Cable compartment; 2. Dual-cavity piping assembly; 21. Fixing bracket; 22. U-clamp; 23. Dual-cavity main pipe; 24. Side branch pipe; 25. First Y-joint; 251. First deep air inlet pipe; 26. Middle branch pipe; 27. T-joint; 28. Second Y-joint; 29. ​​Second deep air inlet pipe; 210. Main pipe partition; 3. Dehumidification assembly; 31. Third Y-joint; 301. Pipeline partition; 32. Connector end; 33. Chamber shell; 331. Bottom cover plate; 332. First through hole; 3 33. Second through hole; 34. Exhaust pipe; 35. Main dehumidifier box; 36. Spare dehumidifier box; 37. Air inlet; 38. Mounting cover; 39. Forward and reverse motors; 310. Central pivot; 312. Drive gear; 313. Limit sleeve; 314. Transmission rack; 315. Shielding plate; 4. Heating and regeneration assembly; 41. Waist-shaped box; 411. Slide rail; 42. Cover plate; 43. Filter screen; 44. Heating module; 441. Sliding pin shaft; 442. Heating element; 443. Centrifugal fan; 45. Displacement rod; 46. Return spring; 47. Arc-shaped outer guide rod; 48. Traction link. Detailed Implementation

[0020] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0021] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] Reference Figures 1-10 As shown, this embodiment of the invention provides an armored withdrawable AC metal-enclosed switchgear, including a cabinet 1, a dual-chamber piping assembly 2, a dehumidification assembly 3, and a heating and regeneration assembly 4. The cabinet 1 is internally divided into an independent instrument compartment 11, a busbar compartment 12, a circuit breaker compartment 13, and a cable compartment 14 by metal partitions. This physical isolation is the core barrier preventing the spread of arcing faults in the armored equipment. To achieve full cabinet dehumidification without compromising this barrier, this embodiment fixes the dual-chamber piping assembly 2 to the outside of the cabinet 1 and connects it to each high-voltage compartment, forming independently isolated air intake and exhaust channels outside the cabinet 1.

[0023] Specifically, the dual-cavity piping assembly 2 includes a fixed bracket 21, a U-shaped clamp 22, a dual-cavity main pipe 23, and a main pipe partition 210. Several fixed brackets 21 are provided and fixed vertically at intervals on the outer side of the cabinet 1. The U-shaped clamp 22 spans the dual-cavity main pipe 23 and is locked to the corresponding fixed bracket 21 with a nut. Together, they form a ring-shaped clamp structure, thereby vertically and securely installing the dual-cavity main pipe 23 outside the cabinet 1. Internally, the main pipe partition 210 is axially inserted inside the dual-cavity main pipe 23, longitudinally dividing the internal space of the dual-cavity main pipe 23 into independent air inlet and exhaust chambers. This allows for simultaneous airflow in and out within a single main pipe, saving space for piping and installation outside the cabinet 1.

[0024] The dual-chamber piping assembly 2 also includes two side branch pipes 24, two first Y-shaped connectors 25, and two first deep air inlet pipes 251. The two side branch pipes 24 are respectively connected to the upper and lower ends of the dual-chamber main pipe 23. Inside each side branch pipe, a partition plate is provided corresponding to the main pipe partition 210 to maintain the physical isolation of the air intake and exhaust channels within the main pipe, ensuring that the dry air supply and humid air exhaust do not interfere with each other when branching. The two first Y-shaped connectors 25 are respectively connected to the ends of the corresponding side branch pipes 24. The interior of each first Y-shaped connector 25 is divided into an air intake port and an air outlet port along the two ends of its branch pipe by a partition plate, so as to physically divert the parallel air intake and exhaust flows, making it easy to connect to the cabinet 1 respectively.

[0025] The upper Y-shaped connector 25 connects to the busbar compartment 12, and the lower Y-shaped connector 25 connects to the circuit breaker compartment 13, thus creating a dedicated dehumidification circuit for these two independent high-voltage compartments. The first air inlet deep pipe 251 is connected to the air inlet port of the corresponding first Y-shaped connector 25 and extends into the interior of the corresponding compartment to guide and deliver airflow to the far end of the interior of the corresponding compartment, thereby creating a spatial distance from the air outlet port located near the cabinet wall, forming a large-scale forced air convection circulation inside the compartment, effectively preventing near-end short circuits in the airflow.

[0026] The dual-cavity piping assembly 2 also includes a central branch pipe 26, a tee pipe 27, two second Y-shaped connectors 28, and two second deep air inlet pipes 29. The central branch pipe 26 is connected to the surface of the dual-cavity main pipe 23, and its interior is also provided with a partition plate corresponding to the main pipe partition 210, so that the air inlet and exhaust in the main pipe are kept isolated when they are led outward. The tee pipe 27 is connected to the end of the central branch pipe 26 and is used to split the pipeline upward and downward. The two second Y-shaped connectors 28 are respectively connected to the two ends of the tee pipe 27, and the interior of the second Y-shaped connector 28 is divided into an air inlet port and an air outlet port along its two branch pipe ends by a partition plate.

[0027] The upper second Y-shaped connector 28 connects to the instrument compartment 11, and the lower second Y-shaped connector 28 connects to the cable compartment 14. The two second deep air inlet pipes 29 are respectively connected to the air inlet ports of the two second Y-shaped connectors 28 and extend into the interior of the corresponding compartments, sending the airflow to the far end of the compartment, thereby creating a distance from the air outlet, promoting indoor air convection and preventing airflow short circuit. Through the above structure, the external dehumidification pipe network covering the four high-pressure air chambers of the entire cabinet is completed. Flow regulating valves are installed at the air outlet ports of each first Y-shaped connector 25 and second Y-shaped connector 28 to preset the air inlet resistance according to the volume of each compartment, ensuring uniform distribution of the drying airflow.

[0028] The dehumidification component 3 is located at the bottom of the dual-cavity pipeline component 2 and includes an air ventilation unit, multiple dehumidification boxes and a switching unit. The air ventilation unit is used to connect the dual-cavity pipeline component 2 to form a fixed channel for airflow in and out.

[0029] Multiple dehumidification boxes include a main dehumidification box 35 and a backup dehumidification box 36. The interior of both the main dehumidification box 35 and the backup dehumidification box 36 is filled with at least one adsorbent material selected from silica gel, molecular sieve or lithium chloride. The upper and lower walls of the dehumidifier box have a grid structure to facilitate airflow through the adsorption layer for moisture exchange. The ventilation unit includes a third Y-shaped connector 31, a housing 33, a bottom cover plate 331, an exhaust pipe 34, and an air inlet pipe 37. The third Y-shaped connector 31 is connected to the bottom end of the dual-cavity pipeline assembly 2, and its interior is divided into two connector ends 32 by a pipe partition 301, so that the downward humid airflow and the upward dry airflow are physically isolated. The housing 33 is connected to the bottom end of the two connector ends 32. The bottom cover plate 331 is detachably connected to the bottom of the housing 33. The upper surface of the housing 33 and the bottom cover plate 331 are equally spaced at 90 degrees and have four corresponding first through holes 332 and second through holes 333, thereby defining four arrangement positions in the circumferential direction for the dehumidifier box to rotate and switch between dehumidification, heating and standby states.

[0030] The exhaust pipe 34 is fixed on the bottom cover plate 331 and corresponds to one of the through holes at the top and bottom. One end of the exhaust pipe 34 extends downward through the bottom cover plate 331 and is equipped with an exhaust fan for drawing out the exhaust gas. The air inlet pipe 37 is fixed on the bottom surface of the bottom cover plate 331 and is set corresponding to the main dehumidification box 35. It is equipped with a supply fan for conveying airflow.

[0031] During dehumidification, the exhaust fan starts and generates negative pressure in the exhaust chamber, drawing out the humid air from each high-pressure compartment in the cabinet and conveying it downwards. The humid air passes through the dehumidification box at the working position, is dried, and then pressurized by the supply fan. It is then sent back to the high-pressure compartment along the air inlet chamber and each air inlet pipe, forming a dry airflow loop in the cabinet.

[0032] To meet the drying requirements after the dehumidifier box is saturated with moisture, the switching unit is used to drive the dehumidifier box to rotate between the dehumidification station and the heating station. This switching action is controlled by the control system. When the humidity sensor set at the air inlet of the main dehumidifier box 35 detects that the humidity difference is lower than the preset threshold, it determines that the main dehumidifier box 35 is saturated with moisture and triggers the switching program.

[0033] The switching unit includes a mounting cover 38, a forward / reverse motor 39, and a central pivot 310. The mounting cover 38 is fitted onto the outside of the exhaust pipe 34 and the intake pipe 37 and is fixed to the bottom surface of the bottom cover 331 by fasteners. The forward / reverse motor 39 is fixed to the bottom surface of the mounting cover 38 and is used to output 90 degrees of forward or reverse rotation power. The central pivot 310 is vertically and rotatably inserted through the center of the bottom cover 331. Its upper end is connected to the main dehumidifier box 35 and the spare dehumidifier box 36 through a connecting plate, and its lower end is connected to the output end of the forward / reverse motor 39.

[0034] To enclose the heating stations in non-working states, the switching unit also includes a drive gear 312, a limiting sleeve 313, a transmission rack 314, and a shielding plate 315. In addition to the two through holes corresponding to the exhaust pipe 34 and the air inlet pipe 37, the bottom cover plate 331 has two other symmetrically distributed through holes forming the first heating station and the second heating station, respectively. The drive gear 312 is disposed on the bottom surface of the bottom cover plate 331 and is fixedly sleeved on the central pivot 310. The limiting sleeves 313 are symmetrically fixed to the outer walls of the air inlet pipe 37 and the exhaust pipe 34. Both transmission racks 314 mesh with the drive gear 312, and the transmission racks 314 are slidably guided between the corresponding limiting sleeves 313. The outer ends of both transmission racks 314 opposite to the drive gear 312 are fixed with shielding plates 315 via brackets.

[0035] In the initial position, one side of the shielding plate 315 covers the second heating station, while the other side of the shielding plate 315 is in a clearance position to keep the first heating station open. When switching the dehumidification box station, the forward and reverse motors 39 drive the central pivot 310 to rotate 90 degrees circumferentially. The central pivot 310 drives the spare dehumidification box 36 to rotate to the dehumidification station, and the central pivot 310 simultaneously drives the main dehumidification box 35 to rotate to the corresponding second heating station. During this rotational transmission process, the drive gear 312 fixed on the central pivot 310 rotates synchronously. The drive gear 312 drives the transmission racks 314 on both sides to slide in opposite directions along the limiting sleeve 313. The transmission racks 314 drive the shielding plates 315 at the corresponding ends to move synchronously, so as to close the first heating station which is currently in an empty state and open the second heating station carrying the main dehumidification box 35. Thus, the airflow direction is switched through mechanical linkage, and the loss of hot air from the non-working side station is blocked.

[0036] The heating and regeneration component 4 is located on top of the dehumidification component 3, and the heating and regeneration component 4 is connected to the switching unit for transmission, thereby realizing the displacement between the first heating station and the second heating station through linkage.

[0037] Specifically, the heating and regeneration assembly 4 includes a waist-shaped box 41, a cover plate 42, and a heating module 44. The waist-shaped box 41 is fixed to the upper surface of the housing 33, and its two ends correspond to the top of the first heating station and the second heating station, respectively. The cover plate 42 is detachably fitted onto the waist-shaped box 41, and filter screens 43 are provided at both ends of the cover plate 42. Horizontal slide rails 411 are provided on both sides of the inner wall of the waist-shaped box 41. The heating module 44 is disposed inside the waist-shaped box 41, and sliding pins 441 are fixed on both sides of the heating module 44, and the sliding pins 441 are embedded in the slide rails 411 to form a sliding fit.

[0038] The heating module 44 has an internal air supply cavity that runs vertically through it. A centrifugal fan 443 and a heating element 442 are arranged sequentially from top to bottom in the air supply cavity. In operation, the centrifugal fan 443 draws air in through the filter 43 above and forces it downward to flow through the heating element 442, forming a hot airflow that is sprayed downward to heat and dehydrate the dehumidification box below. The desorbed hot and humid airflow is discharged through the casing 33.

[0039] To ensure the safety of the regeneration process, the heating element 442 is equipped with a temperature protection switch. When the measured temperature at the heating station exceeds the preset safety value (e.g., 70°C), the control system cuts off the power supply to the heating element 442 to prevent heat buildup from damaging the adsorption material inside the dehumidifier box or affecting the electrical safety of the cabinet 1.

[0040] To achieve synchronous displacement of the heat source as the dehumidification box switches, the heating and regeneration assembly 4 also includes a displacement rod 45, a return spring 46, an arc-shaped outer guide rod 47, and a traction link 48. The displacement rod 45 is horizontally fixed to the side of the heating module 44, and it movably passes through one end of the waist-shaped box 41. The traction link 48 connects the central pivot 310 and the arc-shaped outer guide rod 47. The arc-shaped outer guide rod 47 is located on one side of the outer periphery of the casing 33, and its inner surface has a gradually decreasing inner arc surface with a gradually decreasing radius of curvature. The return spring 46 is sleeved on the displacement rod 45, and its two ends abut against the outer surface of the waist-shaped box 41 and the end of the displacement rod 45, respectively. Under the elastic pushing action of the return spring 46, the end of the displacement rod 45 always remains in contact with the gradually decreasing inner arc surface of the arc-shaped outer guide rod 47.

[0041] When the central pivot 310 rotates, the central pivot 310 drives the arc-shaped outer guide rod 47 to rotate circumferentially synchronously through the traction link 48. During this process, the end of the displacement rod 45 slides relative to the tapered inner arc surface and is subjected to the radially inward pushing force of the tapered inner arc surface. This pushing force drives the displacement rod 45 to overcome the elastic force of the return spring 46 and generate a linear displacement in the horizontal direction, thereby driving the heating module 44 to move along the slide rail 411. Through the rotation of the arc-shaped outer guide rod 47, the heating module 44 switches positions between the first heating station and the second heating station. This structure uses a single power source to simultaneously complete the position reversal of the dehumidification box, the opening and closing of the air vents of the heating station, and the displacement compensation of the heating heat source.

[0042] Furthermore, to prevent the spread of smoke and fire along the piping in the event of a malfunction in a specific compartment, fire dampers are installed at the connection interfaces between the dual-chamber piping assembly 2 and each compartment of the cabinet 1. These fire dampers contain a fusible link and a mechanical spring. When a malfunction occurs inside the corresponding compartment, causing an abnormal rise in ambient temperature that reaches the fusible link threshold (e.g., exceeding 150°C), the internal fusible link breaks, and the fire damper is instantly closed by the tension of the mechanical spring. By physically cutting off the connection path between each high-voltage compartment and the dual-chamber piping assembly 2, these fire dampers ensure the sealing independence of the instrument room 11, busbar room 12, circuit breaker room 13, and cable room 14 under extreme fault conditions, thus guaranteeing the operational safety of the entire cabinet.

[0043] Working Principle: Under normal dehumidification conditions, the control system activates the exhaust fan in the exhaust stack 34, creating negative pressure in the exhaust chamber of the dual-chamber pipe assembly 2. Moist air from the instrument compartment 11, busbar compartment 12, circuit breaker compartment 13, and cable compartment 14 inside the cabinet 1 is extracted through corresponding branch pipes and converges in the dual-chamber main pipe 23, flowing downwards. The moist airflow enters the dehumidification assembly 3, passes through the main dehumidification box 35 at the dehumidification station, and exchanges moisture through the adsorbent material inside. The dried airflow is then pressurized by the fan in the intake stack 37, transported upwards along the intake chamber of the dual-chamber main pipe 23, and returned to the far end of each compartment through each deep intake pipe. Due to the spatial span between the deep intake pipe and the exhaust port, a large-scale air convection is formed inside each compartment. Combined with the resistance preset of the flow regulating valve, uniform and efficient dehumidification circulation in each independent high-pressure compartment is achieved without damaging the physical isolation barrier of the entire cabinet.

[0044] When the humidity sensor detects that the main dehumidifier box 35 is saturated with moisture, the control system triggers a switching program, driving the forward and reverse motors 39 to rotate the central pivot 310 90 degrees in the forward direction. During this process, the main dehumidifier box 35 rotates from the dehumidification station to the second heating station, while the standby dehumidifier box 36 simultaneously rotates to the dehumidification station to take over the operation, ensuring that the dehumidification process is uninterrupted. At the same time, the drive gear 312 on the central pivot 310 drives the transmission rack 314 to move in the opposite direction, causing the two sets of shielding plates 315 to move synchronously. This action closes the first heating station, which is in an empty state, and opens the second heating station, which carries the main dehumidifier box 35. Through this purely mechanical linkage, while completing the reversal of the dehumidification body, the opening and closing of the bottom air passage is automatically adjusted, providing a sealed physical basis for subsequent heating and regeneration, and effectively preventing the ineffective diffusion of heat and moisture.

[0045] While the dehumidifier box is being repositioned, the central pivot 310 drives the arc-shaped outer guide rod 47 to rotate circumferentially via the traction link 48. The displacement rod 45 is radially pushed by the gradually narrowing inner arc surface of the arc-shaped outer guide rod 47, overcoming the elastic force of the return spring 46, and driving the heating module 44 to move horizontally along the slide rail 411, suspending it above the main dehumidifier box 35 located in the second heating station, thus achieving automatic tracking and compensation of the heat source. After the heating program starts, the centrifugal fan 443 draws in outside air through the filter screen 43 and heats it up by the heating element 442, forming a high-temperature hot airflow that blows downwards to sweep the dehumidifier box. The desorbed hot and humid airflow is discharged through the casing 33. Throughout the process, the temperature protection switch monitors the heating station in real time, and forcibly cuts off the power if the temperature exceeds the limit. In addition, the fire dampers at each pipe interface act as a safety barrier, automatically melting and closing when extreme faults such as arcing occur in the compartment, causing a temperature rise, physically blocking the connection path between the compartments, and ensuring the safety of the entire cabinet.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An armored withdrawable AC metal-enclosed switchgear, characterized in that, include The cabinet (1) has multiple high-voltage compartments inside; The dual-cavity pipeline assembly (2) is fixed outside the cabinet (1) and connected to each of the high-pressure compartments, and is used to form an independently isolated air intake channel and exhaust channel outside the cabinet (1); The dehumidification component (3) is located at the bottom of the dual-cavity pipeline component (2) and includes a ventilation unit, multiple dehumidification boxes and a switching unit. The ventilation unit is used to connect the dual-cavity pipeline component (2) to form a fixed channel for airflow in and out. The switching unit is used to drive the dehumidification box to alternate between the dehumidification station and the heating station. The heating and regeneration component (4) is disposed on the top of the dehumidification component (3) and is connected to the switching unit for linkage with the switching unit and sliding between the corresponding heating stations to heat and dry the dehumidification box at the corresponding heating station.

2. The armored withdrawable AC metal-enclosed switchgear according to claim 1, characterized in that, The plurality of dehumidifier boxes include a main dehumidifier box (35) and a spare dehumidifier box (36). The ventilation unit includes a third Y-shaped connector (31), a housing (33), a bottom cover plate (331), an exhaust pipe (34), and an intake pipe (37). The third Y-shaped connector (31) is connected to the bottom end of the dual-chamber piping assembly (2), and its interior is divided into two connector ends (32) by a pipe partition (301). The housing (33) is connected to the bottom end of the two connector ends (32). The bottom cover plate (33) 1) It is detachably connected to the bottom of the housing (33). The upper surface of the housing (33) and the bottom cover plate (331) are provided with four corresponding first through holes (332) and second through holes (333) at equal intervals of 90 degrees. The exhaust pipe (34) is fixed on the bottom cover plate (331) and corresponds to one of the through holes. One end of the exhaust pipe (34) extends downward through the bottom cover plate (331). The exhaust pipe (34) is provided with an exhaust fan for exhausting the exhaust gas outward. The main dehumidifier box (35) and the spare dehumidifier box (36) are both placed on the bottom cover plate (331) and have corresponding through holes on the top and bottom. The spare dehumidifier box (36) is located between the main dehumidifier box (35) and the exhaust pipe (34). The air inlet pipe (37) is fixed on the bottom surface of the bottom cover plate (331) and is set in relation to the main dehumidifier box (35). The air inlet pipe (37) is equipped with a fan for supplying dry airflow into the cabinet.

3. The armored withdrawable AC metal-enclosed switchgear according to claim 2, characterized in that, The switching unit includes a mounting cover (38), a forward and reverse motor (39), and a central pivot (310). The mounting cover (38) is fitted onto the exhaust pipe (34) and the air inlet pipe (37) and is connected to the bottom surface of the bottom cover (331) by fasteners. The forward and reverse motor (39) is fixed to the bottom surface of the mounting cover (38) and is used to achieve only 90 degrees forward or 90 degrees reverse rotation each time. The central pivot (310) is vertically rotatably set at the center position of the bottom cover (331) and is connected to the main dehumidifier box (35) and the spare dehumidifier box (36) through a connecting plate, and is connected to the output end of the forward and reverse motor (39).

4. The armored withdrawable AC metal-enclosed switchgear according to claim 3, characterized in that, The switching unit also includes a drive gear (312), a limiting sleeve (313), a transmission rack (314), and a shielding plate (315). The drive gear (312) is disposed on the bottom surface of the bottom cover plate (331) and fixedly sleeved on the central pivot (310). The limiting sleeve (313) is symmetrically fixed on the surfaces of the air inlet (37) and the exhaust pipe (34). There are two symmetrically arranged transmission racks (314), both of which mesh with the drive gear (312). The transmission rack (314) is slidably disposed between the two limiting sleeves (313) located in a row. The shielding plate (315) is fixed to the side of the two transmission racks (314) that are far apart from each other by a bracket. In addition to the two through holes corresponding to the exhaust pipe (34) and the air inlet (37), the bottom cover plate (331) has two other symmetrically distributed through holes that define the first heating station and the second heating station, respectively. In the initial state, one of the shielding plates (315) closes the second heating station, and the other shielding plate (315) avoids the first heating station so that it is in an open state. When the drive gear (312) rotates and drives the two transmission racks (314) to move in opposite directions, the two shielding plates (315) slide synchronously to close the first heating station and open the second heating station.

5. The armored withdrawable AC metal-enclosed switchgear according to claim 4, characterized in that, The heating and regeneration assembly (4) includes a waist-shaped box (41), a cover plate (42), and a heating module (44). The waist-shaped box (41) is fixed on the upper surface of the housing (33), and its two ends are above the first heating station and the second heating station. The cover plate (42) is detachably covered on the waist-shaped box (41), and both ends of the cover plate have filters (43). The inner walls of the waist-shaped box (41) are provided with slide rails (411). The heating module (44) is slidably disposed inside the waist-shaped box (41), and its two sides are fixed with sliding pins (441) and slide in the slide rails (411). The heating module (44) has an air supply cavity that runs through the top and bottom. Inside the cavity, a centrifugal fan (443) and a heating element (442) are arranged sequentially from top to bottom. The centrifugal fan (443) forces the air drawn in through the upper filter (43) downward through the heating element (442) to form a high-temperature dry airflow blown downward.

6. The armored withdrawable AC metal-enclosed switchgear according to claim 5, characterized in that, The heating and regeneration assembly (4) also includes a displacement rod (45), a reset spring (46), an arc-shaped outer guide rod (47), and a traction link (48). The displacement rod (45) is horizontally fixed to the side of the heating module (44) and moves through one end of the waist-shaped box (41). The traction link (48) connects the central pivot (310) and the arc-shaped outer guide rod (47). The arc-shaped outer guide rod (47) is located on one side of the outer periphery of the shell (33), and its inner side is a gradually narrowing inner arc surface with a gradually decreasing radius of curvature. The reset spring (46) is sleeved on the displacement rod (45), and its two ends are respectively connected to the outer surface of the waist-shaped box (41) and the inner wall of the arc-shaped outer guide rod (47). Under the action of the reset spring (46), the displacement rod (45) is always in contact with the inner arc surface of the arc-shaped outer guide rod (47). When the central pivot (310) drives the arc-shaped outer guide rod (47) to rotate circumferentially, the end of the displacement rod (45) is gradually pushed by the tapered inner arc surface and overcomes the elastic force of the reset spring (46) to generate linear displacement, so as to drive the heating module (44) to slide along the slide (411) between the first heating station and the second heating station.

7. The armored withdrawable AC metal-enclosed switchgear according to claim 1, characterized in that, The cabinet (1) is divided into an independent instrument room (11), busbar room (12), circuit breaker room (13) and cable room (14) by metal partitions.

8. The armored withdrawable AC metal-enclosed switchgear according to claim 7, characterized in that, The dual-cavity pipeline assembly (2) includes a fixed bracket (21), a U-shaped clamp (22), a dual-cavity main pipe (23), and a main pipe partition (210). Several fixed brackets (21) are provided and fixed on the outer side of the cabinet (1). The U-shaped clamp (22) is fixed on the fixed bracket (21) by nuts. The dual-cavity main pipe (23) is fixed in the pipe clamp formed by the fixed bracket (21) and the U-shaped clamp (22) and is arranged vertically. The main pipe partition (210) is arranged axially inside the dual-cavity main pipe (23) to divide the dual-cavity main pipe (23) into an independent air inlet cavity and an air outlet cavity.

9. The armored withdrawable AC metal-enclosed switchgear according to claim 8, characterized in that, The dual-cavity piping assembly (2) further includes two side branch pipes (24), two first Y-shaped connectors (25), and two first deep air inlet pipes (251). The two side branch pipes (24) are respectively located at the upper and lower ends of the dual-cavity main pipe (23), and a partition plate is provided inside them corresponding to the main pipe partition (210). The first Y-shaped connectors (25) are respectively connected to one end of the corresponding side branch pipe (24). The first Y-shaped connector (25) is divided into an air inlet port and an air outlet port by the partition plate along its two branch pipe ends. The first Y-shaped connector (25) located at the upper end is connected to the busbar chamber (12), and the first Y-shaped connector (25) located at the lower end is connected to the circuit breaker chamber (13). The first deep air inlet pipes (251) are respectively connected to the air inlet port of the corresponding first Y-shaped connector (25) to send airflow into the corresponding chamber.

10. The armored withdrawable AC metal-enclosed switchgear according to claim 9, characterized in that, The dual-cavity pipeline assembly (2) further includes a middle branch pipe (26), a tee pipe (27), two second Y-shaped connectors (28), and two second deep air inlet pipes (29). The middle branch pipe (26) is connected to the surface of the dual-cavity main pipe (23), and a partition plate is provided inside it corresponding to the main pipe partition (210). The tee pipe (27) is connected to one end of the middle branch pipe (26). The two second Y-shaped connectors (28) are respectively connected to the two ends of the tee pipe (27). The interior of the second Y-shaped connector (28) is divided into an air inlet port and an air outlet port along its two branch pipe ends by the partition plate. The second Y-shaped connector (28) located at the upper end is connected to the instrument room (11), and the second Y-shaped connector (28) located at the lower end is connected to the cable room (14). The two second deep air inlet pipes (29) are respectively connected to the air inlet ports of the two second Y-shaped connectors (28) for sending airflow into the corresponding chamber.

Images