A 20kV full-insulation intelligent ring main unit anti-condensation dehumidification device and a control method thereof

Abstract

The present application relates to the technical fields of intelligent ring network cabinet, in particular to a 20kV full insulation intelligent ring network cabinet anti-condensation dehumidification device and a control method thereof, the 20kV full insulation intelligent ring network cabinet anti-condensation dehumidification device is arranged in the cabinet body, the side and top of the cabinet body are respectively provided with exhaust port and air inlet; the exhaust port and air inlet are respectively provided with switching mechanism and filter; the cabinet body is provided with electric push rod, the movable end of the electric push rod is fixed with vertical rod, the electric push rod and the dehumidification mechanism connected with the switching mechanism are communicated with the humidity sensor arranged in the cabinet body; when the humidity in the cabinet body exceeds the preset threshold, the electric push rod works, the exhaust port is turned on, the filter is opened, the filter is arranged, the new air introduced into the cabinet body meets the clean requirement, the trigger mechanism is arranged, before the filter is opened, the trigger mechanism can blow out the gas in the cylinder to the outside of the cabinet body through the filter, and the impurities in the filter can be blown out.

Description

Technical Field

[0001] This invention relates to the technical field of intelligent ring main units, specifically a 20kV fully insulated intelligent ring main unit anti-condensation dehumidification device and its control method. Background Technology

[0002] A ring main unit (RMU) is an electrical device used in medium-voltage power distribution networks, primarily for power distribution and control. Through modular design, RMUs achieve reliable power distribution and fault protection, and are widely used in urban power distribution networks, industrial areas, and residential areas. RMUs are typically installed outdoors, especially in high-humidity regions or outdoors, where moisture in the air can easily enter the cabinet through poorly sealed gaps, leading to increased internal humidity and potentially condensation. In such cases, the accumulation of moisture reduces the insulation performance of the components inside the cabinet, increasing the risk of short circuits and faults.

[0003] To address this, some ring main units are equipped with dehumidifiers to expel humid air and introduce fresh air. To prevent impurities and dust in the fresh air from adversely affecting the components inside, a filter is installed at the fresh air inlet. However, since ring main units are typically installed outdoors, over time, impurities filtered out during dehumidification can remain in the filter. Furthermore, impurities and even foreign objects from the outside air may enter the filter, causing it to become clogged during dehumidification, hindering the introduction of fresh air. Although the filter elements themselves impede airflow, severe clogging can cause negative pressure to form inside the unit due to the suction of the exhaust fan. Air may then enter through unfiltered pathways (such as gaps in the unit or unsealed areas), carrying dust and other pollutants. Dust and impurities are present in the air; therefore, some dehumidifiers are equipped with a mechanism that blows out impurities and foreign objects that may be present in the filter before the fresh air is introduced, which could cause problems during the subsequent dehumidification process. Specifically, an air pump is used to blow out dust and foreign objects from the filter before dehumidification. However, if the air source of the pump is external air, it will cause the filter to become contaminated, achieving the opposite purification effect. Alternatively, the air source may be gas from inside the ring main unit. However, if the humidity inside the ring main unit is high, it can easily cause the components in the filter to become wet, making it difficult to remove impurities and dust and increasing the adhesion of impurities and dust. If a dedicated gas storage tank is provided, it will occupy the internal space of the ring main unit, and in order to prevent the gas in the storage tank from running out, it needs to be checked regularly, increasing the workload of maintenance.

[0004] Therefore, some dehumidifiers are equipped with a cylindrical structure that uses a piston pump to blow out the previously introduced fresh air in the opposite direction of the fresh air inlet passage. To ensure the blowing effect, the piston needs to have a relatively fast movement speed. However, since the piston's stroke is limited, its movement time is short. Soon after, the dehumidification process begins, that is, the fresh air inlet passage is opened. At this time, the dust dispersed above filter 2 has not been completely dispersed. Therefore, a considerable amount of dust will be carried back into the filter by the fresh air, resulting in poor blowing effect and adversely affecting the dehumidification process. Summary of the Invention

[0005] The purpose of this invention is to provide a 20kV fully insulated intelligent ring main unit anti-condensation dehumidification device and its control method to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a 20kV fully insulated intelligent ring main unit anti-condensation dehumidification device, disposed within the cabinet, wherein the side and top of the cabinet are respectively provided with an exhaust port and an air inlet; wherein the exhaust port and the air inlet are respectively provided with a switching mechanism and a filter; an electric push rod is installed inside the cabinet, the movable end of the electric push rod is fixed with a vertical rod, the electric push rod and the dehumidification mechanism connected to the switching mechanism communicate with a humidity sensor disposed within the cabinet; when the humidity inside the cabinet exceeds a preset threshold, the electric push rod operates, causing the switching mechanism to open the exhaust port, the filter to open, forming a gas flow path inside the cabinet, and a cylinder is also fixed inside the cabinet, and before the filter opens, a triggering mechanism disposed within the cabinet can blow the gas in the cylinder through the filter to the outside of the cabinet.

[0007] As a further aspect of the present invention: the switching mechanism includes a first disc fixed inside the exhaust port and a second disc rotatably connected to the first disc via a shaft pin. The first disc and the second disc are sealed and slidably fitted together, and both have multiple openings equidistantly arranged along the circumference. The electric push rod can drive the second disc to rotate relative to the first disc through a sliding fit structure, so that the openings on the first disc and the second disc coincide or are offset.

[0008] As a further embodiment of the present invention: the sliding fit structure includes a fixed post fixed to the movable end of the electric push rod and a support arm fixed to the edge of the second disc body. The support arm is provided with a strip-shaped through groove adapted to the fixed post, and the fixed post passes through the strip-shaped through groove and is slidably connected to the support arm.

[0009] As a further embodiment of the present invention: the dehumidification mechanism includes a pipe fixedly installed in the cabinet and an exhaust fan fixedly connected to the pipe. A cover is fixed to one end of the exhaust fan away from the pipe, and the cover is rotatably and sealingly connected to the second plate.

[0010] As a further embodiment of the present invention: the cylinder is located below the filter, and a telescopic structure is provided between the two. The telescopic structure cooperates with the upright, and during the latter part of the stroke of the upright, it can cause the telescopic structure to perform a shortening action.

[0011] As a further embodiment of the present invention: the telescopic structure includes a bellows connected to the filter and a cover fixed to the end of the bellows away from the filter. The cover is fixedly connected to a follower column, and the upright can push the cover to separate from the cylinder through the follower column, thereby causing the bellows to contract.

[0012] As a further embodiment of the present invention: a rotating shaft is rotatably installed on the inner wall of the cabinet, and the triggering mechanism includes a piston that is sealed and slidably disposed in the cylinder and a follower arm fixed at the head end of the rotating shaft. A transmission arm is provided between the follower arm and the piston; wherein, the two ends of the transmission arm are respectively hinged to the piston and the follower arm, and the follower arm is also connected to an elastic structure that cooperates with the upright.

[0013] As a further embodiment of the present invention: the elastic structure includes a guide cylinder fixed to the tail end of the rotating shaft and a telescopic rod slidably fitted with the guide cylinder. The guide cylinder is also provided with a spring, one end of which is connected to the inner wall of the guide cylinder; wherein, the other end of the spring is connected to the head end of the telescopic rod, the tail end of the telescopic rod is also provided with a pulley, and an "L"-shaped track is fixedly provided inside the cabinet, with the pulley abutting against the track.

[0014] As a further embodiment of the present invention: a second protruding post and a first protruding post are fixed on the upright post, and the guide cylinder is located between the first protruding post and the second protruding post.

[0015] A control method for the 20kV fully insulated intelligent ring main unit anti-condensation dehumidification device includes the following steps:

[0016] Step 1: The humidity sensor monitors the air humidity inside the cabinet;

[0017] Step 2: When the humidity exceeds the preset threshold, the electric actuator will activate.

[0018] Step 3: Trigger the mechanism to blow the gas in the cylinder through the filter to the outside of the cabinet;

[0019] Step four: Open the exhaust vent and filter, the dehumidification mechanism will work, the humid air inside the cabinet will be drawn out of the cabinet through the exhaust vent, and fresh air will be introduced into the cabinet through the filter.

[0020] Compared with the prior art, the beneficial effects of this invention are as follows: This application installs a humidity sensor inside the cabinet to monitor the humidity in real time. When the humidity inside the cabinet exceeds a preset threshold, the movement of the electric push rod can automatically open the exhaust port and filter, achieving intelligent control. The filter ensures that the fresh air introduced into the cabinet meets cleanliness requirements. A trigger mechanism is included; before the filter opens, the trigger mechanism blows the gas in the cylinder through the filter to the outside of the cabinet, removing any impurities or foreign objects that may be present in the filter. This prevents blockage of the filter during subsequent dehumidification, which would hinder the introduction of fresh air into the cabinet, leading to negative pressure inside the cabinet and forcing air to enter through other unfiltered paths, carrying dust and impurities and affecting the working performance of the ring main unit. Furthermore, during the downward movement of the upright, the separation process between the upright and the follower column occurs before the second protrusion contacts the guide cylinder. Therefore, before the piston resets, the bellows will complete its elastic elongation, i.e., the cover and the top of the cylinder... When the end returns to the sealed docking state, and the piston moves downward to reset, a portion of fresh air can be drawn into the cylinder to achieve automatic gas storage. This ensures that the gas source used for blowing away impurities and foreign objects meets the requirements. Gas storage is performed automatically after dehumidification, eliminating the need for a separate storage tank to store compliant gas, thus effectively reducing maintenance workload. The triggering mechanism described in this application allows the guide cylinder and telescopic rod to initially sway upwards until they are perpendicular to the track. During this process, the piston slides slowly within the cylinder. Once the guide cylinder and telescopic rod have passed the position perpendicular to the track, the rapid rebound of the spring allows the piston to move quickly upwards within the guide cylinder, thus achieving the "slow first, fast later" characteristic of the blowing process. This "slow first, fast later" blowing approach provides a longer diffusion time for dust with low adhesion, allowing it to disperse fully above the filter, minimizing the impact of fresh airflow during dehumidification, and preventing excessive dust from re-entering the filter 2, which would result in poor blowing performance. Attached Figure Description

[0021] Figure 1 A schematic diagram of the structure of an embodiment of a 20kV fully insulated intelligent ring main unit anti-condensation dehumidification device;

[0022] Figure 2 A schematic diagram of another angle of one embodiment of the anti-condensation and dehumidification device for a 20kV fully insulated intelligent ring main unit;

[0023] Figure 3A schematic diagram of the internal structure of the cabinet in one embodiment of the anti-condensation and dehumidification device for a 20kV fully insulated intelligent ring main unit;

[0024] Figure 4 This is a schematic diagram of the internal structure of the cabinet from another angle in one embodiment of the anti-condensation and dehumidification device for a 20kV fully insulated intelligent ring main unit.

[0025] Figure 5 This is a schematic diagram of the internal structure of the cabinet at another angle in one embodiment of the anti-condensation and dehumidification device for a 20kV fully insulated intelligent ring main unit.

[0026] Figure 6 for Figure 4 Enlarged view of the structure at point A in the middle;

[0027] Figure 7 for Figure 4 Enlarged view of the structure at point B;

[0028] Figure 8 An exploded view of the switching mechanism in one embodiment of the anti-condensation and dehumidification device for a 20kV fully insulated intelligent ring main unit;

[0029] Figure 9 for Figure 8 A structural diagram from another angle;

[0030] Figure 10 An exploded view of the triggering mechanism in one embodiment of the anti-condensation and dehumidification device for a 20kV fully insulated intelligent ring main unit.

[0031] In the diagram: 1. Cabinet; 2. Filter; 3. Shaft pin; 4. First tray; 5. Second tray; 501. Support arm; 6. Track; 7. Cover; 8. Exhaust fan; 9. Pipe; 10. Corrugated pipe; 11. Cover; 1101. Follower column; 12. Cylinder; 13. Piston; 14. Transmission arm; 15. Follower arm; 16. Guide cylinder; 17. Telescopic rod; 18. Spring; 19. Electric push rod; 1901. Fixed column; 20. Upright pole; 2001. First protruding column; 2002. Second protruding column; 21. Rotating shaft. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Furthermore, elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0034] Please see Figures 1-10 In this embodiment of the invention, a 20kV fully insulated intelligent ring main unit anti-condensation dehumidification device is installed inside the cabinet 1. The side and top of the cabinet 1 are respectively provided with an exhaust port and an air inlet. The exhaust port and air inlet are respectively provided with a switching mechanism and a filter 2. An electric push rod 19 is installed inside the cabinet 1. The movable end of the electric push rod 19 is fixed with a vertical rod 20. The electric push rod 19 and the dehumidification mechanism connected to the switching mechanism communicate with a humidity sensor installed inside the cabinet 1. When the humidity inside the cabinet 1 exceeds a preset threshold, the electric push rod 19 operates, causing the switching mechanism to open the exhaust port and the filter 2 to open, forming a gas flow path inside the cabinet 1. A cylinder 12 is also fixed inside the cabinet 1. Before the filter 2 is opened, a triggering mechanism installed inside the cabinet 1 can blow the gas in the cylinder 12 out of the cabinet 1 through the filter 2.

[0035] Furthermore, during daily operation, the humidity sensor inside the ring main unit monitors the internal humidity in real time. Operators set a humidity threshold based on the unit's performance. When the humidity inside cabinet 1 exceeds this threshold, condensation is likely to occur, which is detrimental to the normal operation of internal electrical components. Therefore, it is necessary to remove the humid air promptly. To address this, the humidity sensor sends a control signal, causing the electric push rod 19 and the dehumidification mechanism to operate sequentially. The electric push rod 19 drives the upright rod 20 to rise. During this process, the upright rod 20 first triggers the trigger mechanism to move. Air will be introduced into filter 2 and discharged outside the cabinet 1 to prevent foreign objects from entering filter 2 and causing blockage during subsequent exhaust. Therefore, before each moisture removal, the triggering mechanism can prevent filter 2 from becoming blocked, avoiding severe blockage and air entering the cabinet through other unfiltered paths, such as through gaps in the cabinet 1, which would adversely affect the ring network cabinet. In addition, if filter 2 is severely blocked, the dehumidification mechanism may create negative pressure inside the cabinet 1, which will force air to enter the cabinet through other unfiltered paths, thus carrying dust and impurities.

[0036] After the triggering mechanism finishes its operation, the switching mechanism switches the blocked state of the exhaust port to the open state. The upright 20 opens the filter 2, and then the dehumidification mechanism operates, allowing the humid air inside the cabinet 1 to be discharged through the exhaust port, while fresh air is introduced into the cabinet 1 through the filter 2. This achieves automatic adjustment of the humidity inside the cabinet 1, ensuring the normal operation of the ring main unit. It should be noted that in practical applications, the cabinet 1 should also be equipped with a temperature sensor to monitor the temperature inside the cabinet 1 in real time. Similarly, a temperature threshold should be set to promptly discharge the hot air inside the cabinet 1 and introduce fresh air to achieve a heat dissipation effect, preventing the internal temperature of the ring main unit from becoming too high and adversely affecting its performance.

[0037] It is important to emphasize that, to avoid excessive humidity in the environment where the ring main unit is located, the fresh air must be dried before being introduced into the unit 1 to ensure that the humidity of the incoming fresh air meets the requirements. Therefore, the filter 2 is equipped with a desiccant. When the fresh air passes through the filter 2, it first passes through the internal filter screen, which effectively removes dust and impurities carried in the fresh air, preventing these particles from entering the unit 1 and damaging electrical components or affecting the normal operation of the equipment.

[0038] After filtration, the fresh air continues to flow through the desiccant. The main function of the desiccant is to adsorb moisture in the fresh air, separating the moisture from the air through physical or chemical adsorption. Desiccants typically have a porous structure, which significantly increases their adsorption surface area, thereby efficiently removing moisture from the air. This process not only reduces the humidity of the fresh air but also ensures that the fresh air entering cabinet 1 is dry and clean, thus providing a stable operating environment for the electrical components inside cabinet 1.

[0039] Furthermore, to prevent excessively high temperatures from adversely affecting the operation of equipment within cabinet 1, a cooling mechanism can be installed in cabinet 1. The function of the cooling mechanism is to regulate the temperature of the incoming fresh air, ensuring it remains within a suitable range. Cooling mechanisms typically employ heat exchange principles, lowering the fresh air temperature by exchanging heat with a cooling medium. This design not only prevents damage to the equipment from high temperatures but also further optimizes the temperature and humidity environment within cabinet 1, ensuring the equipment operates under optimal conditions.

[0040] Through filtration and drying by filter 2, and temperature regulation by the cooling system, the ring main unit can effectively cope with high humidity and high temperature environments, ensuring the quality of fresh air and the stable operation of the equipment inside. These designs not only improve the reliability of the equipment but also extend its service life, providing a guarantee for the long-term use of the ring main unit in complex environments.

[0041] Please refer to it again. Figure 2 , Figure 5 as well as Figure 9 The switching mechanism includes a first disc 4 fixed inside the exhaust port and a second disc 5 rotatably connected to the first disc 4 via a shaft pin 3. The first disc 4 and the second disc 5 are sealed and slidably fitted together, and both have multiple openings equidistantly arranged along the circumference. The electric push rod 19 can drive the second disc 5 to rotate relative to the first disc 4 through a sliding fit structure, so that the openings on the first disc 4 and the second disc 5 coincide or are staggered.

[0042] Please refer to it again. Figure 6 and Figure 9 The sliding fit structure includes a fixed post 1901 fixed to the movable end of the electric push rod 19 and a support arm 501 fixed to the edge of the second disc 5. The support arm 501 is provided with a strip-shaped through groove adapted to the fixed post 1901. The fixed post 1901 passes through the strip-shaped through groove and is slidably connected to the support arm 501 when it moves with the movable end of the electric push rod 19.

[0043] Specifically, when the humidity sensor inside the cabinet 1 detects that the humidity inside the cabinet 1 exceeds a preset threshold, the temperature sensor sends a control signal to the electric push rod 19. The electric push rod 19 then extends, causing the fixed column 1901 to rise vertically. During this process, the fixed column 1901 slides with the support arm 501 through the strip groove on the support arm 501, causing the support arm 501 to deflect. Correspondingly, the second disc 5 rotates relative to the first disc 4. After the movement of the electric push rod 19 ends, the openings on the second disc 5 and the first disc 4 change from a staggered state to an overlapping state. Therefore, the exhaust port is open, and when the dehumidification mechanism is working, it can draw the humid air inside the cabinet 1 to the outside of the cabinet 1 through the opening, realizing the intelligent dehumidification function and avoiding condensation caused by excessive humidity inside the cabinet 1, which would affect the normal operation of the ring main unit.

[0044] Please refer to it again. Figure 5 , Figure 8 as well as Figure 9 The dehumidification mechanism includes a pipe 9 fixedly installed inside the cabinet 1 and an exhaust fan 8 fixedly connected to the pipe 9. A cover 7 is fixed to one end of the exhaust fan 8 away from the pipe 9, and the cover 7 is rotatably and sealed to the second plate 5.

[0045] Specifically, the exhaust fan 8 includes a mounting frame, fan blades that are rotatably mounted in the mounting frame, and a drive motor that is fixed in the mounting frame and whose output end is connected to the fan blade rotation shaft. The pipe 9 and the cover 7 are fixed to the mounting frame.

[0046] Once both the exhaust port and the air inlet are connected, the exhaust fan 8 will begin operation. The exhaust fan 8 draws in humid air from inside the cabinet 1 through the pipe 9. The humid air is first guided into the pipe 9 and flows along its path. Subsequently, the humid air is discharged outside the cabinet 1 through the cover 7 and the openings on the second tray 5 and the first tray 4, thus achieving the dehumidification function.

[0047] In this process, it is particularly important to note that to prevent humid air from entering the drive motor of the exhaust fan 8 through pipe 9 during dehumidification and adversely affecting its operation, corresponding protective measures are incorporated into the design. Specifically, a protective shell (not labeled in the figure) is provided on the mounting frame of the exhaust fan 8. This protective shell effectively blocks humid air from entering the internal area of ​​the drive motor, thereby ensuring stable operation of the drive motor during dehumidification and preventing short circuits, corrosion, or other potential mechanical failures caused by moisture intrusion. This design not only improves the reliability of the equipment but also extends the service life of the exhaust fan 8, ensuring that the ring main unit can continuously and effectively dehumidify during long-term operation.

[0048] Please refer to it again. Figure 7 The cylinder 12 is located below the filter 2, and a telescopic structure is provided between them. The telescopic structure cooperates with the upright 20. During the later part of the upward stroke of the upright 20, the telescopic structure can cause the telescopic structure to perform a shortening action. The telescopic structure includes a bellows 10 connected to the filter 2 and a cover 11 fixed to the end of the bellows 10 away from the filter 2. The cover 11 is fixedly connected to a follower column 1101. The upright 20 can push the cover 11 to separate from the cylinder 12 through the follower column 1101, and cause the bellows 10 to contract.

[0049] Furthermore, with attachment Figure 7Taking the illustrated state as an example, at this time, the upright 20 and the follower column 1101 are in a separated state. Under the gravity of each component and the elastic force of the bellows 10 (similar to a spring), the cover 11 and the upper end of the cylinder 12 are sealed and abutted together, and the openings on the first disc 4 and the second disc 5 are staggered. During the process of the electric push rod 19 driving the upright 20 to rise, before the upright 20 contacts the follower column 1101, the upright 20 causes the trigger mechanism to move. The trigger mechanism can lift the gas in the cylinder 12 upward, so the gas in the cylinder 12 is discharged to the outside of the cabinet 1 through the filter 2, which can blow out any foreign objects that may be present in the filter 2 and prevent subsequent discharge. When wet, foreign objects clog the filter 2, making it difficult for fresh air to be introduced into the cabinet 1 through the filter 2. This leads to a negative pressure inside the cabinet 1, which causes air to enter the cabinet through other unfiltered paths, carrying dust and impurities and affecting the working performance of the ring main unit. After the upright 20 contacts the follower column 1101, the upright 20 will apply a pushing force to the follower column 1101 and the cover 11, thereby separating the cover 11 from the cylinder 12. The corrugated pipe 10 will contract, and fresh air can be smoothly introduced into the cabinet 1. After the upright 20 stops rising, the openings on the first plate 4 and the second plate 5 will be in an overlapping state, forming an effective gas flow path inside the cabinet 1, so that fresh air is introduced while dehumidifying.

[0050] Please refer to it again. Figure 7 and Figure 10 A rotating shaft 21 is rotatably mounted on the inner wall of the cabinet 1. The triggering mechanism includes a piston 13 that is slidably sealed in the cylinder 12 and a follower arm 15 fixed at the head end of the rotating shaft 21. A transmission arm 14 is provided between the follower arm 15 and the piston 13. The two ends of the transmission arm 14 are respectively hinged to the piston 13 and the follower arm 15. The follower arm 15 is also connected to an elastic structure that cooperates with the upright 20.

[0051] The elastic structure includes a guide cylinder 16 fixed to the tail end of the rotating shaft 21 and a telescopic rod 17 slidably fitted with the guide cylinder 16. A spring 18 is also provided inside the guide cylinder 16, with one end of the spring 18 connected to the inner wall of the guide cylinder 16. The other end of the spring 18 is connected to the head end of the telescopic rod 17, and a pulley is provided at the tail end of the telescopic rod 17. An "L"-shaped track 6 is fixed inside the cabinet 1, with the pulley abutting against the track 6. A second protruding post 2002 and a first protruding post 2001 are fixed vertically distributed on the upright 20, and the guide cylinder 16 is located between the first protruding post 2001 and the second protruding post 2002.

[0052] When the electric push rod 19 drives the upright 20 to rise, the first protrusion 2001 and the second protrusion 2002 rise together with the upright 20. First, the first protrusion 2001 gradually approaches the guide cylinder 16. After the first protrusion 2001 contacts the guide cylinder 16, it pushes the guide cylinder 16 to swing upward. During the process of the guide cylinder 16 swinging to the horizontal position, under the limiting action of the track 6 (that is, the process of the guide cylinder 16 and the telescopic rod 17 gradually becoming perpendicular to the track 6), the telescopic rod 17 gradually slides towards the inside of the guide cylinder 16, and the compression of the spring 18 increases. After the guide cylinder 16 passes the horizontal position, the spring 18 rebounds, and the pulley will roll rapidly upward along the track 6. Correspondingly, the guide cylinder 16 drives the follower arm 15 to swing rapidly upward, and the follower arm 1... 5. The piston 13 is driven to rise rapidly in the cylinder 12 by the transmission arm 14. It should be noted that during the above process, the upright 20 and the follower column 1101 have not yet come into contact. Therefore, the cover 11 and the upper end of the cylinder 12 are in a sealed docking state. Taking advantage of the instantaneous rebound of the spring 18, the rapidly rising piston 13 can promote a faster airflow to impact and remove dust and foreign objects in the filter 2, avoiding the problem of poor dehumidification caused by the filter 2 being blocked during subsequent dehumidification. After the dehumidification process is completed, the electric push rod 19 drives the upright 20 to move down until all components are reset. During this process, the second protrusion 2002 will push the guide cylinder 16 to deflect downward, causing the spring 18 to be compressed. After the guide cylinder 16 passes the horizontal position, the pulley of the "L"-shaped track 6 is limited.

[0053] Of course, some existing devices are also equipped with corresponding air pumps to remove dust and foreign objects from the filter 2 before dehumidification. However, if the air source of the air pump is external air, it will cause the filter 2 to be contaminated, achieving the opposite purification effect. Or it may be air from inside the cabinet 1, but the humidity inside the cabinet 1 is high, which will easily cause the components in the filter 2 to become wet, making it difficult to remove impurities and dust, and increasing the adhesion of impurities and dust. To address this, by setting a trigger mechanism, during the downward movement of the upright 20, the separation process between the upright 20 and the follower column 1101 occurs before the second protrusion 2002 contacts the guide cylinder 16. Therefore, before the piston 13 resets, the bellows 10 will complete its elastic elongation, that is, the top of the cover 11 and the cylinder 12 will return to a sealed docking state. When the piston 13 moves downwards to reset, some fresh air can be drawn into the cylinder 12 to achieve automatic gas storage and ensure that the gas source meets the requirements.

[0054] It should be emphasized that if the triggering mechanism is omitted and the piston 13 is fixedly connected to the upright rod 20, in order to ensure effective blowing of dust and foreign objects in the filter 2, the movement of the piston 13 inside the cylinder 12 needs to have sufficient speed. Correspondingly, the movement speed of the upright rod 20 is relatively large. This will result in a faster relative rotation speed between the first disc 4 and the second disc 5, thereby increasing the wear between the first disc 4 and the second disc 5, affecting the sealing performance between them, and causing subsequent external moisture to enter the cabinet. To address this, this application provides the triggering mechanism. During the upward movement of the upright rod 20, as the guide cylinder 16 and the telescopic rod 17 begin to swing upward until they are perpendicular to the track 6, the piston 13 slides slowly in the cylinder 12. Once the guide cylinder 16 and the telescopic rod 17 have passed... After reaching a position perpendicular to track 6, the piston 13 moves rapidly upward in the guide cylinder 16 due to the instantaneous rebound of spring 18, thus achieving the "slow first, fast later" characteristic of the blowing process. During the blowing process, since the size of cylinder 12 is constant, if high-speed airflow is used for blowing throughout, the piston 13 will have a short movement time in cylinder 12 before dehumidification. When fresh air enters, the dust dispersed above filter 2 has not yet completely dispersed, so a considerable amount of dust will be carried back to filter 2 by the fresh air. The slow-then-fast blowing approach adopted in this invention provides a longer diffusion time for dust with weak adhesion, allowing the dust to disperse fully above filter 2 as much as possible, weakening the impact of fresh airflow during dehumidification, and preventing a large amount of dust from re-entering filter 2, resulting in poor blowing effect.

[0055] Specifically, when purging filter 2, a clever "slow then fast" purging mode is employed, encompassing two key phases: slow and fast. In the initial slow phase, relatively loosely adhered dust within filter 2 is precisely blown up, allowing ample time for it to disperse. This design avoids the drawbacks of using high-speed airflow throughout the purging process, as consistently high-speed airflow can cause dust to spread widely after being blown out. When fresh air is introduced again, the dust still floating in the air can easily be re-brought into filter 2, causing secondary clogging. During the fast purging phase, stubborn dust with stronger adhesion is effectively removed.

[0056] In addition, under the action of slow airflow, dust particles can be gradually loosened. This process is like a pre-cleaning treatment for filter 2, creating more favorable conditions for the subsequent deep cleaning work of high-speed airflow, making the cleaning process smoother and more efficient. Of course, to achieve the ingenious "slow first, then fast" blowing method, a feasible solution is to add a movable electric push rod fixedly connected to piston disc 13 in the cabinet. The driving speed can be controlled by the electric push rod to achieve the ideal blowing effect of "slow first, then fast". However, this driving mode is highly dependent on a precise and rigorous logic control system; and the existing electric push rod 19 and the newly added electric push rod must establish a rigorous and orderly working sequence during operation; in this application, the upright rod 20 can move at a slow and stable speed to avoid wear on the first disc 4 and the second disc 5 due to excessive speed, which would affect the sealing performance and shorten the service life of the seal due to rapid action. On this basis, the slow and stable movement of the upright rod 20 can cause the piston 13 to move slowly and then fast in the cylinder 12, achieving the ideal blowing effect of "slow first and then fast".

[0057] As another embodiment of the present invention, a control method for the 20kV fully insulated intelligent ring main unit anti-condensation dehumidification device is also proposed, comprising the following steps:

[0058] Step 1: The humidity sensor monitors the air humidity inside cabinet 1;

[0059] Step 2: When the humidity exceeds the preset threshold, the electric push rod 19 is activated.

[0060] Step 3: Trigger the mechanism to blow the gas in cylinder 12 out of the cabinet 1 through filter 2;

[0061] Step 4: Open the exhaust port and filter 2, the dehumidification mechanism works, the humid air in cabinet 1 is drawn out of cabinet 1 through the exhaust port, and fresh air is introduced into cabinet 1 through filter 2.

[0062] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0063] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A 20kV fully insulated intelligent ring main unit anti-condensation dehumidification device, installed inside the unit, wherein the side and top of the unit are respectively provided with an exhaust port and an air inlet; characterized in that, A switching mechanism and a filter are respectively installed in the exhaust port and air inlet; an electric push rod is installed inside the cabinet, and a vertical rod is fixed to the movable end of the electric push rod. The electric push rod and the dehumidification mechanism connected to the switching mechanism communicate with a humidity sensor installed inside the cabinet; when the humidity inside the cabinet exceeds a preset threshold, the electric push rod operates, causing the switching mechanism to open the exhaust port and the filter to open, forming a gas flow path inside the cabinet. A cylinder is also fixed inside the cabinet. Before the filter opens, a triggering mechanism installed inside the cabinet can blow the gas in the cylinder through the filter to the outside of the cabinet; the switching mechanism includes a first plate fixed inside the exhaust port and... A second disc is rotatably connected to the first disc via a pivot pin. The first disc and the second disc are in a sealed sliding fit, and both have multiple openings equidistantly spaced along their circumference. The electric push rod can drive the second disc to rotate relative to the first disc through a sliding fit structure, so that the openings on the first disc and the second disc coincide or are offset. A rotating shaft is rotatably mounted on the inner wall of the cabinet. The triggering mechanism includes a piston that is sealed and slidably disposed in the cylinder and a follower arm fixed at the head end of the rotating shaft. A transmission arm is provided between the follower arm and the piston. The two ends of the transmission arm are respectively hinged to the piston and the follower arm. The follower arm is also connected to an elastic structure that cooperates with the upright.

2. The 20kV fully insulated intelligent ring main unit anti-condensation and dehumidification device according to claim 1, characterized in that, The sliding fit structure includes a fixed post fixed to the movable end of the electric push rod and a support arm fixed to the edge of the second disc. The support arm is provided with a strip-shaped through groove adapted to the fixed post. The fixed post passes through the strip-shaped through groove and is slidably connected to the support arm.

3. The 20kV fully insulated intelligent ring main unit anti-condensation and dehumidification device according to claim 1, characterized in that, The dehumidification mechanism includes a pipe fixedly installed inside the cabinet and an exhaust fan fixedly connected to the pipe. A cover is fixed to the end of the exhaust fan away from the pipe, and the cover is rotatably and sealed to the second plate.

4. The 20kV fully insulated intelligent ring main unit anti-condensation and dehumidification device according to claim 1, characterized in that, The cylinder is located below the filter, and a telescopic structure is provided between the two. The telescopic structure cooperates with the upright, and during the latter part of the stroke of the upright, it can cause the telescopic structure to perform a shortening action.

5. A 20kV fully insulated intelligent ring main unit anti-condensation and dehumidification device according to claim 4, characterized in that, The telescopic structure includes a bellows connected to the filter and a cover fixed to the end of the bellows away from the filter. The cover is fixedly connected to a follower column, and the upright can push the cover to separate from the cylinder through the follower column, thereby causing the bellows to contract.

6. The 20kV fully insulated intelligent ring main unit anti-condensation and dehumidification device according to claim 1, characterized in that, The elastic structure includes a guide cylinder fixed to the tail end of the rotating shaft and a telescopic rod slidably fitted with the guide cylinder. The guide cylinder is also provided with a spring, one end of which is connected to the inner wall of the guide cylinder. The other end of the spring is connected to the head end of the telescopic rod. The tail end of the telescopic rod is also provided with a pulley. An "L"-shaped track is fixed inside the cabinet, and the pulley abuts against the track.

7. A 20kV fully insulated intelligent ring main unit anti-condensation and dehumidification device according to claim 6, characterized in that, The upright is fixed with a second protruding post and a first protruding post distributed vertically, and the guide cylinder is located between the first protruding post and the second protruding post.

8. A control method for the anti-condensation and dehumidification device of a 20kV fully insulated intelligent ring main unit as described in claim 1, characterized in that, Includes the following steps: Step 1: The humidity sensor monitors the air humidity inside the cabinet; Step 2: When the humidity exceeds the preset threshold, the electric actuator will activate. Step 3: Trigger the mechanism to blow the gas in the cylinder through the filter to the outside of the cabinet; Step four: Open the exhaust vent and filter, the dehumidification mechanism will work, the humid air inside the cabinet will be drawn out of the cabinet through the exhaust vent, and fresh air will be introduced into the cabinet through the filter.

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