Air inlet protection device of low-voltage power distribution cabinet

Abstract

The invention discloses an air inlet protection device for a low-voltage power distribution cabinet, which belongs to the technical field of low-voltage power distribution cabinets and comprises a bottom cabinet, a cyclone separation device and a drying device are mounted in the bottom cabinet, an outlet end of the cyclone separation device is connected with an inlet end of the drying device, and an outlet end of the drying device is connected with a fan. The upper part is provided with a power distribution cabinet air outlet. Cold air enters the cyclone separation device for cyclone separation, impurities fall, the cold air enters the drying device for drying and enters the low-voltage power distribution cabinet to cool parts in the low-voltage power distribution cabinet, hot air is discharged through an air outlet of the power distribution cabinet, and effective filtering, drying treatment and good ventilation and heat dissipation circulation of the low-voltage power distribution cabinet are achieved. The electrical fault risk caused by moisture and impurities is greatly reduced, and the service life of electrical elements in the power distribution cabinet is effectively prolonged. The drying agent can be heated and dehumidified through reverse rotation of the fan, and frequent replacement is avoided.

Description

Technical Field

[0001] This invention belongs to the field of low-voltage distribution cabinet technology, specifically a low-voltage distribution cabinet air inlet protection device. Background Technology

[0002] In power systems, low-voltage switchgear is a key component for distributing electrical energy, controlling and protecting electrical equipment, and its stable operation is crucial. Low-voltage switchgear contains numerous electrical components, such as circuit breakers, contactors, relays, and fuses. These components generate heat during operation, and to ensure they operate within their normal temperature range, continuous ventilation and heat dissipation from outside air are necessary.

[0003] However, in real-world applications, the outside air is often not pure.

[0004] On the one hand, air inevitably contains various impurities and dust. For example, in industrial production environments, there may be metal shavings and dust particles; in outdoor environments, there may be leaves, insects, and sandstorms. When this air containing impurities and dust enters the low-voltage distribution cabinet directly, it will gradually adhere to the surface and interior of electrical components. This not only affects the heat dissipation of electrical components, causing their temperature to rise and accelerating their aging and damage, but may also lead to poor contact at electrical connection points, causing short circuits, open circuits, and other faults, seriously threatening the safe and stable operation of the entire power system.

[0005] On the other hand, humidity in the air is also a problem that cannot be ignored. In humid environments, such as coastal areas, rainy seasons, or indoor spaces with high humidity, the air humidity may reach high levels. When humid air enters low-voltage distribution cabinets, a water film can easily form on the surface of electrical components. This reduces the insulation performance of the components, increases the risk of leakage, and may even cause electrical short circuits. At the same time, a humid environment also accelerates the corrosion of metal parts, leading to a decrease in the mechanical strength of the equipment and a shortening of its service life.

[0006] Currently, while some protective measures exist for air intake in low-voltage distribution cabinets, most have limitations. Some products use only simple filters, which can only remove larger particles and are ineffective at intercepting fine dust. Furthermore, these filters are prone to clogging, requiring frequent replacement or cleaning, resulting in high maintenance costs. Additionally, some distribution cabinets only provide desiccant bags for dehumidification, but this method has low dehumidification efficiency and lacks real-time monitoring and automatic desiccant regeneration, failing to meet practical application needs. Summary of the Invention

[0007] To address the limitations of traditional air intake protection measures for low-voltage distribution cabinets, such as difficulty in effectively intercepting fine dust, easy clogging of filters, high maintenance costs, low dehumidification efficiency of simple desiccant bags, and short continuous use time, this invention provides an air intake protection device for low-voltage distribution cabinets.

[0008] This invention is achieved through the following technical solution: A low-voltage distribution cabinet air inlet protection device includes a base cabinet positioned at the bottom of the low-voltage distribution cabinet. A cyclone separator and a drying device are positioned and installed inside the base cabinet. The bottom of the cyclone separator is provided with an ash hopper. The outlet end of the cyclone separator is connected to the inlet end of the drying device through a pipe. The outlet end of the drying device is connected to a fan. The bottom of the low-voltage distribution cabinet has an air inlet that communicates with the outlet end of the fan. The top of the low-voltage distribution cabinet has an air outlet. The drying device contains a desiccant.

[0009] A further improvement of this invention is that an air inlet pipe is connected and installed at the inlet end of the cyclone separator, and an air inlet for the cabinet is opened on the upper part of one side wall of the cabinet, which is connected to the air inlet pipe. This effectively increases the height of the air inlet from the ground, avoids the intake of ground dust and water stains, and ensures the quality of the air intake.

[0010] A further improvement of this invention is that a first filter screen is installed inside the air inlet of the cabinet. This first filter screen provides preliminary filtration of the air entering the cabinet, effectively intercepting large particles such as leaves, insects, and larger dust particles. This ensures unobstructed airflow through the cyclone separator, guaranteeing its stable operation and reducing the processing burden on internal components. The first filter screen is installed inside the air inlet of the cabinet, making it relatively easy to access and allowing for regular cleaning and replacement. When the first filter screen accumulates a lot of debris, it can be easily removed for cleaning and replacement, or it can be conveniently and flexibly cleaned when the fan is reversed.

[0011] A further improvement of the present invention is that a filter device is installed at the inlet of the drying device. The filter device can further filter out the fine dust and impurities that remain after passing through the cyclone separator. By intercepting impurities in advance through the filter device, the desiccant can be effectively protected, ensuring that it maintains a good dehumidification effect for a long time, extending the service life of the desiccant, reducing the frequency of desiccant replacement, and reducing operating costs.

[0012] A further improvement of the present invention is that the drying device is equipped with an electric heating device capable of heating the desiccant. The presence of the electric heating device allows the moisture adsorbed in the desiccant to evaporate and be discharged through heating, thereby regenerating the desiccant. This process avoids frequent replacement of the desiccant, significantly reducing maintenance costs, while also improving the ease of use of the device. It eliminates the need for frequent shutdowns for desiccant replacement due to desiccant failure, ensuring the continuity of air intake drying treatment for low-voltage distribution cabinets.

[0013] A further improvement of this invention is that the desiccant is distributed at intervals along the air inlet direction, and the electric heating device is an electric heating plate positioned between adjacent desiccant bags. Placing the electric heating plate between adjacent desiccant bags allows for rapid and even heat transfer to both sides of the desiccant bags. Compared to centralized heating, this arrangement avoids desiccant performance damage caused by localized overheating or uneven heating, comprehensively improving desiccant regeneration efficiency and ensuring that each portion of the desiccant effectively restores its dehumidification capacity, thereby maintaining a stable and efficient dehumidification effect for the entire drying device. Furthermore, because the electric heating plate is close to the desiccant, the heating power and time can be precisely controlled according to the actual moisture absorption of the desiccant. When a certain area of ​​the desiccant absorbs a large amount of moisture, the power of the electric heating plate in that area can be increased specifically to achieve precise regeneration, avoiding unnecessary energy waste and improving energy utilization efficiency while ensuring dehumidification effect.

[0014] A further improvement of this invention is that the desiccant forms a continuous S-shaped channel within the drying device. When air enters the drying device, it flows along the S-shaped channel, which greatly increases the contact path between the air and the desiccant. Compared to a straight airflow channel, the S-shaped channel allows the air to remain in the device for a longer time, ensuring that the moisture in the air is fully adsorbed, thereby significantly improving dehumidification efficiency and providing a drier air intake environment for the low-voltage distribution cabinet. Furthermore, the tortuous S-shaped channel causes the air to change its flow direction multiple times, forming turbulence. The turbulent air has more sufficient contact with the desiccant, effectively preventing airflow short-circuiting and ensuring that every part of the desiccant can function effectively. This comprehensively enhances the drying device's ability to handle air with varying humidity levels, stably maintaining the intake air humidity within a suitable range and reducing the risk of electrical component failures due to moisture. Within the limited internal space of the drying device, the S-shaped channel design cleverly increases the airflow path without occupying excessive additional space. This allows the drying device to achieve efficient dehumidification in a compact structure, fitting the compact layout of the low-voltage distribution cabinet, facilitating overall installation and maintenance, and improving the spatial adaptability of the intake air protection device.

[0015] A further improvement of this invention is that the fan outlet is connected to the air inlet of the distribution cabinet via several connecting cylinders, with the connecting cylinders gradually expanding along the airflow direction. This allows for more space for airflow diffusion as it flows from the fan to the air inlet of the distribution cabinet, preventing sudden contraction or blockage of the airflow and effectively reducing airflow resistance. This helps improve airflow efficiency, ensuring that the fan delivers sufficient air to the low-voltage distribution cabinet with minimal energy consumption, maintaining good ventilation and heat dissipation. Furthermore, it allows for more even distribution of airflow within the low-voltage distribution cabinet, preventing airflow concentration in a particular area and ensuring that all electrical components within the cabinet are adequately cooled. This prevents localized overheating from affecting the normal operation of the equipment and improves the stability of the low-voltage distribution cabinet's operation.

[0016] A further improvement of this invention is that the air inlet pipe is connected to the outlet end of the cyclone separator via a pipeline, and a three-way control valve is installed at this connection point. When the fan is rotating in the forward direction to provide cold air to the low-voltage distribution cabinet, the three-way control valve is controlled to disconnect the air inlet pipe from the outlet end of the cyclone separator, connecting the outlet end of the cyclone separator to the inlet end of the drying device, thus achieving normal air intake filtration and drying operations. When the fan is rotating in the reverse direction (during backflushing to heat the desiccant in the drying device), the three-way control valve is controlled to connect the air inlet pipe to the inlet end of the drying device, disconnecting the outlet end of the cyclone separator from the inlet end of the drying device, preventing the backflushing airflow from passing through the cyclone separator, allowing the backflushing airflow to be discharged directly through the air inlet pipe, increasing the backflushing airflow velocity, improving the moisture removal effect, and improving the backflushing cleaning effect on the first filter screen.

[0017] A further improvement of this invention is that the air outlet of the distribution cabinet has a louvered structure, and its upper part is covered with an outlet cover. The outlet cover protects the air outlet of the distribution cabinet, effectively preventing rainwater, dust, leaves and other debris from entering the distribution cabinet, reducing the risk of failure, extending the service life of the equipment, and ensuring the stable operation of electrical components.

[0018] As can be seen from the above technical solutions, the beneficial effects of the present invention are: In operation, a fan draws in cool air from the outside in. This external cool air enters the cyclone separator through the inlet duct for cyclone separation. Impurities fall along the inner wall of the cyclone separator and are collected in the ash hopper at the bottom. The cool air, now free of impurities, enters the drying unit and is dried by a desiccant. The dried cool air then enters the low-voltage distribution cabinet through the bottom air inlet, cooling the internal components. Hot air is exhausted through the top air outlet of the low-voltage distribution cabinet. This achieves effective filtration, drying, and good ventilation and heat dissipation circulation for the low-voltage distribution cabinet. This low-voltage distribution cabinet air inlet protection device ensures that the air entering the cabinet is clean and dry, greatly reducing the risk of electrical faults caused by moisture and impurities, and effectively extending the service life of the electrical components inside the cabinet. Compared to traditional filtration devices, the cyclone separator provides better separation than traditional filters and avoids clogging. Only periodic emptying of the ash hopper is required, making operation convenient and maintenance costs low. After a period of use, the fan can be reversed to draw in hot air from inside the low-voltage distribution cabinet to heat and dehumidify the desiccant in the drying device. The moisture can then be discharged through the air inlet pipe, effectively ensuring the drying effect of the desiccant and avoiding frequent replacement of the desiccant. The overall structure is compact and fully functional, improving the reliability and stability of the low-voltage distribution cabinet from multiple dimensions. Attached Figure Description

[0019] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a structural schematic diagram of a specific embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the air inlet arrangement of the power distribution cabinet according to a specific embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the base cabinet structure according to a specific embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of the air outlet arrangement structure of the power distribution cabinet according to a specific embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram illustrating the connection principle of the internal components of the cabinet in a specific embodiment of the present invention.

[0025] In the attached diagram: 1. Low-voltage distribution cabinet; 11. Air inlet of distribution cabinet; 12. Air outlet of distribution cabinet; 13. Outlet cover; 2. Base cabinet; 21. Base cabinet door; 22. Handle; 23. Air inlet of base cabinet; 24. Support plate; 3. Cyclone separator; 31. Mounting frame; 32. Ash hopper; 33. Ash discharge pipe; 4. Drying device; 41. Desiccant; 42. Electric heating plate; 5. Fan; 6. Connecting cylinder; 61. Mounting flange; 7. Three-way control valve; 8. Air inlet pipe; 9. Filter device. Detailed Implementation

[0026] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0027] like Figure 1-5As shown, this invention discloses an air inlet protection device for a low-voltage distribution cabinet, including a base cabinet 2 positioned at the bottom of a low-voltage distribution cabinet 1. A vertical cyclone separator 3 and a drying device 4 are positioned and installed inside the base cabinet 2. The bottom of the cyclone separator 3 is provided with an ash hopper 32. The upper outlet end of the cyclone separator 3 is connected to the inlet end of the drying device 4 through a pipe. The outlet end of the drying device 4 is connected to a fan 5. The bottom of the low-voltage distribution cabinet 1 has a distribution cabinet air inlet 11 that communicates with the outlet end of the fan 5. The upper part of the low-voltage distribution cabinet 1 has a distribution cabinet air outlet 12. The drying device 4 is provided with a desiccant 41.

[0028] In operation, fan 5 draws in cold air from the outside in. The external cold air enters the cyclone separator 3 through the air inlet pipe 8 for cyclone separation. Impurities (dust particles, debris, etc.) fall along the inner wall of the cyclone separator 3 and are collected in the ash hopper 32 at the bottom. The cold air after impurity separation enters the drying device 4 and is dried by desiccant 41. The dried cold air enters the low-voltage distribution cabinet 1 through the bottom distribution cabinet air inlet 11, cooling the internal components of the low-voltage distribution cabinet 1. Hot air is discharged through the upper distribution cabinet air outlet 12, achieving effective filtration, drying, and good ventilation and heat dissipation circulation for the low-voltage distribution cabinet 1. This low-voltage distribution cabinet air inlet protection device ensures that the air entering the low-voltage distribution cabinet 1 is clean and dry, greatly reducing the risk of electrical faults caused by moisture and impurities, and effectively extending the service life of the electrical components inside the distribution cabinet. The cyclone separator 3 separates impurities (dust particles, debris, etc.), achieving better separation than traditional filtration devices and preventing clogging. Only periodic discharge of accumulated impurities from the ash hopper 32 is required (via the ash discharge pipe 33 at the bottom of the ash hopper 32), making operation convenient and maintenance costs low. After a period of use, the fan 5 can be reversed to draw hot air from inside the low-voltage distribution cabinet 1 to heat and dehumidify the desiccant 41 in the drying device 4. Moisture is discharged through the air inlet pipe 8, effectively ensuring the drying effect of the desiccant 41 and avoiding frequent replacements. The overall structure is compact and fully functional, improving the reliability and stability of the low-voltage distribution cabinet operation from multiple dimensions.

[0029] Among them, the fan 5 is located at the outlet end of the drying device 4, which effectively avoids the influence of dust and moisture on the fan 5 and can effectively extend its service life.

[0030] Furthermore, the fan 5 adopts frequency conversion control, and a temperature sensor is installed at the air outlet 12 of the distribution cabinet. The temperature sensor detects the air outlet temperature and automatically controls the speed of the fan 5, thereby realizing automatic control and adjustment of the internal temperature of the low-voltage distribution cabinet 1.

[0031] like Figure 1 , 3As shown, the base cabinet 2 has a rectangular structure adapted to the low-voltage distribution cabinet 1, including a main frame and side panels covering the frame. The base cabinet 2 can be fixedly connected to the bottom of the low-voltage distribution cabinet 1 by bolts. By raising the low-voltage distribution cabinet 1 with the base cabinet 2, the influence of debris (water stains, materials, etc.) on the foundation surface on the low-voltage distribution cabinet 1 is avoided, ensuring the reliability and safety of the operation of the low-voltage distribution cabinet 1.

[0032] A horizontal support plate 24 is installed inside the base cabinet 2. The support plate 24 has a certain height above the ground to prevent water stains from the foundation surface from entering the base cabinet 2. The cyclone separator 3 is vertically positioned and installed on the support plate 24 via the mounting bracket 31. The drying device 4 is also positioned and installed on the support plate 24, achieving reliable positioning and installation of the cyclone separator 3 and the drying device 4. The ash discharge pipe 33 extends downward through the support plate 24. The ash discharge pipe 33 is equipped with an ash discharge valve, and an ash hopper can be installed at the bottom of the ash discharge pipe 33 for easy ash discharge and cleaning.

[0033] Furthermore, cabinet doors 21 are installed on opposite sides of the cabinet 2. Each cabinet door 21 is equipped with a handle 22 and a locking mechanism. By opening the cabinet door 21, it is convenient to inspect, maintain, and replace the internal components, thus achieving ease of operation.

[0034] Among them, such as Figure 4 As shown, the air outlet 12 of the distribution cabinet is located at the top of the rear side wall of the low-voltage distribution cabinet 1 and has a louvered structure. An outlet cover 13 is installed on its upper part. The outlet cover 13 protects the air outlet 12, effectively preventing rainwater, dust, leaves, and other debris from entering the distribution cabinet, reducing the risk of failure and extending the service life of the equipment. The louvered air outlet 12 allows for adjustment of the ventilation volume by adjusting the blade angle to adapt to different ambient temperatures and equipment operating conditions, achieving better heat dissipation and ensuring that the temperature inside the distribution cabinet remains within a reasonable range, thus ensuring the stable operation of electrical components.

[0035] like Figure 5 As shown, the drying device 4 has a rectangular box structure, which contains an electric heating device capable of heating the desiccant 41. After the desiccant 41 continuously absorbs moisture, its dehumidification capacity gradually decreases. The electric heating device allows the moisture absorbed in the desiccant 41 to evaporate and be discharged through heating (which can be combined with the reverse blowing of the fan 5), thus regenerating the desiccant 41. This process avoids frequent replacement of the desiccant 41, significantly reducing maintenance costs and improving the ease of use of the device. It eliminates the need for frequent shutdowns for replacement due to desiccant 41 failure, ensuring the continuity of air drying treatment for the low-voltage distribution cabinet.

[0036] Furthermore, desiccant 41 is placed inside desiccant bags, which are spaced apart along the air inlet direction (horizontal air inlet). The electric heating device is an electric heating plate 42, which is vertically positioned between adjacent desiccant bags (positioned with the drying device 4). The placement of the electric heating plate 42 between adjacent desiccant bags allows for rapid and even heat transfer to both sides of the bags. Compared to centralized heating, this arrangement avoids damage to the performance of desiccant 41 caused by localized overheating or uneven heating, comprehensively improving the regeneration efficiency of desiccant 41 and ensuring that each portion of desiccant 41 can effectively restore its dehumidification capacity, thereby maintaining a stable and efficient dehumidification effect for the entire drying device 4. Moreover, because the electric heating plate is close to the desiccant 41, the heating power and time can be precisely controlled according to the actual moisture absorption of the desiccant 41. When the moisture absorption of desiccant 41 in a certain area is large, the power of the electric heating plate 42 in that area can be increased specifically to achieve precise regeneration, avoiding unnecessary energy waste and improving energy utilization efficiency while ensuring dehumidification effect.

[0037] Among them, the electric heating plate 42 adopts a hollow structure (with multiple through holes), which effectively avoids affecting the air intake speed and ensures reliable cooling of the low-voltage distribution cabinet 1.

[0038] Furthermore, the desiccant 41 forms a continuous S-shaped channel within the drying device 4. When air enters the drying device 4, it flows along the S-shaped channel, which greatly increases the contact path between the air and the desiccant 41. Compared to a straight airflow channel, the S-shaped channel allows the air to stay in the device for a longer time, ensuring that the moisture in the air is fully adsorbed, thereby significantly improving the dehumidification efficiency and providing a drier air intake environment for the low-voltage distribution cabinet 1. Moreover, the tortuous S-shaped channel causes the air to change its flow direction multiple times, forming turbulence. The air in the turbulent state has more sufficient contact with the desiccant 41, which can effectively avoid airflow short circuits, allowing each desiccant 41 to play its role. This comprehensively improves the drying device 4's ability to handle air with different humidity levels, stably maintains the intake air humidity within a suitable range, and reduces the risk of electrical components malfunctioning due to moisture. Within the limited internal space of the drying unit 4, the S-shaped channel design cleverly increases the airflow path without taking up too much extra space. This allows the drying unit 4 to achieve efficient dehumidification in a compact structure, which is in line with the compact layout of the low-voltage distribution cabinet, making it easy to install and maintain as a whole, and improving the spatial adaptability of the air intake protection device.

[0039] Among them, such as Figure 3 , 5 As shown, the inlet end of the cyclone separator 3 is connected to an air inlet pipe 8, and an air inlet 23 connected to the air inlet pipe 8 is opened on the upper part of one side wall of the base cabinet 2. The air inlet 23 is located at the upper part of the side wall of the base cabinet 2, which effectively increases the height of the air inlet from the ground, avoids the intake of dust and water stains from the ground, and ensures the quality of air intake.

[0040] Furthermore, a first filter screen is installed inside the air inlet 23 of the base cabinet. This first filter screen performs preliminary filtration of the air entering the base cabinet air inlet 23, effectively intercepting large particles such as leaves, insects, and larger dust particles. This ensures unobstructed airflow through the cyclone separator 3, guaranteeing its stable operation. Pre-filtering out large particles reduces the total amount of impurities entering the cyclone separator 3 and the drying device 4, thus reducing their processing burden. For the cyclone separator 3, it can focus more on separating small dust particles. For the drying device 4, it reduces contamination of the desiccant 41 by impurities, extending the desiccant's lifespan and reducing maintenance costs. The first filter screen is installed inside the base cabinet air inlet 23, a relatively easily accessible location for regular cleaning and replacement. When the first filter screen accumulates a lot of debris, it can be easily removed for cleaning and replacement, or conveniently and flexibly cleaned (by brushing away debris) when the fan 5 reverses.

[0041] like Figure 5 As shown, a filter device 9 is installed at the inlet of the drying device 4. The filter device 9 further filters out fine dust and impurities remaining after passing through the cyclone separator. By intercepting impurities in advance, the filter device 4 effectively protects the desiccant 41, ensuring its long-term good dehumidification effect, extending its service life, reducing the frequency of desiccant 41 replacement, and lowering operating costs. The filter device 4 prevents dust and impurities from entering the subsequent fan 5, avoiding wear and damage to key components such as the blades and bearings of the fan 5, reducing the failure rate of the fan 5 caused by impurities, extending its service life, and ensuring stable and reliable ventilation of the air inlet protection device. The filter device 9 works in conjunction with the cyclone separator 3 and the first filter screen inside the base cabinet air inlet 23 to achieve a better filtration effect.

[0042] Among them, such as Figure 5 As shown, the outlet end of the fan 5 is connected to the air inlet 11 of the distribution cabinet via several connecting cylinders 6, and the connecting cylinders 6 are gradually expanding along the air inlet direction. This gradual expansion of the connecting cylinders 6 along the air inlet direction allows for more space for airflow diffusion as it flows from the fan 5 to the air inlet 11 of the distribution cabinet, preventing sudden contraction or blockage of the airflow and effectively reducing airflow resistance. This helps improve airflow efficiency, ensuring that the fan 5 delivers sufficient air to the low-voltage distribution cabinet 1 with minimal energy consumption, maintaining good ventilation and heat dissipation. Furthermore, the gradually expanding connecting cylinders 6 allow for more even distribution of airflow within the low-voltage distribution cabinet 1, preventing airflow concentration in a specific area and ensuring that all electrical components within the low-voltage distribution cabinet 1 are adequately cooled. This prevents localized overheating from affecting the normal operation of the equipment and improves the operational stability of the low-voltage distribution cabinet 1.

[0043] Furthermore, the connecting cylinder 6 is connected and sealed to the air inlet 11 of the low-voltage distribution cabinet 1 at the bottom of the low-voltage distribution cabinet 1 via the mounting flange 61 (a sealing ring may be provided). The design of multiple connecting cylinders 6 increases the connection points with the low-voltage distribution cabinet 1, making the connection more stable. This helps to reduce the loosening of the connection caused by the vibration of the fan 5 or other external forces, ensuring the reliability of the air inlet protection device during long-term operation and reducing the risk of failure caused by connection problems.

[0044] Among them, such as Figure 5 As shown, the air inlet pipe 8 is connected to the outlet end of the cyclone separator 3 via a pipe, and a three-way control valve 7 is installed at this connection point. When the fan 5 rotates in the forward direction to provide cold air to the low-voltage distribution cabinet 1, the three-way control valve 7 is controlled to disconnect the air inlet pipe 8 from the outlet end of the cyclone separator 3, connecting the outlet end of the cyclone separator 3 to the inlet end of the drying device 4, thus achieving normal air intake filtration and drying operations. When the fan 5 rotates in the reverse direction (when heating and backflushing the desiccant 41 in the drying device 4), the three-way control valve 7 is controlled to connect the air inlet pipe 8 to the inlet end of the drying device 4, disconnecting the outlet end of the cyclone separator 3 from the inlet end of the drying device 4, preventing the backflushing airflow from passing through the cyclone separator 3, and allowing the backflushing airflow to be discharged directly through the air inlet pipe 8, increasing the backflushing airflow speed, improving the moisture removal effect, and improving the backflushing cleaning effect on the first filter screen.

[0045] This low-voltage distribution cabinet air intake protection device works by drawing in cool air from the outside via fan 5. The external cool air enters the cyclone separator 3 through the air inlet pipe 8 for cyclone separation. Impurities (dust particles, debris, etc.) fall along the inner wall of the cyclone separator 3 and are collected in the ash hopper 32 at the bottom. The cool air after impurity separation enters the drying device 4 and is dried by desiccant 41. The dried cool air enters the low-voltage distribution cabinet 1 through the bottom air inlet 11, cooling the internal components. Hot air is discharged through the top air outlet 12 of the low-voltage distribution cabinet 1. This achieves effective filtration, drying, and good ventilation and heat dissipation circulation for the low-voltage distribution cabinet 1. This low-voltage distribution cabinet air intake protection device ensures that the air entering the low-voltage distribution cabinet 1 is clean and dry, greatly reducing the risk of electrical faults caused by moisture and impurities, and effectively extending the service life of the electrical components inside the distribution cabinet. The cyclone separator 3 separates impurities (dust particles, debris, etc.), achieving better separation than traditional filtration devices and preventing clogging. Only periodic discharge of accumulated impurities from the ash hopper 32 is required (via the ash discharge pipe 33 at the bottom of the ash hopper 32), making operation convenient and maintenance costs low. After a period of use, the fan 5 can be reversed to draw hot air from inside the low-voltage distribution cabinet 1 to heat and dehumidify the desiccant 41 in the drying device 4. Moisture is discharged through the air inlet pipe 8, effectively ensuring the drying effect of the desiccant 41 and avoiding frequent replacements. The overall structure is compact and fully functional, improving the reliability and stability of the low-voltage distribution cabinet operation from multiple dimensions.

[0046] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A low-voltage distribution cabinet air inlet protection device, comprising a base cabinet (2) positioned and installed at the bottom of the low-voltage distribution cabinet (1), characterized in that, The bottom cabinet (2) is equipped with a cyclone separator (3) and a drying device (4). The bottom of the cyclone separator (3) is equipped with an ash hopper (32). The outlet of the cyclone separator (3) is connected to the inlet of the drying device (4) through a pipe. The outlet of the drying device (4) is connected to a fan (5). The bottom of the low-voltage distribution cabinet (1) is provided with a distribution cabinet air inlet (11) that is connected to the outlet of the fan (5). The top of the low-voltage distribution cabinet (1) is provided with a distribution cabinet air outlet (12). The drying device (4) is equipped with a desiccant (41).

2. The low-voltage distribution cabinet air inlet protection device according to claim 1, characterized in that, The cyclone separator (3) is connected to an air inlet pipe (8) at its inlet end, and the upper part of one side wall of the cabinet (2) is provided with a cabinet air inlet (23) connected to the air inlet pipe (8).

3. The low-voltage distribution cabinet air inlet protection device according to claim 2, characterized in that, The first filter screen is installed inside the air inlet (23) of the base cabinet.

4. The low-voltage distribution cabinet air inlet protection device according to claim 1, characterized in that, The inlet of the drying device (4) is equipped with a filter device (9).

5. The low-voltage distribution cabinet air inlet protection device according to claim 1, characterized in that, The drying device (4) is equipped with an electric heating device that can heat the desiccant (41).

6. The low-voltage distribution cabinet air inlet protection device according to claim 5, characterized in that, The desiccant (41) is distributed at intervals along the air inlet direction, and the electric heating device is an electric heating plate (42), which is placed between adjacent desiccants (41).

7. The low-voltage distribution cabinet air inlet protection device according to claim 6, characterized in that, The desiccant (41) forms a continuous S-shaped channel within the drying device (4).

8. The low-voltage distribution cabinet air inlet protection device according to claim 1, characterized in that, The outlet end of the fan (5) is connected to the air inlet (11) of the power distribution cabinet through several connecting tubes (6), and the connecting tubes (6) gradually expand along the air inlet direction.

9. The low-voltage distribution cabinet air inlet protection device according to claim 2, characterized in that, The air inlet pipe (8) is connected to the outlet end of the cyclone separator (3) through a pipe, and a three-way control valve (7) is installed at the connection position.

10. The low-voltage distribution cabinet air inlet protection device according to claim 1, characterized in that, The air outlet (12) of the power distribution cabinet has a louver structure, and its upper part is covered with an outlet cover (13).

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