Switch cabinet with forced ventilation and dehumidification functions

Abstract

This invention discloses a switch cabinet with forced ventilation and dehumidification functions, relating to the field of electrical equipment technology. It includes a cabinet body, a cooling fan, an exhaust pipe, and exhaust holes. The exhaust pipe is connected to the air inlet of the cooling fan. A sliding part is fitted onto the exhaust pipe, and a water-absorbing component for absorbing condensate from the surface of the exhaust pipe is installed inside the sliding part. A water-receiving tray is provided on the sliding path of the exhaust pipe along the sliding part. The sliding part is configured to cooperate with the water-receiving tray to squeeze the water-absorbing component when sliding downwards, and to guide the squeezed-out condensate into the exhaust holes. In this invention, by setting an exhaust pipe extending to the lower part inside the switch cabinet and opening multiple exhaust holes on the exhaust pipe, multi-point air extraction can be performed at various locations inside the switch cabinet. This solves the problem of fixed airflow direction and easy formation of ventilation blind spots in traditional fixed cooling fans, achieving effective cooling of the heat source inside the switch cabinet, avoiding local overheating, eliminating ventilation blind spots, and improving heat dissipation uniformity.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment technology, specifically to a switch cabinet with forced ventilation and dehumidification functions. Background Technology

[0002] A switchgear is an electrical device used in power systems for power generation, transmission, distribution, and energy conversion. Its main function is to open, close, control, and protect electrical equipment. Switchgear typically contains major electrical components such as circuit breakers, disconnect switches, and instrument transformers.

[0003] During the operation of the switchgear, the aforementioned electrical components inevitably generate heat. Excessive heat accumulation can lead to overheating inside the cabinet, affecting the performance and lifespan of the components and even posing safety hazards. Furthermore, the temperature difference between the inside and outside of the cabinet can cause condensation on the inner walls. To address the heat dissipation problem, current technology typically involves installing cooling fans on the switchgear for forced ventilation and cooling.

[0004] However, existing cooling fans are usually fixed in specific locations within the switch cabinet (such as cabinet doors or side panels), and their airflow direction and ventilation range are relatively fixed. Due to the complex internal structure and uneven component layout of the switch cabinet, this fixed cooling method easily creates ventilation blind spots inside the cabinet, resulting in poor heat dissipation in local areas and difficulty in effectively cooling heat sources in all corners of the interior. Summary of the Invention

[0005] The purpose of this invention is to provide a switch cabinet with forced ventilation and dehumidification functions to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a switch cabinet with forced ventilation and dehumidification functions, comprising a cabinet body and a cooling fan, wherein the cooling fan is installed on the cabinet body, and the cabinet body is also provided with an exhaust pipe, wherein the exhaust pipe has an exhaust hole, and the exhaust pipe is connected to the air inlet end of the cooling fan. The extraction pipe is fitted with a sliding part that can slide along its axial direction, and a water-absorbing component for absorbing condensate on the surface of the extraction pipe is installed inside the sliding part. A water receiving tray is provided on the air extraction pipe along the sliding path of the sliding part; The sliding part is configured to cooperate with the water receiving tray to squeeze the water-absorbing member when sliding downwards, and to guide the squeezed-out condensate into the air extraction hole.

[0007] Furthermore, a squeezing push plate is slidably installed inside the sliding part, and the water-absorbing component is an annular sponge installed between the squeezing push plate and the inner top wall of the sliding part; The extrusion push plate is provided with a water outlet groove through which water flows; When the sliding part slides downward, the water receiving tray passes through the bottom opening of the sliding part and abuts against the squeezing push plate, driving the squeezing push plate to move upward to squeeze the sponge.

[0008] Furthermore, a scraper is fixed to the lower surface of the extrusion push plate, and the extrusion push plate is provided with a rotating mechanism. The rotating mechanism is used to drive the extrusion push plate to rotate, and the scraper rotates with the extrusion push plate to drive the condensate in the water receiving tray to the air extraction hole.

[0009] Furthermore, the rotating mechanism includes a rolling part rotatably connected to the periphery of the extrusion push plate, and the inner wall of the sliding part is provided with a spiral rolling groove, the rolling part being engaged in the spiral rolling groove; When the extrusion pusher plate moves upward under the pushing force of the water receiving tray, the rolling part rolls along the spiral rolling groove, driving the extrusion pusher plate to rotate.

[0010] Furthermore, the cabinet is also provided with a drive mechanism for driving the sliding part to move up and down. The drive mechanism includes a mounting part installed on the exhaust pipe, a first ball screw rotatably connected to the mounting part, and a first screw nut that cooperates with the first ball screw. The first lead screw nut is fixedly connected to the sliding part via a connecting arm.

[0011] Furthermore, a rotating part is rotatably connected to the top of the sliding part, a winding roller is connected to the rotating part, a film is wound on the winding roller, and the free end of the film is connected to the air extraction pipe. The drive mechanism also includes a linkage component for driving the rotating part to rotate.

[0012] Furthermore, the linkage component includes a fixedly mounted second ball screw and a second screw nut rotatably connected to the connecting arm. The second screw nut is fitted onto the second ball screw and is connected to the rotating part in a transmission connection. When the sliding part moves up and down, the second lead screw nut moves and rotates along the second ball screw, driving the rotating part to rotate to take in and release the film.

[0013] Furthermore, a connecting sleeve is coaxially fixed to the second lead screw nut, a small gear is fixedly fitted on the connecting sleeve, and a gear part that meshes with the small gear is provided around the periphery of the rotating part.

[0014] Furthermore, an air extraction chamber is installed on the air inlet side of the cooling fan, and the air extraction chamber is connected to the upper end of the air extraction pipe through a bend. The lower end of the suction pipe is closed, and multiple suction holes are provided and distributed along the axial direction of the suction pipe. The water receiving tray is located below the suction holes.

[0015] Furthermore, a stop ring is fixedly installed at the lower end of the sliding part, and the stop ring is used to limit the downward movement of the extrusion push plate; The outer diameter of the water receiving tray is matched with the inner diameter of the stop ring.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, by setting an exhaust pipe extending to the lower part inside the switch cabinet and opening multiple exhaust holes on the exhaust pipe, it is possible to exhaust air at multiple points in various positions inside the switch cabinet. This solves the problem that the air supply direction of traditional fixed cooling fans is fixed and easily forms ventilation blind spots, and achieves effective cooling of the heat source inside the switch cabinet, avoids local overheating, eliminates ventilation blind spots, and improves heat dissipation uniformity. 2. In this invention, the sliding part, the water-absorbing part (sponge), and the water-receiving tray are used to achieve automated cleaning of condensate on the surface of the air extraction pipe. During the movement of the sliding part, the sponge absorbs the condensate on the pipe wall. Then, with the help of the water-receiving tray, the sponge is squeezed to force the water out and guide it into the air extraction hole. The negative pressure airflow generated by the cooling fan is used to discharge the condensate outside the cabinet, which effectively prevents the insulation performance from deterioration and equipment corrosion caused by the accumulation or adhesion of condensate inside the cabinet. 3. In this invention, by setting a spiral rolling groove, a rolling part and a scraper, a rotational motion is generated when the extrusion pusher moves up and down. The rotation of the scraper can actively drive the condensate in the water receiving tray to the air extraction hole, which accelerates the discharge of condensate, improves drainage efficiency and reliability, and prevents water residue. 4. In this invention, the winding roller is driven to rotate by a linkage component (second ball screw, pinion, etc.). During the downward movement of the sliding part, the film is released and wound onto the suction pipe to form a protective film. This effectively isolates external water vapor and hot air from direct contact with the suction pipe wall. During the process of absorbing condensate from the sponge, the generation of condensate on the part of the suction pipe located above the sliding part is reduced, playing an active role in preventing condensation. When the sliding part moves upward and resets, the film is automatically recycled, ensuring the reusability of the device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a switch cabinet with forced ventilation and dehumidification functions according to the present invention; Figure 2 for Figure 1 A schematic diagram showing the positional relationship of the structure from another perspective; Figure 3 This is a schematic diagram showing the positional relationship of the air extraction chamber, the bent pipe, and the cooling fan after assembly in this invention. Figure 4 for Figure 3A schematic diagram showing the positional relationship of the structure from another perspective; Figure 5 for Figure 3 A magnified schematic diagram of the positional relationship of a local structure at point A in the middle; Figure 6 This is a schematic diagram showing the positional relationship of the sliding part, connecting arm, and winding roller after assembly in this invention. Figure 7 for Figure 6 Schematic diagram of the positional relationships of the central structure after explosive decomposition; Figure 8 for Figure 6 A schematic diagram showing the positional relationship of the middle section after it has been cut open; Figure 9 for Figure 6 A schematic diagram showing the positional relationship of a partially dissected structure from another perspective; Figure 10 This is a schematic diagram showing the positional relationship between the sliding part and the connecting arm after assembly in this invention.

[0018] The following are the annotations for each item in the diagram: 1. Cooling fan; 2. Copper pipe; 3. Sliding part; 4. Water tray; 5. Cabinet; 6. Air extraction pipe; 7. Bend; 8. Air extraction chamber; 9. Small motor; 10. Mounting part; 11. First ball screw; 12. Coupling; 13. Second ball screw; 14. Winding roller; 15. Air extraction hole; 16. Connecting arm; 17. Rotating part; 18. Pinion; 19. First screw nut; 20. Connecting sleeve; 21. Second screw nut; 22. Water outlet groove; 23. Stop ring; 24. Rolling part; 25. Extrusion push plate; 26. Spiral rolling groove; 27. Scraper. Detailed Implementation

[0019] 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.

[0020] Please see Figures 1-10This invention provides a technical solution: a switch cabinet with forced ventilation and dehumidification functions, including a cooling fan 1 installed on the side panel of the cabinet 5 and located inside the cabinet 5. A copper pipe 2 is installed on the cooling fan 1. A temperature and humidity sensor (not shown in the figure) is installed inside the cabinet 5 to detect the temperature and humidity inside the cabinet 5. An air extraction chamber 8 is installed on the air inlet side of the cooling fan 1. The air inlet end of the air extraction chamber 8 is connected to an extraction pipe 6 through a bend 7. The extraction pipe 6 can be a galvanized steel pipe. The lower end of the extraction pipe 6 extends to the lower side of the inner cavity of the cabinet 5, and the lower end of the extraction pipe 6 is closed, with its periphery opening from top to bottom. Multiple air extraction holes 15 are provided, with the openings of the air extraction holes 15 facing the inner center of the cabinet 5. When the temperature and humidity inside the cabinet 5 reach the predetermined range, the signals collected by the temperature and humidity sensors are fed back to the external controller. The external controller controls the cooling fan 1 to start. When the cooling fan 1 starts, it extracts air from the inside of the cabinet 5 through the air extraction holes 15, thereby expelling the hot air inside the cabinet 5 to the outside of the cabinet 5 through the air extraction holes 15, the air extraction pipe 6, the bend pipe 7, and the air extraction chamber 8, thus achieving ventilation and heat dissipation inside the cabinet 5. Because the hot air inside the cabinet 5 can be expelled in time, the condensation phenomenon on the inner wall of the cabinet 5 after the hot air liquefies is reduced. Combination Figures 3 to 10 As shown, and please refer to the following: Figures 5 to 10 A water receiving tray 4 is fixedly fitted around the periphery of the suction pipe 6. Multiple water receiving trays 4 are provided, each corresponding to a different suction port 15. The top of the water receiving tray 4 is concave, and it is located below the suction port 15. A sliding part 3 is also fitted around the periphery of the suction pipe 6. The sliding part 3 can slide freely around the periphery of the suction pipe 6. The bottom of the sliding part 3 is open, and a pressing push plate 25 is coaxially engaged within the inner cavity of the sliding part 3. The pressing push plate 25 can slide freely along the axial direction of the suction pipe 6 within the inner cavity of the sliding part 3. The upper surface of the extrusion push plate 25 and the top wall of the inner cavity of the sliding part 3 form an installation cavity. An annular sponge (not shown in the figure) is installed in the installation cavity. The sponge has a ring-shaped outline and the central hole of the sponge is in sliding fit with the air extraction pipe 6. When the sliding part 3 slides on the periphery of the air extraction pipe 6, the sponge can absorb the condensate formed on the surface of the air extraction pipe 6. The central hole diameter of the extrusion push plate 25 is larger than the outer diameter of the air extraction pipe 6, and the surface of the extrusion push plate 25 is provided with multiple through holes in the form of water outlet grooves 22 along the circumferential direction. Combination Figures 5 to 10 As shown, and please refer to the following: Figure 8A stop ring 23 is fixedly fitted onto the lower opening of the sliding part 3. This stop ring 23 limits the downward sliding of the extrusion push plate 25 within the inner cavity of the sliding part 3, preventing it from detaching. The outer diameter of the water collection tray 4 matches the size of the annular hole in the stop ring 23, allowing the water collection tray 4 to pass through the annular hole in the stop ring 23 and enter the inner cavity of the sliding part 3 when the sliding part 3 slides downwards around the periphery of the suction pipe 6. As the sliding part 3 moves downwards, the water collection tray 4 exerts an upward extrusion force on the extrusion push plate 25, thereby squeezing the sponge and expelling the condensate absorbed within the sponge. Figure 9 As shown, there is a gap between the lower surface of the extrusion plate 25 and the inner bottom wall of the water receiving tray 4. This gap forms a water storage space. That is, when the extrusion plate 25 extrudes the sponge that has absorbed condensate, the condensate in the sponge will flow in the direction of less resistance. That is, the condensate will flow into the water storage space through the outlet trough 22 and the middle hole of the extrusion plate 25, and can flow into the air extraction hole 15. Since the cooling fan 1 continuously extracts air, the condensate will be discharged from the cooling fan 1 under the negative pressure generated by the air extraction, thus preventing the condensate from adhering to the surface of the air extraction pipe 6. Combination Figures 5 to 10 As shown, and please refer to the following: Figure 8 and Figure 9 Multiple scraper blades 27 are fixedly attached to the lower surface of the extrusion push plate 25. The lower surface of the scraper blades 27 is adapted to the shape of the inner wall of the water receiving tray 4. In addition, two rolling parts 24 are rotatably embedded in the periphery of the extrusion push plate 25. The rolling parts 24 are made of stainless steel and can roll freely on the periphery of the extrusion push plate 25. The inner cavity wall of the sliding part 3 is provided with a spiral rolling groove 26. The rolling parts 24 are correspondingly engaged in the two spiral rolling grooves 26 and can roll freely in the spiral rolling grooves 26. When the rolling parts 24 roll in the spiral rolling grooves 26, the extrusion push plate 25 can rotate in the inner cavity of the sliding part 3 and can move along the sliding part 3. The axial movement occurs when the water receiving tray 4 exerts an upward elastic resisting force on the extrusion push plate 25. The extrusion push plate 25 moves upward relative to the sliding part 3 within the sliding part 3, and the rolling part 24 on the periphery of the extrusion push plate 25 rolls within the spiral rolling groove 26. This allows the extrusion push plate 25 to roll within the spiral rolling groove 26 via the rolling part 24, thereby enabling the extrusion push plate 25 to rotate. When the extrusion push plate 25 rotates, the scraper 27 can drive the condensate in the water storage space to the opening of the air extraction hole 15, so that the condensate can be quickly extracted. Combination Figures 3 to 10 As shown, and please refer to the following: Figure 3 , Figure 5and Figure 8 The upper and lower ends of the suction pipe 6 are each fixedly fitted with a mounting part 10. A small motor 9 is vertically mounted on the upper mounting part 10. The motor shaft of the small motor 9 is driven by a first ball screw 11 via a coupling 12. The lower end of the first ball screw 11 is rotatably connected to another mounting part 10 via a bearing. A connecting arm 16 is fixedly connected to the periphery of the sliding part 3. A first screw nut 19 is fixedly embedded in the connecting arm 16. The first screw nut 19 is fitted on the periphery of the first ball screw 11 and forms a rolling screw drive with the first ball screw 11. That is, when the first... When the ball screw 11 rotates, the first screw nut 19 will move linearly along the axial direction of the first ball screw 11 on the periphery of the first ball screw 11. This will cause the motor shaft of the small motor 9 to rotate, which will drive the first ball screw 11 to rotate. This will allow the first screw nut 19 to drive the connecting arm 16 to move up and down, thereby driving the sliding part 3 to slide on the periphery of the suction pipe 6. When the sliding part 3 moves downward, it will cause the water receiving tray 4 to gradually contact the extrusion push plate 25, and the water receiving tray 4 will drive the extrusion push plate 25 to move upward relative to the sliding part 3. Combination Figures 3 to 10 As shown, and please refer to the following: Figure 5 , Figure 7 and Figure 8A ring-shaped protrusion is coaxially fixed to the top of the sliding part 3. A rotating part 17 is rotatably connected to the periphery of the ring-shaped protrusion via a mounting bearing. A winding roller 14 is vertically fixed to the upper end face of the rotating part 17. A thin film (not shown in the figure) is wound on the winding roller 14. One end of the unwound film is adhered to the periphery of the suction pipe 6. The rotating part 17 is coaxial with the sliding part 3, and a gear is provided on the periphery of the rotating part 17. A second lead screw nut 21 is vertically rotatably connected to the connecting arm 16 via a mounting bearing. A second ball screw 13 is vertically fixed between the two mounting parts 10. The second ball screw 13 passes through the second lead screw nut 21 and forms a rolling screw drive with the second lead screw nut 21. This allows the second lead screw nut 21 to rotate when it moves on the periphery of the second ball screw 13. Additionally, the second... A connecting sleeve 20 is coaxially fixed to the upper end face of the lead screw nut 21. The second lead screw nut 21 can rotate synchronously with the connecting sleeve 20. A small gear 18 is fixedly fitted around the periphery of the connecting sleeve 20. The small gear 18 and the gear part on the periphery of the rotating part 17 form a meshing transmission connection. When the sliding part 3 moves downward, the second lead screw nut 21 will slide on the periphery of the second ball screw 13. Since the second lead screw nut 21 and the second ball screw 13 form a rolling helical transmission, the second lead screw nut 21 can rotate, which in turn causes the connecting sleeve 20 and the small gear 18 to rotate. When the small gear 18 rotates, it will drive the rotating part 17 to rotate through the meshing transmission between the small gear 18 and the gear part on the periphery of the rotating part 17. When the rotating part 17 rotates, it will drive the winding roller 14 to rotate around the suction pipe 6.

[0021] Working principle of the invention: During long-term operation, the heat accumulated inside the cabinet 5 will be detected by a temperature and humidity sensor. The temperature and humidity sensor will transmit the detected signal data to an external controller. The external controller will control the cooling fan 1 to start. After the cooling fan 1 starts, it will force air to be drawn out and ventilated inside the cabinet 5 through the air extraction hole 15. Since the air extraction hole 15 is distributed in multiple positions on the upper and lower sides of the cabinet 5, the air extraction and ventilation inside the cabinet 5 can be relatively uniform. When the ambient temperature is low, in order to avoid condensation on the surface of the air extraction pipe 6, the external controller will control the small motor 9 to start. When the small motor 9 starts, it will drive the first ball screw 11 to rotate through the coupling 12. It will be connected to the first ball screw 11 and the first screw nut 19 through the rolling screw transmission, thereby driving the first screw nut 19 to move downward, which will drive multiple sliding parts 3 to move downward synchronously. When the sliding part 3 moves downward, it will cause the sponge to slide on the surface of the exhaust pipe 6. During the sliding process, the sponge can absorb the condensate water attached to the surface of the exhaust pipe 6. As the sliding part 3 continues to move downward, the sliding part 3 will gradually approach the water receiving tray 4. When the water receiving tray 4 passes through the annular hole of the stop ring 23 and contacts the lower surface of the extrusion push plate 25, it will generate an upward extrusion force on the extrusion push plate 25, causing the extrusion push plate 25 to move relative to the sliding part 3. The extrusion push plate 25 will extrude pressure on the sponge, so that the condensate water absorbed in the sponge can flow into the water storage space through the water outlet 22 and the central hole of the extrusion push plate 25, and then flow into the exhaust hole 15. The negative pressure airflow generated by the cooling fan 1 will be able to discharge the condensate water to the outside of the cabinet 5, or at least it will not adhere to the outer wall of the exhaust pipe 6. When the extrusion pusher 25 moves upward relative to the sliding part 3, it causes the rolling part 24 to roll within the spiral rolling groove 26, allowing the extrusion pusher 25 to rotate. The rotation of the extrusion pusher 25 causes the scraper 27 to rotate, thereby driving the condensate in the water storage space to the air extraction hole 15 for timely and rapid discharge. Additionally, when the sliding part 3 moves downward on the air extraction pipe 6, it causes the second lead screw nut 21 and the second ball screw 13 to rotate in a spiral drive. Since the second ball screw 13 is fixed, while the second lead screw nut 21 is rotatably connected to the connecting arm 16, the second lead screw nut 21 will rotate, driving the pinion 18 to rotate. When the pinion 18 rotates, it meshes with the gear on the rotating part 17, thereby enabling the winding roller 14 to wind around the air extraction pipe. When the winding roller 14 rotates, it can unwind the film on the winding roller 14 and wind it around the periphery of the suction pipe 6. As the sliding part 3 moves downwards in sync, the film can be wrapped around the periphery of the suction pipe 6, thus covering the periphery of the suction pipe 6. After the film is covered, the surface of the suction pipe 6 can temporarily isolate external moisture and heat. This can produce an anti-condensation effect on the surface of the suction pipe 6 above the sliding part 3 during the downward movement of the sliding part 3. When the condensate in the sponge is squeezed out, the small motor 9 will rotate in the opposite direction and make the sliding part 3 move upwards. When the sliding part 3 moves upwards, it will cause the winding roller 14 to rotate in the opposite direction around the axis of the suction pipe 6, thereby winding up the film on the suction pipe 6, so that the film on the suction pipe 6 can be rewound onto the winding roller 14.

[0022] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A switch cabinet with forced ventilation and dehumidification functions, comprising a cabinet body (5) and a cooling fan (1), wherein the cooling fan (1) is mounted on the cabinet body (5), characterized in that, The cabinet (5) is also provided with an exhaust pipe (6), and an exhaust hole (15) is provided on the exhaust pipe (6). The exhaust pipe (6) is connected to the air inlet of the cooling fan (1). The suction pipe (6) is fitted with a sliding part (3) that can slide along its axial direction. A water-absorbing component for absorbing condensate on the surface of the suction pipe (6) is installed inside the sliding part (3). A water receiving tray (4) is provided on the air extraction pipe (6) along the sliding path of the sliding part (3). The sliding part (3) is configured to cooperate with the water receiving tray (4) to squeeze the water-absorbing member when sliding downwards, and to guide the squeezed-out condensate into the air extraction hole (15).

2. A switch cabinet with forced ventilation and dehumidification functions according to claim 1, characterized in that, The sliding part (3) is also slidably installed with a squeezing push plate (25), and the water-absorbing component is an annular sponge, which is installed between the squeezing push plate (25) and the inner top wall of the sliding part (3); The extrusion push plate (25) is provided with a water outlet groove (22) through which water flows. When the sliding part (3) slides downward, the water receiving tray (4) passes through the bottom opening of the sliding part (3) and abuts against the squeezing push plate (25), driving the squeezing push plate (25) to move upward to squeeze the sponge.

3. A switch cabinet with forced ventilation and dehumidification functions according to claim 2, characterized in that, A scraper (27) is fixed to the lower surface of the extrusion push plate (25). The extrusion push plate (25) is provided with a rotating mechanism. The rotating mechanism is used to drive the extrusion push plate (25) to rotate. The scraper (27) rotates with the extrusion push plate (25) to drive the condensate in the water receiving tray (4) to the air extraction hole (15).

4. A switch cabinet with forced ventilation and dehumidification functions according to claim 3, characterized in that, The rotating mechanism includes a rolling part (24) rotatably connected to the periphery of the extrusion push plate (25), and a spiral rolling groove (26) is provided on the inner wall of the sliding part (3), and the rolling part (24) is inserted into the spiral rolling groove (26); When the extrusion push plate (25) moves upward under the pushing force of the water receiving tray (4), the rolling part (24) rolls along the spiral rolling groove (26), driving the extrusion push plate (25) to rotate.

5. A switch cabinet with forced ventilation and dehumidification functions according to claim 1, characterized in that, The cabinet (5) is also provided with a drive mechanism for driving the sliding part (3) to move up and down. The drive mechanism includes a mounting part (10) installed on the exhaust pipe (6), a first ball screw (11) rotatably connected to the mounting part (10), and a first screw nut (19) cooperating with the first ball screw (11). The first lead screw nut (19) is fixedly connected to the sliding part (3) via the connecting arm (16).

6. A switch cabinet with forced ventilation and dehumidification functions according to claim 5, characterized in that, The top of the sliding part (3) is rotatably connected to a rotating part (17), and a winding roller (14) is connected to the rotating part (17). A film is wound on the winding roller (14), and the free end of the film is connected to the air extraction pipe (6). The drive mechanism also includes a linkage component for driving the rotating part (17) to rotate.

7. A switch cabinet with forced ventilation and dehumidification functions according to claim 6, characterized in that, The linkage assembly includes a fixed second ball screw (13) and a second screw nut (21) rotatably connected to the connecting arm (16). The second screw nut (21) is fitted on the second ball screw (13) and is connected to the rotating part (17) for transmission. When the sliding part (3) moves up and down, the second lead screw nut (21) moves and rotates along the second ball screw (13), driving the rotating part (17) to rotate to take in and release the film.

8. A switch cabinet with forced ventilation and dehumidification functions according to claim 7, characterized in that, A connecting sleeve (20) is coaxially fixed to the second lead screw nut (21), and a small gear (18) is fixedly fitted on the connecting sleeve (20). The circumference of the rotating part (17) is provided with a gear part that meshes with the small gear (18).

9. A switch cabinet with forced ventilation and dehumidification functions according to claim 1, characterized in that, An air extraction chamber (8) is installed on the air inlet side of the cooling fan (1), and the air extraction chamber (8) is connected to the upper end of the air extraction pipe (6) through a bend (7). The lower end of the suction pipe (6) is closed, and multiple suction holes (15) are provided and distributed along the axial direction of the suction pipe (6). The water receiving tray (4) is located below the suction holes (15).

10. A switch cabinet with forced ventilation and dehumidification functions according to claim 2, characterized in that, A stop ring (23) is fixedly installed at the lower end of the sliding part (3). The stop ring (23) is used to limit the downward movement of the extrusion push plate (25). The outer diameter of the water receiving tray (4) is adapted to the inner diameter of the stop ring (23).

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