Low-voltage switch cabinet with good on-off effect

Abstract

The application belongs to the technical field of low-voltage switch cabinets, and particularly relates to a low-voltage switch cabinet with good on-off effect, which comprises a cabinet body, an exhaust cavity is formed at the bottom of the cabinet body, an exhaust box is fixedly installed at the top of the cabinet body, a filter screen plate is installed on the side wall of the exhaust box, a plurality of drawers are slidably connected in the cabinet body, an auxiliary heat dissipation box is fixedly connected to the back of the cabinet body, when a second motor drives a rotating shaft to rotate to adjust the position of a movable seat, the rotation of the rotating shaft can drive a linkage shaft to rotate through a belt loop and a belt pulley, the linkage shaft is meshed with one of the transmission shafts through a bevel gear, therefore, when the rotating shaft rotates, the transmission shaft can drive the annular dehumidification net to rotate, the position of the drying agent arranged in the annular dehumidification net is adjusted, the dehumidification effect is improved, air with high humidity is avoided from entering the cabinet body as much as possible, corrosion of the electrical components is avoided, and the on-off effect of the electrical components is not affected.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of low-voltage switch cabinets, and particularly relates to a low-voltage switch cabinet with good on-off effect. BACKGROUND

[0002] A low-voltage switch cabinet is a power distribution equipment used in a power system, mainly used for managing, controlling and protecting electrical equipment in the power system to ensure the safe and reliable distribution of power, and is widely used in various buildings, power facilities and industrial sites. The low-voltage switch cabinet can be divided into three main types of fixed type, drawer type and box type according to the structure and purpose, and the drawer type low-voltage switch cabinet is widely used due to its modular and flexible design.

[0003] A low-voltage switch cabinet is disclosed in Chinese Patent No. CN119275733B, which solves the problem that the existing low-voltage switch cabinet lacks targeted overall heat dissipation, resulting in unnecessary energy waste, and cannot concentrate heat dissipation to high-load or high-heat drawers, which may cause overheating and performance degradation of the equipment. However, the above-mentioned low-voltage switch cabinet lacks a dehumidification structure. If the installation environment of the low-voltage switch cabinet is humid, the water vapor in the air is drawn into the low-voltage switch cabinet through the heat dissipation structure, which is easy to condense in the low-voltage switch cabinet. Not only will it cause corrosion to the electrical components in the low-voltage switch cabinet, but it may also cause short circuit of the electrical components in the low-voltage switch cabinet, affecting the on-off effect of the low-voltage switch cabinet. SUMMARY

[0004] The purpose of the present application is to provide a low-voltage switch cabinet with good on-off effect, which is simple in structure and reasonable in design.

[0005] The present application achieves the above-mentioned purposes through the following technical solutions:

[0006] A low-voltage switch cabinet with good on-off effect, comprising a cabinet body, wherein the bottom of the cabinet body forms an exhaust cavity, a suction box is fixedly installed on the top of the cabinet body, a filter screen is installed on the side wall of the suction box, a plurality of drawers are slidably connected in the cabinet body, a bottom hole is formed in the bottom wall of the drawer, an auxiliary heat dissipation box is fixedly connected to the back of the cabinet body, an adjusting assembly is installed in the auxiliary heat dissipation box, an auxiliary heat dissipation structure is installed on the adjusting assembly, a second motor is installed on the top wall of the suction box for driving the adjusting assembly to move, an air inlet is formed in the bottom wall of the suction box and communicates with the inside of the cabinet body, a rectangular frame is fixedly connected to the top of the air inlet, a group of support plates is arranged on both sides of the rectangular frame, the bottom end of each support plate is fixedly connected to the inner cavity bottom wall of the suction box, a transmission shaft is rotatably connected between two support plates in each group, and an annular dehumidification net is sleeved on the two transmission shafts.

[0007] As a further optimization scheme of the present application, the cabinet body is provided with a support frame, both sides of the support frame are provided with guide rails, the bottom of the drawer is slidably connected with the support frame through the guide rails, a plurality of female plugs corresponding to the drawer are arranged on the inner side wall of the cabinet body, and auxiliary heat dissipation holes are formed in the inner side wall of the cabinet body on both sides of the female plugs.

[0008] As a further optimization scheme of the present application, the support frame is fixedly connected with a mounting plate at the top, an integrated heat dissipation structure is arranged above the mounting plate, the integrated heat dissipation structure comprises a fan cover, the bottom end of the fan cover is provided with a mounting ring, the fan cover is fixedly connected with the mounting plate through the mounting ring, a fan blade is arranged in the fan cover, and a first motor for driving the fan blade to rotate is arranged on the top of the fan cover.

[0009] As a further optimization scheme of the present application, the drawer is fixedly installed with a male plug on an outer wall at one end in the cabinet body, the male plug is arranged in position with the female plug, side holes are formed in the drawer on both sides of the male plug, gas collecting pipes arranged in position with the auxiliary heat dissipation holes are fixedly connected with the side holes, when the drawer is in a closed state, one end of the gas collecting pipe away from the drawer is inserted into the corresponding auxiliary heat dissipation hole, and a temperature sensor is installed on the drawer.

[0010] As a further optimization scheme of the present application, the adjusting assembly comprises a rotating shaft arranged in the auxiliary heat dissipation box, the bottom end of the rotating shaft is rotatably connected with the auxiliary heat dissipation box, the top end of the rotating shaft penetrates through the auxiliary heat dissipation box and extends into the air suction box, the top end of the rotating shaft is fixedly connected with the output end of the second motor, a reciprocating thread is arranged on the part of the rotating shaft in the cavity of the auxiliary heat dissipation box, guide rods are arranged on both sides of the rotating shaft, and the end portions of the guide rods are fixedly connected with the inner wall of the auxiliary heat dissipation box.

[0011] As a further optimization scheme of the present application, the auxiliary heat dissipation structure comprises a movable seat connected with the rotating shaft through a thread, guide rings are connected with both ends of the movable seat, the guide rings are slidably sleeved on the corresponding guide rods, an air suction fan and an air blowing fan are respectively arranged in the inner cavities of both ends of the movable seat, the inner cavity of the movable seat below the air suction fan is communicated with one end of an exhaust hose, the other end of the exhaust hose is communicated with the exhaust cavity, the inner cavity of the movable seat above the air blowing fan is communicated with one end of an air suction hose, and the other end of the air suction hose is communicated with the rectangular frame.

[0012] As a further optimization scheme of the present application, a plurality of infrared emitters are installed on the outer wall of one side of the cabinet body close to the auxiliary heat dissipation box, a plurality of the infrared emitters are respectively arranged in position with a plurality of the auxiliary heat dissipation holes, and an infrared receiver is installed on the side of the movable seat close to the infrared emitters.

[0013] As a further optimization scheme of the present application, the linkage structure comprises a linkage shaft rotatably connected to the bottom wall of the air extraction box, the linkage shaft and the top end of the rotating shaft are fixedly connected with belt pulleys, the two belt pulleys are drivingly connected through a belt, and one end of the transmission shaft and the middle section of the linkage shaft are fixedly provided with bevel gears.

[0014] As a further optimization scheme of the present application, the inside of the filter screen is provided with a dust baffle, and the end of the dust baffle is fixed to the inner wall of the air extraction box.

[0015] As a further optimization scheme of the present application, the middle section of the dust baffle is provided with a square hole, the output end of the second motor is fixedly connected with a metal spring plate arranged opposite to the square hole, the length of the metal spring plate is greater than the distance between the output end of the second motor and the filter screen, and the side wall of the air extraction box below the filter screen is provided with a dust discharge hole.

[0016] The present application has the following advantages:

[0017] 1. The temperature sensor installed on the drawer can transmit the detected temperature information to the total controller, and the total controller can control the second motor to drive the rotating shaft to rotate and move the movable seat after receiving the information, cooperate with the positioning effect of the infrared receiver and the infrared emitter, move the movable seat to the rear of the drawer with the highest temperature, and form a vortex in the drawer by cooperating the air blowing fan and the air extraction fan, so as to perform targeted auxiliary heat dissipation on the drawer, thereby avoiding the situation that the integrated heat dissipation mode cannot concentrate heat dissipation on the high-load or high-heat drawer, and the equipment in the high-load or high-heat drawer is overheated and the performance is reduced.

[0018] 2. When the second motor drives the rotating shaft to rotate to adjust the position of the movable seat, the rotating shaft can drive the linkage shaft to rotate through the belt and the belt pulley, and the linkage shaft and one of the transmission shafts are engaged through the bevel gears, so that the rotating shaft can drive the annular dehumidification net to rotate through the transmission shaft, and the desiccant in the annular dehumidification net below the transmission shaft is rotated to above the transmission shaft, which not only has good dehumidification effect, but also greatly prolongs the service life of the desiccant, and the desiccant does not need to be replaced frequently, which is convenient to use.

[0019] 3. While the second motor drives the annular dehumidification net to rotate, the second motor can also drive the metal spring plate to rotate, the metal spring plate can scrape the filter screen through the square hole during the rotating process, the filter screen vibrates, the dust and impurities attached to the filter screen are vibrated off through the vibration effect, the vibrated dust falls on the dust baffle under the action of airflow and gravity, and finally is discharged through the dust discharge hole, which dredges the mesh of the filter screen and prevents the mesh of the filter screen from being blocked to affect heat dissipation. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the schematic diagram of the whole structure of the present application;

[0021] Figure 2 is the schematic diagram of the cross-section structure of the present application;

[0022] Figure 3 is the schematic diagram of the connection between the drawer and the support frame of the present application;

[0023] Figure 4 is the schematic diagram of the drawer structure of the present application;

[0024] Figure 5 is the schematic diagram of the integrated heat dissipation structure of the present application;

[0025] Figure 6 is the schematic diagram of the internal structure of the auxiliary heat dissipation box of the present application;

[0026] Figure 7 is the schematic diagram of the installation of the auxiliary heat dissipation structure of the present application;

[0027] Figure 8 is the schematic diagram of the internal structure of the air extraction box of the present application;

[0028] Figure 9 is the schematic diagram of the installation position of the pulley, bevel gear and linkage shaft of the present application.

[0029] In the figure: 11, cabinet body; 12, exhaust cavity; 13, air extraction box; 14, filter screen; 15, support frame; 16, guide rail; 17, auxiliary heat dissipation hole; 18, female plug; 19, mounting plate; 101, infrared emitter; 21, drawer; 22, male plug; 23, wiring terminal; 24, knob switch; 25, temperature sensor; 26, handle; 27, bottom hole; 28, side hole; 29, gas collecting pipe; 31, fan cover; 32, mounting ring; 33, first motor; 34, fan blade; 41, auxiliary heat dissipation box; 42, rotating shaft; 43, reciprocating thread; 44, second motor; 45, guide rod; 51, movable seat; 52, guide ring; 53, air extraction fan; 54, air blowing fan; 55, infrared receiver; 56, exhaust hose; 57, air extraction hose; 61, sub-controller; 71, rectangular frame; 72, support plate; 73, transmission shaft; 74, annular dehumidification screen; 81, linkage shaft; 82, pulley; 83, belt loop; 84, bevel gear; 91, dust baffle; 92, square hole; 93, metal elastic sheet; 94, dust discharge hole. DETAILED DESCRIPTION

[0030] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0031] Example: Figure 1 - Figure 9 As shown, a low-voltage switchgear with good switching effect includes a cabinet 11. A support frame 15 is provided inside the cabinet 11. Guide rails 16 are installed on both sides of the support frame 15. Drawers 21 for placing electrical components are slidably connected to the guide rails 16. A female plug 18 is installed on the inner side wall of the cabinet 11. A male plug 22, which is aligned with the female plug 18, is installed on one end of the drawer 21 inside the cabinet 11. A terminal block 23, which is electrically connected to the male plug 22, is installed inside the drawer 21. After the user installs the electrical components in the drawer 21, the electrical components can be connected to the terminal block 23. When the drawer 21 slides into the cabinet 11, the electrical components in the drawer 21 can be electrically connected to external electrical equipment through the male plug 22 and the female plug 18.

[0032] A rotary switch 24 is installed on one end of drawer 21 outside cabinet 11 to control the on / off state of male plug 22 and female plug 18. A handle 26 is fixedly connected to drawer 21 below rotary switch 24, so that users can open and close drawer 21 by using handle 26.

[0033] Each of the drawers 21 has a bottom hole 27. A mounting plate 19 is fixedly installed on the top of the support frame 15. A fan cover 31 is installed above the mounting plate 19. The bottom periphery of the fan cover 31 is fixed to the mounting plate 19 by a mounting ring 32. A fan blade 34 is installed inside the fan cover 31. A first motor 33 for driving the fan blade 34 to rotate is installed on the fan cover 31. An exhaust chamber 12 is formed at the bottom of the cabinet 11. An exhaust hole is opened on one side wall of the exhaust chamber 12. When the first motor 33 drives the fan blade 34 to rotate, the hot air in the drawers 21 is discharged into the exhaust chamber 12 through the bottom hole 27. Finally, the hot air is discharged through the exhaust hole, realizing synchronous heat dissipation of the electrical components in the drawers 21.

[0034] An extraction box 13 is fixedly installed on the top of the cabinet 11. An air inlet communicating with the interior of the cabinet 11 is opened on the bottom wall of the extraction box 13. A rectangular frame 71 is fixedly connected to the top periphery of the air inlet. A filter screen 14 is installed on the back side wall of the extraction box 13. When the hot air in the drawer 21 is discharged, under the action of negative pressure, the cold air in the external environment enters the cabinet 11 through the filter screen 14 and the air inlet. The filter screen 14 can filter dust and impurities in the air, and minimize the entry of dust and impurities into the drawer 21, so as to affect the normal operation of the electrical components installed in the drawer 21.

[0035] The auxiliary heat dissipation box 41 is installed on the back of the cabinet body 11, and a plurality of groups of auxiliary heat dissipation holes 17 corresponding to the drawers 21 are arranged on the side of the cabinet body 11 close to the auxiliary heat dissipation box 41. An infrared emitter 101 is installed between the two auxiliary heat dissipation holes 17 in each group. The side hole 28 is arranged on the side wall of the drawer 21 on both sides of the male plug 22, and the gas collecting pipe 29 is fixedly connected to the side of the side hole 28. When the drawer 21 is in a closed state, the gas collecting pipe 29 is inserted into the corresponding side hole 28.

[0036] The auxiliary heat dissipation box 41 is installed on the back of the cabinet body 11, and a plurality of groups of auxiliary heat dissipation holes 17 corresponding to the drawers 21 are arranged on the side of the cabinet body 11 close to the auxiliary heat dissipation box 41. An infrared emitter 101 is installed between the two auxiliary heat dissipation holes 17 in each group. The side hole 28 is arranged on the side wall of the drawer 21 on both sides of the male plug 22, and the gas collecting pipe 29 is fixedly connected to the side of the side hole 28. When the drawer 21 is in a closed state, the gas collecting pipe 29 is inserted into the corresponding side hole 28.

[0037] The auxiliary heat dissipation box 41 is installed on the back of the cabinet body 11, and a plurality of groups of auxiliary heat dissipation holes 17 corresponding to the drawers 21 are arranged on the side of the cabinet body 11 close to the auxiliary heat dissipation box 41. An infrared emitter 101 is installed between the two auxiliary heat dissipation holes 17 in each group. The side hole 28 is arranged on the side wall of the drawer 21 on both sides of the male plug 22, and the gas collecting pipe 29 is fixedly connected to the side of the side hole 28. When the drawer 21 is in a closed state, the gas collecting pipe 29 is inserted into the corresponding side hole 28.

[0038] The inner cavities at both ends of the movable seat 51 are respectively provided with an air suction fan 53 and an air blowing fan 54, the movable seat 51 below the air suction fan 53 is communicated with one end of an air exhaust hose 56, the other end of the air exhaust hose 56 is communicated with the air exhaust cavity 12, the movable seat 51 above the air blowing fan 54 is communicated with one end of an air suction hose 57, the other end of the air suction hose 57 is communicated with the rectangular frame 71, when the infrared receiver 55 installed on the movable seat 51 moves to the position opposite to the opened infrared emitter 101, the second motor 44 stops rotating, at this time, the air blowing fan 54 cooperates with the air suction hose 57 to blow air into the drawer 21 with the highest temperature through one of the auxiliary heat dissipation holes 17, and the air suction fan 53 cooperates with the air exhaust hose 56 to exhaust the high-temperature gas in the drawer 21, so that the vortex is formed in the drawer 21 to quickly exhaust the heat in the drawer 21, thereby realizing the targeted auxiliary heat dissipation of the drawer 21 with the highest temperature.

[0039] A set of support plates 72 are arranged on both sides of the rectangular frame 71, the bottom ends of the support plates 72 are fixedly connected with the bottom wall of the inner cavity of the air suction box 13, two support plates 72 in each set are rotatably connected with a transmission shaft 73, the same annular dehumidification net 74 is sleeved on the two transmission shafts 73, a drying agent is arranged in the annular dehumidification net 74, the drying agent can be silica gel drying agent, the annular dehumidification net 74 is in transmission connection with the transmission shaft 73, and the bottom of the annular dehumidification net 74 is attached to the top of the rectangular frame 71, before the air in the external environment enters the cabinet 11 through the air inlet below the rectangular frame 71, the annular dehumidification net 74 can adsorb the water vapor in the air through the internal drying agent, so that the cold air entering the cabinet 11 is dehumidified.

[0040] The bottom wall of the air suction box 13 is rotatably connected with a linkage shaft 81, the linkage shaft 81 and the top end of the rotating shaft 42 are fixedly connected with a belt pulley 82, the two belt pulleys 82 are in transmission connection through a belt 83, the end of one transmission shaft 73 and the middle segment of the linkage shaft 81 are fixedly sleeved with a bevel gear 84, the two bevel gears 84 are in meshing with each other, when the second motor 44 drives the rotating shaft 42 to rotate to adjust the position of the movable seat 51, the rotating shaft 42 drives one of the transmission shafts 73 to synchronously rotate through the linkage shaft 81, the belt pulley 82, the belt 83 and the bevel gear 84, the transmission shaft 73 drives the annular dehumidification net 74 to rotate in the process of rotating, so that the position of the annular dehumidification net 74 is adjusted, the drying agent in the annular dehumidification net 74 below the transmission shaft 73 is rotated to above the transmission shaft 73, not only the dehumidification effect is good, but also the service life of the drying agent is greatly prolonged, so that the drying agent does not need to be replaced frequently, and the use is convenient.

[0041] The inside of the filter screen plate 14 is provided with a dust baffle 91, the end of the dust baffle 91 is fixed with the inner wall of the air suction box 13, the middle section of the dust baffle 91 is provided with a square hole 92, the output end of the second motor 44 is fixedly connected with a metal spring piece 93 which is arranged in the square hole 92, the length of the metal spring piece 93 is greater than the distance between the output end of the second motor 44 and the filter screen plate 14, the sidewall of the air suction box 13 below the filter screen plate 14 is provided with a dust discharge hole 94, when the second motor 44 drives the rotating shaft 42 to rotate to adjust the position of the movable seat 51, the metal spring piece 93 can also be driven to rotate, the metal spring piece 93 can scrape the filter screen plate 14 during the rotating process, so that the filter screen plate 14 vibrates, the dust and impurities attached to the filter screen plate 14 are shaken off by using the vibration effect, the shaken dust falls on the dust baffle 91 under the action of air flow and gravity, and finally is discharged through the dust discharge hole 94, so that the purpose of dredging the mesh of the filter screen plate 14 and preventing the mesh of the filter screen plate 14 from being blocked is achieved.

[0042] It should be noted that, in use, the electrical components are installed in the corresponding drawer 21, and the electrical components are electrically connected to the male plug 22 installed on the drawer 21 through the wiring terminal 23, when the drawer 21 is slid into the cabinet body 11 along the guide rail 16, the male plug 22 is inserted with the female plug 18 installed on the inner wall of the cabinet body 11, so that the electrical components and external electrical components are electrically connected;

[0043] The first motor 33 is started to drive the fan blade 34 in the wind shield 31 to rotate, the external air is conveyed into each drawer 21 through the filter screen plate 14 and the rectangular frame 71 installed at the top of the air inlet under the suction force generated by the rotation of the fan blade 34, and the hot air in the drawer 21 moves downward to the exhaust cavity 12 under the action of air pressure, and finally is discharged through the exhaust hole, so that the multiple drawers 21 are integrated and cooled;

[0044] The temperature sensor 25 installed on each drawer 21 detects the temperature inside the drawer 21, and sends the detected temperature information to the sub-controller 61 and the main controller. After receiving the temperature data, the main controller compares multiple temperature data. When it is detected that the temperature inside a certain drawer 21 exceeds the set value, the sub-controller 61 starts the infrared emitter 101 installed at the back of the drawer 21, and the main controller starts the second motor 44 to drive the rotating shaft 42 to rotate, which cooperates with the infrared emitter 101, the infrared receiver 55, and the movable seat 51 to move to the back of the corresponding drawer 21. At this time, the air blowing fan 54 cooperates with the auxiliary heat dissipation hole 17, the air collector 29, and the side hole 28 on one side of the drawer 21 to transport cold air to the inside of the drawer 21, while the air suction fan 53 cooperates with the auxiliary heat dissipation hole 17, the air collector 29, and the side hole 28 on the other side of the drawer 21 to suck out the high-temperature gas in the drawer 21, so that the gas circulates in the drawer 21 to form a vortex, and the drawer 21 with the highest temperature is subjected to targeted auxiliary heat dissipation, thereby avoiding the situation that the integrated heat dissipation method cannot concentrate heat dissipation on the high-load or high-heat drawer 21, and the equipment in the high-load or high-heat drawer 21 is overheated and its performance is reduced;

[0045] Before the cold air in the external environment enters the cabinet 11 through the air inlet at the bottom of the rectangular frame 71 to dissipate heat for the electrical elements in each drawer 21, the air passes through the annular dehumidification net 74 to absorb moisture in the air through the desiccant in the annular dehumidification net 74, thereby dehumidifying the air entering the cabinet 11 to reduce the humidity in the cabinet 11, avoid corrosion of the electrical elements in the low-voltage switch cabinet and cause short circuit of the electrical elements in the low-voltage switch cabinet, and ensure the on-off effect of the low-voltage switch cabinet.

[0046] When air is filtered through the filter screen plate 14, the linkage shaft 81 drives the transmission shaft 73 to rotate, drives the annular dehumidification net 74 in transmission connection with the transmission shaft 73 to rotate, adjusts the position of the annular dehumidification net 74, and rotates the desiccant in the annular dehumidification net 74 above the transmission shaft 73, which not only has good dehumidification effect, but also greatly prolongs the service life of the silica gel desiccant, so that the desiccant does not need to be replaced frequently and is convenient to use.

[0047] When the second motor 44 drives the rotating shaft 42 to rotate to adjust the position of the movable seat 51 and drives the annular dehumidification net 74 to rotate, the second motor 44 can also drive the metal spring 93 to rotate. The metal spring 93 can scrape the filter screen plate 14 through the square hole 92 during rotation, so that the filter screen plate 14 vibrates. The vibration can shake off the dust and impurities attached to the filter screen plate 14. The shaken-off dust falls on the dust baffle 91 under the action of air flow and gravity, and is finally discharged through the dust discharge hole 94. The vibration can dredge the mesh of the filter screen plate 14 to prevent the mesh of the filter screen plate 14 from being blocked and affecting heat dissipation.

[0048] The above embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but cannot be understood as a limitation on the patent scope of the present application. It should be noted that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application.

Claims

1. A low-voltage switchgear with good switching effect, comprising a cabinet (11), wherein an exhaust chamber (12) is formed at the bottom of the cabinet (11), an extraction box (13) is fixedly installed at the top of the cabinet (11), a filter screen (14) is installed on the side wall of the extraction box (13), and a plurality of drawers (21) are slidably connected inside the cabinet (11), wherein a bottom hole (27) is provided on the bottom wall of the drawer (21), characterized in that: The back of the cabinet (11) is fixedly connected with an auxiliary heat dissipation box (41), an adjusting assembly is installed in the auxiliary heat dissipation box (41), an auxiliary heat dissipation structure is installed on the adjusting assembly, a second motor (44) for driving the adjusting assembly to move is installed on the top wall of the air suction box (13), an air inlet communicating with the inside of the cabinet (11) is formed in the bottom wall of the air suction box (13), a rectangular frame (71) is fixedly connected to the top of the air inlet, a group of supporting plates (72) are arranged on the two sides of the rectangular frame (71), the bottom ends of the supporting plates (72) are fixedly connected with the bottom wall of the inner cavity of the air suction box (13), a transmission shaft (73) is rotatably connected between the two supporting plates (72) in each group, and an annular dehumidification net (74) is sleeved between the two transmission shafts (73), the annular dehumidification net (74) is in transmission connection with the transmission shafts (73), and one end of one of the transmission shafts (73) is in transmission connection with the adjusting assembly through a linkage structure. The adjusting assembly comprises a rotating shaft (42) arranged in the auxiliary heat dissipation box (41), the bottom end of the rotating shaft (42) is rotatably connected with the auxiliary heat dissipation box (41), the top end of the rotating shaft (42) rotatably penetrates through the auxiliary heat dissipation box (41) and extends into the air suction box (13), the top end of the rotating shaft (42) is fixedly connected with the output end of the second motor (44), and a reciprocating thread (43) is arranged on the part of the rotating shaft (42) in the inner cavity of the auxiliary heat dissipation box (41). Guiding rods (45) are arranged on the two sides of the rotating shaft (42), and the ends of the guiding rods (45) are fixedly connected with the inner wall of the auxiliary heat dissipation box (41). The linkage structure comprises a linkage shaft (81) rotatably connected to the bottom wall of the air suction box (13), a belt pulley (82) is fixedly connected to the top end of the linkage shaft (81) and the rotating shaft (42), the two belt pulleys (82) are in transmission connection through a belt ring (83), an umbrella gear (84) is fixedly sleeved on one end of the transmission shaft (73) and the middle segment of the linkage shaft (81), and the two umbrella gears (84) are in meshing connection with each other. A dust baffle (91) is arranged on the inner side of the filter screen plate (14), and the end of the dust baffle (91) is fixedly connected with the inner wall of the air suction box (13). A square hole (92) is formed in the middle segment of the dust baffle (91), a metal spring piece (93) is fixedly connected to the output end of the second motor (44) and arranged in position with the square hole (92), the length of the metal spring piece (93) is greater than the distance between the output end of the second motor (44) and the filter screen plate (14), and a dust discharge hole (94) is formed in the side wall of the air suction box (13) below the filter screen plate (14).

2. The low-voltage switchgear with good on-off effect according to claim 1, characterized in that: The cabinet (11) is provided with a support frame (15), both sides of the support frame (15) are provided with guide rails (16), the bottom of the drawer (21) is slidably connected with the support frame (15) through the guide rails (16), and the inner side wall of the cabinet (11) is provided with a plurality of female inserts (18) corresponding to the drawer (21).

3. The low-voltage switchgear with good on-off effect according to claim 2, characterized in that: The top of the support frame (15) is fixedly connected with a mounting plate (19), an integrated heat dissipation structure is arranged above the mounting plate (19), and the integrated heat dissipation structure comprises a fan cover (31). The bottom end of the fan cover (31) is provided with a mounting ring (32), the fan cover (31) is fixedly connected with the mounting plate (19) through the mounting ring (32), the fan cover (31) is provided with a fan blade (34), and the top of the fan cover (31) is provided with a first motor (33) for driving the fan blade (34) to rotate.

4. The low-voltage switchgear with good on-off effect according to claim 2, characterized in that: The drawer (21) is provided with a male plug (22) fixedly installed on one end of the outer wall in the cabinet (11), the male plug (22) is arranged in position with the female plug (18), the drawer (21) is provided with a side hole (28) on both sides of the male plug (22), the side hole (28) is fixedly connected with a gas collecting pipe (29) arranged in position with the auxiliary heat dissipation hole (17), when the drawer (21) is in a closed state, one end of the gas collecting pipe (29) away from the drawer (21) is inserted into the corresponding auxiliary heat dissipation hole (17), and the drawer (21) is provided with a temperature sensor (25).

5. The low-voltage switchgear with good on-off effect according to claim 2, characterized in that: The auxiliary heat dissipation structure comprises a movable seat (51) threadedly connected with the rotating shaft (42), guide rings (52) are connected to both ends of the movable seat (51), the guide rings (52) are slidably sleeved on the corresponding guide rods (45), an air suction fan (53) and an air blowing fan (54) are arranged in the inner cavities of both ends of the movable seat (51), respectively, the inner cavity of the movable seat (51) below the air suction fan (53) is communicated with one end of an exhaust hose (56), the other end of the exhaust hose (56) is communicated with the exhaust cavity (12), and the inner cavity of the movable seat (51) above the air blowing fan (54) is communicated with one end of an air suction hose (57), and the other end of the air suction hose (57) is communicated with the rectangular frame (71).

6. The low-voltage switchgear with good on-off effect according to claim 5, characterized in that: A plurality of infrared emitters (101) are installed on the outer wall of one side of the cabinet (11) close to the auxiliary heat dissipation box (41), a plurality of the infrared emitters (101) are arranged in position with a plurality of the auxiliary heat dissipation holes (17) respectively, and an infrared receiver (55) is installed on one side of the movable seat (51) close to the infrared emitters (101).

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