Low-voltage switch cabinet with good on-off effect

Abstract

The invention belongs to the technical field of low-voltage switch cabinets, and particularly relates to a low-voltage switch cabinet with a good on-off effect, which comprises a cabinet body, an exhaust cavity formed at the bottom of the cabinet body, an air exhaust box fixedly mounted at the top of the cabinet body, a filter screen plate mounted on the side wall of the air exhaust box, a plurality of drawers slidably connected in the cabinet body, and an auxiliary heat dissipation box 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 rotating shaft rotates to drive a linkage shaft to rotate through a belt ring and a belt pulley, the linkage shaft is meshed with one transmission shaft through a bevel gear, and therefore when the rotating shaft rotates, the annular dehumidification net can be driven to rotate through the transmission shaft; and the position of a drying agent arranged in the annular dehumidification net is adjusted, so that the dehumidification effect is improved, and the problems that air with relatively high humidity enters the cabinet body, easily corrodes electrical components and seriously affects the on-off effect of the electrical components are solved as much as possible.

Description

Technical Field

[0001] This invention belongs to the field of low-voltage switchgear technology, specifically relating to a low-voltage switchgear with good switching performance. Background Technology

[0002] Low-voltage switchgear is a type of power distribution equipment used in power systems. Its main function is to manage, control, and protect electrical equipment in power systems, ensuring the safe and reliable distribution of power. It is widely used in various buildings, power facilities, and industrial sites. Low-voltage switchgear can be divided into three main types according to its structure and purpose: fixed type, drawer type, and box type. Among them, drawer type low-voltage switchgear is widely used due to its modular and flexible design.

[0003] Chinese invention patent CN119275733B proposes a low-voltage switchgear that solves the problem of existing low-voltage switchgear's overall heat dissipation method lacking specificity, leading to unnecessary energy waste and failing to concentrate heat dissipation on high-load or high-heat drawers, which may cause equipment overheating and performance degradation. However, the aforementioned low-voltage switchgear lacks a dehumidification structure. If the low-voltage switchgear is installed in a humid environment, moisture in the air is drawn into the low-voltage switchgear through the heat dissipation structure and easily condenses inside the switchgear. This not only corrodes the electrical components inside the switchgear but may also cause short circuits in severe cases, affecting the switchgear's switching performance. Summary of the Invention

[0004] The purpose of this invention is to provide a low-voltage switchgear with a simple structure and reasonable design, and good switching performance, in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions: A low-voltage switchgear with good switching performance includes a cabinet body, an exhaust chamber formed at the bottom of the cabinet body, an extraction box fixedly installed at the top of the cabinet body, a filter screen plate installed on the side wall of the extraction box, multiple drawers slidably connected inside the cabinet body, bottom holes opened on the bottom wall of each drawer, an auxiliary heat dissipation box fixedly connected to the back of the cabinet body, an adjustment component installed inside the auxiliary heat dissipation box, an auxiliary heat dissipation structure installed on the adjustment component, a second motor for driving the adjustment component to move is installed on the top wall of the extraction box, an air inlet communicating with the interior of the cabinet body is opened on the bottom wall of the extraction box, a rectangular frame is fixedly connected to the top periphery of the air inlet, a set of support plates is provided on both sides of the rectangular frame, the bottom end of the support plate is fixedly connected to the bottom wall of the inner cavity of the extraction box, a drive shaft is rotatably connected between two support plates in each set, a common annular dehumidifying screen is sleeved between the two drive shafts, the annular dehumidifying screen is driven by the drive shaft, and the end of one of the drive shafts is driven by the adjustment component through a linkage structure.

[0006] As a further optimization of the present invention, a support frame is provided inside the cabinet, and guide rails are installed on both sides of the support frame. The bottom of the drawer is slidably connected to the support frame through the guide rails. Multiple female plugs corresponding to the drawers are installed on the inner side wall of the cabinet. Auxiliary heat dissipation holes are provided on the inner side wall of the cabinet on both sides of the female plugs.

[0007] As a further optimization of the present invention, a mounting plate is fixedly connected to the top of the support frame, and an integrated heat dissipation structure is provided above the mounting plate. The integrated heat dissipation structure includes a fan shroud, and a mounting ring is provided on the periphery of the bottom end of the fan shroud. The fan shroud is fixedly connected to the mounting plate through the mounting ring. Fan blades are provided inside the fan shroud, and a first motor for driving the fan blades to rotate is installed on the top of the fan shroud.

[0008] As a further optimization of the present invention, a male plug is fixedly installed on the outer wall of one end of the drawer located inside the cabinet. The male plug is aligned with the female plug. Side holes are opened on both sides of the drawer. A gas collecting pipe is fixedly connected to the side of the side hole and aligned with the auxiliary heat dissipation hole. When the drawer is closed, the end of the gas collecting pipe away from the drawer is inserted into the corresponding auxiliary heat dissipation hole. A temperature sensor is installed on the drawer.

[0009] As a further optimization of the present invention, the adjustment component includes a rotating shaft disposed in the auxiliary heat dissipation box, the bottom end of the rotating shaft being rotatably connected to the auxiliary heat dissipation box, the top end of the rotating shaft rotatably passing through the auxiliary heat dissipation box and extending into the air extraction box, the top end of the rotating shaft being fixedly connected to the output end of the second motor, the portion of the rotating shaft located in the inner cavity of the auxiliary heat dissipation box being provided with a reciprocating thread, and guide rods being provided on both sides of the rotating shaft, the ends of the guide rods being fixedly connected to the inner wall of the auxiliary heat dissipation box.

[0010] As a further optimization of the present invention, the auxiliary heat dissipation structure includes a movable seat with a middle section threadedly connected to the rotating shaft. Both ends of the movable seat are connected to guide rings, and the guide rings are slidably sleeved on the corresponding guide rods. An exhaust fan and a blower fan are respectively installed in the inner cavities at both ends of the movable seat. The movable seat below the exhaust fan is connected to one end of an exhaust hose, and the other end of the exhaust hose is connected to the exhaust cavity. The movable seat above the blower fan is connected to one end of an exhaust hose, and the other end of the exhaust hose is connected to the rectangular frame.

[0011] As a further optimization of the present invention, a plurality of infrared transmitters are installed on the outer wall of the cabinet near the auxiliary heat dissipation box, and the plurality of infrared transmitters are respectively arranged corresponding to the plurality of auxiliary heat dissipation holes. An infrared receiver is installed on the side of the movable seat near the infrared transmitter.

[0012] As a further optimization of the present invention, the linkage structure includes a linkage shaft rotatably connected to the bottom wall of the air extraction box. Both the linkage shaft and the top of the rotating shaft are fixedly connected to pulleys. The two pulleys are connected by a belt ring for transmission. One of the transmission shaft ends and the middle section of the linkage shaft are fixedly fitted with bevel gears. The two bevel gears mesh with each other.

[0013] As a further optimization of the present invention, a dust baffle is provided on the inner side of the filter screen, and the end of the dust baffle is fixed to the inner wall of the air extraction box.

[0014] As a further optimization of the present invention, a square hole is provided in the middle section of the dust baffle plate, and a metal spring sheet that is aligned with the square hole is fixedly connected to the output end of the second motor. The length of the metal spring sheet is greater than the distance between the output end of the second motor and the filter plate. A dust discharge hole is provided on the side wall of the air extraction box below the filter plate.

[0015] The beneficial effects of this invention are as follows: 1. The temperature sensor installed on the drawer can transmit the detected temperature information to the main controller. After receiving the information, the main controller can control the second motor to drive the shaft to rotate and move the movable seat. With the positioning function of the infrared receiver and infrared transmitter, the movable seat is moved to the rear of the drawer with the highest temperature. Using the air blower and exhaust fan, a vortex is formed in the drawer to provide targeted auxiliary heat dissipation. This avoids the situation where relying solely on integrated heat dissipation methods cannot concentrate heat dissipation on high-load or high-heat drawers, which may lead to the performance degradation of the equipment in the high-load or high-heat drawers due to overheating.

[0016] 2. When the second motor drives the rotating shaft to adjust the position of the movable seat, the rotation of the rotating shaft can drive the linkage shaft to rotate through the belt ring and belt pulley. The linkage shaft is connected to one of the transmission shafts through bevel gears. Therefore, when the rotating shaft rotates, it can drive the annular dehumidifying screen to rotate through the transmission shaft. By adjusting the position of the annular dehumidifying screen, the desiccant in the annular dehumidifying screen below the transmission shaft is rotated to the top of the transmission shaft. This not only has a good dehumidification effect, but also greatly extends the service life of the desiccant, eliminating the need for frequent replacement of the desiccant and making it convenient to use.

[0017] 3. While the second motor drives the annular dehumidifying screen to rotate, it can also drive the metal spring to rotate. During the rotation, the metal spring can pass through the square holes and scrape the filter screen plate, causing the filter screen plate to vibrate. This vibration shakes off the dust and impurities attached to the filter screen plate. The shaken dust falls onto the dust baffle plate under the action of airflow and gravity, and is finally discharged through the dust discharge hole, thus clearing the mesh of the filter screen plate and preventing the mesh of the filter screen plate from becoming clogged and affecting heat dissipation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the entire invention; Figure 3 This is a schematic diagram showing the connection between the drawer and the support frame of the present invention; Figure 4 This is a schematic diagram of the drawer structure of the present invention; Figure 5 This is a schematic diagram of the integrated heat dissipation structure of the present invention; Figure 6 This is a schematic diagram of the internal structure of the auxiliary heat dissipation box of the present invention; Figure 7 This is a schematic diagram of the installation of the auxiliary heat dissipation structure of the present invention; Figure 8 This is a schematic diagram of the internal structure of the vacuum chamber of the present invention; Figure 9 This is a schematic diagram showing the installation positions of the pulley, bevel gear, and linkage shaft of the present invention.

[0019] In the diagram: 11. Cabinet; 12. Exhaust chamber; 13. Extraction box; 14. Filter screen; 15. Support frame; 16. Guide rail; 17. Auxiliary heat dissipation hole; 18. Female connector; 19. Mounting plate; 101. Infrared transmitter; 21. Drawer; 22. Male connector; 23. Terminal block; 24. Rotary switch; 25. Temperature sensor; 26. Handle; 27. Bottom hole; 28. Side hole; 29. ​​Air collection pipe; 31. Fan cover; 32. Mounting ring; 33. First motor; 34. Fan blade; 41. Auxiliary heat dissipation box; 4 2. Rotating shaft; 43. Reciprocating thread; 44. Second motor; 45. Guide rod; 51. Movable seat; 52. Guide ring; 53. Exhaust fan; 54. Blowing fan; 55. Infrared receiver; 56. Exhaust hose; 57. Suction hose; 61. Sub-controller; 71. Rectangular frame; 72. Support plate; 73. Drive shaft; 74. Annular dehumidifying mesh; 81. Linkage shaft; 82. Pulley; 83. Belt ring; 84. Bevel gear; 91. Dust baffle; 92. Square hole; 93. Metal spring; 94. Dust discharge hole. Detailed Implementation

[0020] 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.

[0021] Example: Figure 1 - Figure 9As 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] An auxiliary heat dissipation box 41 is installed on the back of the cabinet 11. Multiple sets of auxiliary heat dissipation holes 17 corresponding to the drawers 21 are opened on the side of the cabinet 11 near the auxiliary heat dissipation box 41. An infrared transmitter 101 is installed between two auxiliary heat dissipation holes 17 in each set. Side holes 28 are opened on the side walls of the drawers 21 on both sides of the male plug 22. A gas collection pipe 29 is fixedly connected to the side of the side hole 28. When the drawer 21 is closed, the gas collection pipe 29 is inserted into the corresponding side hole 28.

[0026] A rotating shaft 42 is provided inside the auxiliary heat dissipation box 41. The bottom end of the rotating shaft 42 is rotatably connected to the auxiliary heat dissipation box 41. The top end of the rotating shaft 42 rotates through the auxiliary heat dissipation box 41 and extends into the air extraction box 13. A second motor 44 is installed on the top wall of the inner cavity of the air extraction box 13. The top end of the rotating shaft 42 is fixedly connected to the output end of the second motor 44. A reciprocating thread 43 is provided on a section of the rotating shaft 42 located in the inner cavity of the auxiliary heat dissipation box 41. Guide rods 45 are provided on both sides of the rotating shaft 42. The ends of the guide rods 45 are fixed to the inner wall of the auxiliary heat dissipation box 41.

[0027] A movable seat 51 is screwed onto the rotating shaft 42 via a reciprocating thread 43. The two ends of the movable seat 51 are slidably connected to the guide rod 45 via guide rings 52. An infrared receiver 55 is installed on the side of the movable seat 51 near the infrared transmitter 101. A sub-controller 61 is installed on the drawer 21 and is connected to an external main controller. Each drawer 21 is equipped with a temperature sensor 25 for detecting the internal temperature of the drawer 21. The temperature sensor 25 is connected to the external main controller via the sub-controller 61. The sub-controller 61 transmits the detected temperature data to the main controller. After receiving the temperature data, the main controller compares multiple temperature data and controls the infrared transmitter 101 behind the drawer 21 with the highest temperature to open via the sub-controller 61. At the same time, the main controller controls the second motor 44 to start and drive the rotating shaft 42 to rotate. The movable seat 51 is driven to move by the reciprocating thread 43 on the rotating shaft 42 in conjunction with the guiding action of the guide rod 45.

[0028] An exhaust fan 53 and an air blower 54 are respectively installed in the inner cavities at both ends of the movable base 51. The movable base 51 below the exhaust fan 53 is connected to one end of the exhaust hose 56, and the other end of the exhaust hose 56 is connected to the exhaust chamber 12. The movable base 51 above the air blower 54 is connected to one end of the exhaust hose 57, and the other end of the exhaust hose 57 is connected to the rectangular frame 71. When the infrared receiver 55 installed on the movable base 51 moves to align with the open infrared transmitter 101, the second motor 44 stops rotating. At this time, the air blower 54, together with the exhaust hose 57, blows air into the drawer 21 with the highest temperature through one of the auxiliary heat dissipation holes 17. Meanwhile, the exhaust fan 53, together with the exhaust hose 56, discharges the high-temperature gas from the drawer 21, forming a vortex in the drawer 21 and quickly dissipating the heat from the drawer 21, thus achieving targeted auxiliary heat dissipation for the drawer 21 with the highest temperature.

[0029] A set of support plates 72 are provided on both sides of the rectangular frame 71. The bottom end of the support plate 72 is fixedly connected to the bottom wall of the inner cavity of the air extraction box 13. A drive shaft 73 is rotatably connected between the two support plates 72 in each set. The same annular dehumidifying net 74 is sleeved between the two drive shafts 73. The annular dehumidifying net 74 is filled with desiccant, such as silica gel desiccant. The annular dehumidifying net 74 is connected to the drive shaft 73. The bottom of the annular dehumidifying 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 dehumidifying net 74 can adsorb the moisture in the air through the desiccant inside, thus dehumidifying the cold air entering the cabinet 11.

[0030] A linkage shaft 81 is rotatably connected to the bottom wall of the extraction box 13. Both the linkage shaft 81 and the top of the rotating shaft 42 are fixedly connected to pulleys 82. The two pulleys 82 are connected by a belt ring 83. A bevel gear 84 is fixedly fitted onto the end of one of the drive shafts 73 and the middle section of the linkage shaft 81. The two bevel gears 84 mesh with each other. When the second motor 44 drives the rotating shaft 42 to rotate and adjust the position of the movable seat 51, the rotating shaft 42, through the linkage shaft 81, pulleys 82, belt ring 83, and bevel gear 84, drives one of the drive shafts 73 to rotate synchronously. During rotation, the drive shaft 73 drives the annular dehumidification mesh 74 to rotate. Adjusting the position of the annular dehumidification mesh 74 rotates the desiccant inside the annular dehumidification mesh 74 below the drive shaft 73 to above the drive shaft 73. This not only provides good dehumidification but also greatly extends the service life of the desiccant, eliminating the need for frequent desiccant replacement and making it convenient to use.

[0031] A dust baffle 91 is provided on the inner side of the filter screen 14. The end of the dust baffle 91 is fixed to the inner wall of the air extraction box 13. A square hole 92 is opened in the middle section of the dust baffle 91. A metal spring 93 is fixedly connected to the output end of the second motor 44 and is aligned with the square hole 92. The length of the metal spring 93 is greater than the distance between the output end of the second motor 44 and the filter screen 14. A dust discharge hole 94 is opened on the side wall of the air extraction box 13 below the filter screen 14. When the second motor 44 drives the rotating shaft 42 to rotate, the adjustable... When the moving seat 51 is in position, it can also drive the metal spring 93 to rotate. During the rotation, the metal spring 93 can pass through the square hole 92 and scrape the filter screen plate 14, causing the filter screen plate 14 to vibrate. This vibration will shake off the dust and impurities attached to the filter screen plate 14. The dust that has been shaken off falls onto the dust baffle plate 91 under the action of airflow and gravity, and is finally discharged through the dust discharge hole 94, which serves to unclog the mesh of the filter screen plate 14 and prevent the mesh of the filter screen plate 14 from becoming clogged.

[0032] It should be noted that when using this type of low-voltage switchgear with good switching effect, the electrical components are installed in the corresponding drawers 21, and the electrical components are electrically connected to the male plugs 22 installed on the drawers 21 through the wiring terminals 23. When the drawer 21 is slid into the cabinet 11 along the guide rail 16, the male plugs 22 are plugged into the female plugs 18 installed on the inner wall of the cabinet 11, so that the electrical components can be electrically connected to the external electrical components. The first motor 33 is started to drive the fan blades 34 inside the fan cover 31 to rotate. The external air is delivered to each drawer 21 by the suction generated by the rotation of the fan blades 34 through the filter screen 14 and the rectangular frame 71 installed on the top of the air inlet. The hot air inside the drawer 21 moves down to the exhaust chamber 12 under the action of air pressure and is finally discharged through the exhaust hole, thus providing integrated heat dissipation for multiple drawers 21. Temperature sensors 25 installed on each drawer 21 detect the internal temperature of the drawer 21. The temperature sensors 25 send 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 points. When the temperature inside a drawer 21 exceeds a set value, the sub-controller 61 activates the infrared transmitter 101 installed at the rear of that drawer 21. Simultaneously, the main controller activates the second motor 44, which drives the rotating shaft 42 to rotate. This, in conjunction with the infrared transmitter 101 and the infrared receiver 55, moves the movable seat 51 to the rear of the corresponding drawer 21. The blower fan 54, through the auxiliary heat dissipation hole 17, the air collection pipe 29 and the side hole 28 on one side of the drawer 21, delivers cool air into one side of the drawer 21. The exhaust fan 53, through the auxiliary heat dissipation hole 17, the air collection pipe 29 and the side hole 28 on the other side of the drawer 21, extracts the high-temperature gas from the drawer 21, causing the gas to circulate and form a vortex inside the drawer 21. This provides targeted auxiliary heat dissipation to the drawer 21 with the highest temperature, thus avoiding the situation where relying solely on integrated heat dissipation methods cannot concentrate heat dissipation on the high-load or high-heat drawer 21, which could lead to a decrease in the performance of the equipment inside the high-load or high-heat drawer 21 due to overheating. Cold air from the external environment enters the cabinet 11 through the air inlet at the bottom of the rectangular frame 71. Before dissipating heat from the electrical components in each drawer 21, the air passes through the annular dehumidification mesh 74. The desiccant in the annular dehumidification mesh 74 adsorbs the moisture in the air, dehumidifying the air entering the cabinet 11. This reduces the humidity inside the cabinet 11, preventing corrosion of the electrical components in the low-voltage switchgear and short circuits, thus ensuring the switching effect of the low-voltage switchgear. When air is intake through the filter screen 14, the linkage shaft 81 drives the drive shaft 73 to rotate, which in turn drives the annular dehumidifying screen 74 connected to the drive shaft 73 to rotate. By adjusting the position of the annular dehumidifying screen 74, the desiccant in the annular dehumidifying screen 74 below the drive shaft 73 is rotated to above the drive shaft 73. This not only provides good dehumidification but also greatly extends the service life of the silica gel desiccant, eliminating the need for frequent desiccant replacement and making it convenient to use. While driving the rotating shaft 42 to rotate and adjust the position of the movable seat 51, and driving the annular dehumidifying screen 74 to rotate, the second motor 44 can also drive the metal spring 93 to rotate. During the rotation, the metal spring 93 can pass through the square hole 92 and scrape the filter screen plate 14, causing the filter screen plate 14 to vibrate. This vibration will shake off the dust and impurities attached to the filter screen plate 14. The shaken dust will fall onto the dust baffle plate 91 under the action of airflow and gravity, and finally be discharged through the dust discharge hole 94, thus clearing the mesh of the filter screen plate 14 and preventing the mesh of the filter screen plate 14 from becoming clogged and affecting heat dissipation.

[0033] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

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: An auxiliary heat dissipation box (41) is fixedly connected to the back of the cabinet (11). An adjustment component is installed inside the auxiliary heat dissipation box (41). An auxiliary heat dissipation structure is installed on the adjustment component. A second motor (44) for driving the adjustment component is installed on the top wall of the air extraction box (13). An air inlet communicating with the inside of the cabinet (11) is opened on the bottom wall of the air extraction box (13). A rectangular frame (71) is fixedly connected to the top periphery of the air inlet. A set of support plates (72) is provided on both sides of the rectangular frame (71). The bottom end of the support plate (72) is fixedly connected to the bottom wall of the inner cavity of the air extraction box (13). A drive shaft (73) is rotatably connected between the two support plates (72) in each set. The same annular dehumidification mesh (74) is sleeved between the two drive shafts (73). The annular dehumidification mesh (74) is connected to the drive shaft (73). The end of one of the drive shafts (73) is connected to the adjustment component through a linkage structure.

2. The low-voltage switchgear with good switching effect according to claim 1, characterized in that: The cabinet (11) is provided with a support frame (15), and guide rails (16) are installed on both sides of the support frame (15). The bottom of the drawer (21) is slidably connected to the support frame (15) through the guide rails (16). Multiple female plugs (18) corresponding to the drawer (21) are installed on the inner side wall of the cabinet (11). Auxiliary heat dissipation holes (17) are opened on the inner side wall of the cabinet (11) on both sides of the female plugs (18).

3. A low-voltage switchgear with good switching effect according to claim 2, characterized in that: The support frame (15) is fixedly connected to the top of the mounting plate (19), and an integrated heat dissipation structure is provided above the mounting plate (19). The integrated heat dissipation structure includes a fan shroud (31). A mounting ring (32) is provided on the bottom periphery of the fan shroud (31). The fan shroud (31) is fixedly connected to the mounting plate (19) through the mounting ring (32). A fan blade (34) is provided inside the fan shroud (31). A first motor (33) that drives the fan blade (34) to rotate is installed on the top of the fan shroud (31).

4. A low-voltage switchgear with good switching effect according to claim 2, characterized in that: A male connector (22) is fixedly installed on the outer wall of one end of the drawer (21) inside the cabinet (11). The male connector (22) is aligned with the female connector (18). Side holes (28) are opened on both sides of the drawer (21). A gas collection pipe (29) is fixedly connected to the side of the side hole (28) and is aligned with the auxiliary heat dissipation hole (17). When the drawer (21) is closed, the end of the gas collection pipe (29) away from the drawer (21) is inserted into the corresponding auxiliary heat dissipation hole (17). A temperature sensor (25) is installed on the drawer (21).

5. A low-voltage switchgear with good switching effect according to claim 2, characterized in that: The adjustment assembly includes a rotating shaft (42) disposed in the auxiliary heat dissipation box (41). The bottom end of the rotating shaft (42) is rotatably connected to the auxiliary heat dissipation box (41). The top end of the rotating shaft (42) rotates through the auxiliary heat dissipation box (41) and extends into the air extraction box (13). The top end of the rotating shaft (42) is fixedly connected to the output end of the second motor (44). The rotating shaft (42) is provided with a reciprocating thread (43) at the part located in the inner cavity of the auxiliary heat dissipation box (41). Guide rods (45) are provided on both sides of the rotating shaft (42). The ends of the guide rods (45) are fixedly connected to the inner wall of the auxiliary heat dissipation box (41).

6. A low-voltage switchgear with good switching effect according to claim 5, characterized in that: The auxiliary heat dissipation structure includes a movable seat (51) with the middle section threadedly connected to the rotating shaft (42). Both ends of the movable seat (51) are connected to guide rings (52). The guide rings (52) are slidably sleeved on the corresponding guide rods (45). An exhaust fan (53) and a blower fan (54) are respectively installed in the inner cavities at both ends of the movable seat (51). The movable seat (51) below the exhaust fan (53) is connected to one end of the exhaust hose (56). The other end of the exhaust hose (56) is connected to the exhaust chamber (12). The movable seat (51) above the blower fan (54) is connected to one end of the exhaust hose (57). The other end of the exhaust hose (57) is connected to the rectangular frame (71).

7. A low-voltage switchgear with good switching effect according to claim 6, characterized in that: Multiple infrared emitters (101) are installed on the outer wall of the cabinet (11) near the auxiliary heat dissipation box (41). The multiple infrared emitters (101) are respectively arranged in correspondence with the multiple auxiliary heat dissipation holes (17). An infrared receiver (55) is installed on the side of the movable seat (51) near the infrared emitter (101).

8. A low-voltage switchgear with good switching effect according to claim 5, characterized in that: The linkage structure includes a linkage shaft (81) rotatably connected to the bottom wall of the air extraction box (13). Both the linkage shaft (81) and the top of the rotating shaft (42) are fixedly connected to pulleys (82). The two pulleys (82) are connected by a belt ring (83). One of the transmission shafts (73) and the middle section of the linkage shaft (81) are fixedly fitted with bevel gears (84). The two bevel gears (84) mesh with each other.

9. A low-voltage switchgear with good switching effect according to claim 1, characterized in that: A dust baffle (91) is provided on the inner side of the filter screen (14), and the end of the dust baffle (91) is fixed to the inner wall of the air extraction box (13).

10. A low-voltage switchgear with good switching effect according to claim 9, characterized in that: The dust baffle (91) has a square hole (92) in the middle section. A metal spring (93) is fixedly connected to the output end of the second motor (44) and is aligned with the square hole (92). The length of the metal spring (93) is greater than the distance between the output end of the second motor (44) and the filter screen (14). A dust discharge hole (94) is provided on the side wall of the air extraction box (13) below the filter screen (14).

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