Ventilation device of high-low voltage power distribution cabinet and high-low voltage power distribution cabinet

Abstract

The invention discloses a ventilation device of a high-low voltage power distribution cabinet and the high-low voltage power distribution cabinet, and relates to the technical field of electrical equipment.The ventilation device structurally comprises a cabinet body, a ventilation mechanism is arranged in the cabinet body, the ventilation mechanism comprises a U-shaped shell, a lifting mechanism is arranged between the U-shaped shell and the cabinet body, and a sealing mechanism is arranged at the bottom of the U-shaped shell; fire extinguishing mechanisms are arranged on the front face and the back face of the U-shaped shell, fans are fixedly installed on the two sides in the U-shaped shell, and a first ventilation opening is formed in the inner side of the U-shaped shell. According to the ventilation device of the high-low voltage power distribution cabinet and the high-low voltage power distribution cabinet, the ventilation device is prevented from promoting fire spreading, wind can be blocked in time when a fire occurs, external oxygen can be prevented from entering the cabinet body in time, and the fire extinguishing mechanism is used for extinguishing fire; and when a fire disaster occurs, synchronous treatment of blocking and fire extinguishing is achieved, and time is provided for firefighters.

Description

Technical Field

[0001] The present invention relates to the field of electrical equipment, in particular to a ventilation device for a high- and low-voltage distribution cabinet and the high- and low-voltage distribution cabinet. Background Art

[0002] As the name implies, high and low voltage distribution cabinets are power distribution equipment used for power distribution, control, metering, and cable connection in power supply systems. Generally, power supply bureaus and substations use high-voltage switchgear, which is then stepped down by a transformer and led to the low-voltage side of the low-voltage distribution cabinet. The low-voltage distribution cabinet then leads to the distribution boards, control boxes, and switch boxes of various power users. These cabinets contain a number of switches, circuit breakers, fuses, buttons, indicator lights, meters, wires, and other protective devices assembled into one unit to meet the design functional requirements. High and low voltage distribution cabinets contain many electrical components. During use, these components continuously generate heat, and poor ventilation makes it impossible to remove the heat. The temperature inside the cabinet continues to rise, affecting the insulation of the electrical components. Furthermore, in rainy and snowy weather, the high humidity in the air can easily damage the electrical components, which in turn can easily cause malfunctions and render the high and low voltage distribution cabinets inoperable. Therefore, ventilation devices are necessary.

[0003] The existing ventilation devices and high and low voltage distribution cabinets of high and low voltage distribution cabinets have the problem that the operation of various electronic components inside the cabinet causes the temperature inside the cabinet to be too high, and the electrical components are easily overloaded, so that fire inside the cabinet due to short circuit is inevitable. In addition, when a fire occurs, it is difficult to ensure that the ventilation device stops working, so that the ventilation device blows more oxygen to help spread the fire. Even when the ventilation device stops working, outside air will continue to enter the cabinet. There is no fire extinguishing mechanism, so the cabinet continues to burn and the fire cannot be controlled in time. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In response to the deficiencies in the prior art, the present invention provides a ventilation device for a high and low voltage distribution cabinet and a high and low voltage distribution cabinet, which solves the problem that the operation of various electronic components inside the cabinet causes the temperature inside the cabinet to be too high, the electrical components are easily overloaded, and thus a fire inside the cabinet due to a short circuit is inevitable. In addition, when a fire occurs, it is difficult to ensure that the ventilation device stops working, so that the ventilation device blows more oxygen to help spread the fire. Even when the ventilation device stops working, outside air will continue to enter the cabinet, and there is no fire extinguishing mechanism, so the cabinet continues to burn and the fire cannot be controlled in time.

[0006] (2) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a ventilation device for a high and low voltage distribution cabinet and a high and low voltage distribution cabinet, comprising a cabinet body, a ventilation mechanism is provided inside the cabinet body, the ventilation mechanism comprises a U-shaped shell, a lifting mechanism is provided between the U-shaped shell and the cabinet body, a closing mechanism is provided at the bottom of the U-shaped shell, a fire extinguishing mechanism is provided at the front and back of the U-shaped shell, fans are fixedly installed on both sides of the interior of the U-shaped shell, a first ventilation port is provided on the inner side of the U-shaped shell, baffles are fixedly connected on both sides of the interior of the cabinet body, a second ventilation port is provided on the surface of the baffle, through holes are provided on both sides of the top of the U-shaped shell, and one side of the top of the cabinet body An air inlet is provided, and an exhaust port is provided at the bottom of the cabinet. A dust screen is fixedly connected to the inside of the air inlet and the inside of the exhaust port. A PLC controller is fixedly connected to the inner side of the cabinet, an audible and visual alarm is fixedly connected to the top side of the cabinet, and a smoke sensor is fixedly connected to the bottom side of the U-shaped shell. The fan is started by the controller to work, and the wind blown out by the fan passes through both sides of the interior of the ventilation shell. The baffle and the ventilation shell are tightly attached to each other, and at this time, the first ventilation port and the second ventilation port overlap with each other, so that the blown wind enters the interior of the cabinet through the first ventilation port and the second ventilation port, and then is discharged from the cabinet through the exhaust port, thereby achieving the purpose of ventilation.

[0008] Preferably, the ventilation mechanism further comprises a support block, wherein the support block is fixedly connected to the top of the baffle, and a guide plate is fixedly connected to one side of the baffle, and the guide plate is located on the top side of the second vent.

[0009] Preferably, inclined plates are fixedly connected to both sides of the interior of the U-shaped shell, and wind guide strips are fixedly connected to the surface of the inclined plates. The bottom ends of the inclined plates gradually approach each other, and the wind speed in the ventilation shell is changed by the inclined plates to avoid low wind speed when the distance from the fan is far, thereby improving the ventilation effect.

[0010] Preferably, the lifting mechanism includes a motor, which is fixedly installed on the top of the cabinet. The bottom end of the motor passes through the top wall of the cabinet and is fixedly connected to a threaded rod. The bottom end of the threaded rod passes through the top wall of the U-shaped shell and is fixedly connected to a limiting block. The surface of the U-shaped shell is fixedly connected to a threaded sleeve, and the threaded rod is threadedly connected to the inside of the threaded sleeve.

[0011] Preferably, the lifting mechanism also includes a limit plate, which is fixedly connected to the inner wall of the cabinet and slidably connected to the front and back of the U-shaped shell. The ventilation shell can be lifted and lowered by the lifting mechanism, and the first vent on the surface of the ventilation shell and the second vent on the baffle are overlapped or staggered, thereby achieving the purpose of controlling whether the wind blown out by the fan can be blown into the cabinet, that is, when ventilation is needed, the first vent and the second vent are overlapped, and the wind can enter the interior of the cabinet, otherwise the first vent and the second vent are staggered with each other, so that the wind cannot be blown vertically to the cabinet, thereby avoiding the wind contributing to the spread of fire.

[0012] Preferably, the closing mechanism includes a sealing plate, which is located at the bottom of the exhaust port, and L-shaped rods are fixedly connected to both sides of the top of the sealing plate. A movable opening is opened on the surface of the baffle, and the top of the L-shaped rod passes through the bottom wall and the movable opening of the cabinet and is fixedly connected to the surface of the U-shaped shell. A first sealing ring is fixedly connected to the top of the sealing plate, and the exhaust port can be blocked by the closing mechanism, and the air inlet is blocked by the ventilation shell and the through hole is blocked by the cabinet, so that a closed space is formed inside the cabinet, and oxygen in the outside air will not enter the interior of the cabinet, thereby achieving the purpose of isolating oxygen.

[0013] Preferably, the fire extinguishing mechanism includes a steel cylinder, which is fixedly connected to the surface of the U-shaped shell, a sleeve is fixedly connected to the inner bottom side of the steel cylinder, a nozzle is fixedly connected to the bottom of the steel cylinder, the bottom of the sleeve and the nozzle penetrate each other, and the interior of the steel cylinder is filled with carbon dioxide.

[0014] Preferably, a hollow rod is slidably connected to the interior of the sleeve, the top of the hollow rod passes through the inner wall of the cylinder and is fixedly connected to the inner wall of the cabinet, and a small hole is provided at the bottom of the hollow rod. The fire extinguishing mechanism can be used to extinguish the fire inside the cabinet that has caught fire, and the fire inside the cabinet can be further extinguished by isolating oxygen, thereby improving the speed of fire extinguishing and being able to control the fire inside the cabinet in a timely manner.

[0015] Preferably, a second sealing ring is provided between the hollow rod and the surface of the steel cylinder. The second sealing ring is fixedly connected to the surface of the steel cylinder and is slidingly connected to the hollow rod. The second sealing ring is used to seal the steel cylinder and the hollow rod.

[0016] (3) Beneficial effects

[0017] The present invention provides a ventilation device for a high- and low-voltage power distribution cabinet and a high- and low-voltage power distribution cabinet. The invention has the following beneficial effects:

[0018] (1) The ventilation device of the high and low voltage distribution cabinet and the high and low voltage distribution cabinet use the overlap between the first ventilation port and the second ventilation port to control whether the wind blown by the fan can be vertically directed into the cabinet body. When a fire occurs inside the cabinet body, the wind cannot enter the cabinet body, thereby preventing the spread of the fire. When the cabinet body is working normally, the wind blown by the fan can ventilate the interior of the cabinet body normally, thereby being able to control the ventilation state in the cabinet body according to actual conditions, making the device more flexible and changeable when used.

[0019] (2) The ventilation device of the high and low voltage distribution cabinet and the high and low voltage distribution cabinet, when a fire occurs inside the cabinet and the ventilation shell moves upward, the ventilation shell can block the air inlet, and the through hole is blocked by the cabinet, and at the same time the sealing mechanism blocks the exhaust port, thereby preventing the outside air from entering the interior of the cabinet, that is, isolating the oxygen from entering the cabinet. The combustion in the cabinet will consume the remaining oxygen inside, so that an oxygen-deficient space is formed inside the cabinet to isolate oxygen, thereby slowing down the spread of the fire.

[0020] (3) The ventilation device and the high and low voltage distribution cabinet of the high and low voltage distribution cabinet are such that when a fire occurs inside the cabinet, the carbon dioxide in the cylinder enters the hollow rod through the small hole and is then sprayed toward the fire source inside the cabinet through the nozzle, thereby achieving the purpose of extinguishing the fire. As a result, the fire can be extinguished at the first moment the cabinet is on fire. Moreover, the carbon dioxide in the cylinder is in liquid form. When the carbon dioxide is put into the cylinder, the pressure is relatively high and it is in liquid form. When the carbon dioxide is released into the air through the nozzle, the pressure becomes lower and it becomes gaseous. According to the principle of heat absorption by vaporization, the carbon dioxide absorbs the surrounding heat in the cabinet, lowers the temperature of the combustible material and its surroundings, and reduces the possibility of the combustible material being burned.

[0021] (IV) The ventilation device of the high and low voltage distribution cabinet and the high and low voltage distribution cabinet can gradually reduce the air outlet inside the ventilation shell by arranging an inclined plate inside the ventilation shell, thereby increasing the wind speed on the bottom side of the ventilation shell, and the ventilation effect will not be poor due to the increasing distance from the fan. The wind can be directed to both sides of the ventilation shell by using the wind guide strips, thereby avoiding the disorder of wind direction and improving the ventilation effect.

[0022] (5) The ventilation device of the high and low voltage distribution cabinet and the high and low voltage distribution cabinet utilize the first sealing ring to improve the sealing between the sealing plate and the exhaust port. The second sealing ring can prevent the carbon dioxide in the cylinder from flowing out through the gap between the hollow rod and the cylinder, thereby ensuring the sealing of the cylinder when in use. The first sealing ring and the second sealing ring improve the sealing of the entire cabinet, making the device more stable when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of the present invention as a whole;

[0024] Figure 2 It is a schematic diagram of the overall internal structure of the present invention;

[0025] Figure 3 Schematic diagram of the structure of the air inlet and exhaust port of the present invention;

[0026] Figure 4 It is a front cross-sectional view of the ventilation mechanism of the present invention;

[0027] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle;

[0028] Figure 6 This is a schematic structural diagram of the top of the U-shaped shell of the present invention;

[0029] Figure 7 This is a schematic structural diagram of the side surface of the inclined plate of the present invention;

[0030] Figure 8 It is a structural schematic diagram of the lifting mechanism of the present invention;

[0031] Figure 9 It is a structural schematic diagram of the closing mechanism of the present invention;

[0032] Figure 10 It is a structural schematic diagram of the fire extinguishing mechanism of the present invention.

[0033] In the figure: 1. cabinet; 2. ventilation mechanism; 21. U-shaped shell; 22. lifting mechanism; 221. motor; 222. threaded rod; 223. limit block; 224. threaded sleeve; 225. limit plate; 23. closing mechanism; 231. sealing plate; 232. L-shaped rod; 233. moving port; 234. first sealing ring; 24. fire extinguishing mechanism; 241. cylinder; 242. sleeve; 243. nozzle; 244. hollow rod; 245. small hole; 246. second sealing ring; 25. fan; 26. first ventilation port; 27. baffle; 28. second ventilation port; 29. ​​through hole; 210. support block; 211. guide plate; 212. inclined plate; 213. air guide strip; 3. air inlet; 4. exhaust port; 5. dust screen; 6. PLC controller; 7. sound and light alarm; 8. smoke sensor. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] See Figure 1-10The present invention provides a technical solution: a ventilation device for a high and low voltage distribution cabinet and a high and low voltage distribution cabinet, comprising a cabinet body 1, a ventilation mechanism 2 is provided inside the cabinet body 1, the ventilation mechanism 2 comprises a U-shaped shell 21, a lifting mechanism 22 is provided between the U-shaped shell 21 and the cabinet body 1, a closing mechanism 23 is provided at the bottom of the U-shaped shell 21, a fire extinguishing mechanism 24 is provided on the front and back of the U-shaped shell 21, fans 25 are fixedly installed on both sides of the interior of the U-shaped shell 21, a first ventilation opening 26 is provided on the inner side of the U-shaped shell 21, baffles 27 are fixedly connected to both sides of the interior of the cabinet body 1, a second ventilation opening 28 is provided on the surface of the baffle 27, through holes 29 are provided on both sides of the top of the U-shaped shell 21, and an air inlet 3 is provided on one side of the top of the cabinet body 1. An exhaust port 4 is provided at the bottom of the cabinet 1, and a dustproof net 5 is fixedly connected to the inside of the air inlet 3 and the inside of the exhaust port 4. A PLC controller 6 is fixedly connected to the inner side of the cabinet 1, and an audible and visual alarm 7 is fixedly connected to the top side of the cabinet 1. A smoke sensor 8 is fixedly connected to the bottom side of the U-shaped shell 21. The fan 25 is started by the controller to work, and the wind blown out by the fan 25 passes through the inner sides of the ventilation shell, and the baffle 27 is tightly attached to the ventilation shell. At this time, the first ventilation port 26 and the second ventilation port 28 overlap with each other, so that the blown wind enters the interior of the cabinet 1 through the first ventilation port 26 and the second ventilation port 28, and then is discharged from the cabinet 1 through the exhaust port 4, thereby achieving the purpose of ventilation.

[0036] The ventilation mechanism 2 further includes a support block 210 , which is fixedly connected to the top of the baffle 27 . A guide plate 211 is fixedly connected to one side of the baffle 27 , and the guide plate 211 is located on the top side of the second ventilation opening 28 .

[0037] Specifically, the support block 210 can support the ventilation shell, and the guide plate 211 can make the wind blow out along the direction of the guide plate 211, so that the wind inside the cabinet 1 can be blown out in the direction of the exhaust port 4, achieving a better ventilation effect.

[0038] The U-shaped shell 21 has two sides internally fixedly connected with inclined plates 212 , and the surface of the inclined plates 212 has air guide strips 213 fixedly connected thereto, with the bottom ends of the inclined plates 212 gradually approaching each other.

[0039] Specifically, when the ventilation volume of the fan 25 is constant and the volume of the ventilation duct is constant, the small air outlet is equivalent to suddenly reducing the capacity at the air outlet, the pressure will increase, and the wind speed will also increase relatively. Due to the arrangement of the inclined plates 212 on both sides of the ventilation shell, the air outlet inside the ventilation shell gradually becomes smaller, thereby increasing the wind speed on the bottom side of the ventilation shell. The ventilation effect will not be poor due to the increasing distance from the fan 25. The wind guide strips 213 can be used to direct the wind to both sides of the ventilation shell, avoiding the disorder of the wind direction and the poor ventilation effect.

[0040] Among them, the lifting mechanism 22 includes a motor 221, which is fixedly installed on the top of the cabinet 1. The bottom end of the motor 221 passes through the top wall of the cabinet 1 and is fixedly connected to a threaded rod 222. The bottom end of the threaded rod 222 passes through the top wall of the U-shaped shell 21 and is fixedly connected to a limiting block 223. The surface of the U-shaped shell 21 is fixedly connected to a threaded sleeve 224, and the threaded rod 222 is threadedly connected to the inside of the threaded sleeve 224.

[0041] The lifting mechanism 22 further includes a limiting plate 225 , which is fixedly connected to the inner wall of the cabinet 1 and slidably connected to the front and back sides of the U-shaped shell 21 .

[0042] Among them, the closing mechanism 23 includes a sealing plate 231, which is located at the bottom of the exhaust port 4. L-shaped rods 232 are fixedly connected to both sides of the top of the sealing plate 231. A movable opening 233 is opened on the surface of the baffle 27. The top of the L-shaped rod 232 passes through the bottom wall of the cabinet 1 and the movable opening 233 and is fixedly connected to the surface of the U-shaped shell 21. The top of the sealing plate 231 is fixedly connected to a first sealing ring 234.

[0043] Among them, the fire extinguishing mechanism 24 includes a cylinder 241, which is fixedly connected to the surface of the U-shaped shell 21. The inner bottom side of the cylinder 241 is fixedly connected with a sleeve 242, and the bottom of the cylinder 241 is fixedly connected with a nozzle 243. The bottom of the sleeve 242 and the nozzle 243 penetrate each other, and the interior of the cylinder 241 is filled with carbon dioxide.

[0044] The sleeve 242 is internally slidably connected to a hollow rod 244 , the top end of the hollow rod 244 passes through the inner wall of the cylinder 241 and is fixedly connected to the inner wall of the cabinet 1 , and a small hole 245 is formed at the bottom of the hollow rod 244 .

[0045] A second sealing ring 246 is provided between the hollow rod 244 and the surface of the steel cylinder 241 . The second sealing ring 246 is fixedly connected to the surface of the steel cylinder 241 , and the second sealing ring 246 and the hollow rod 244 are slidably connected.

[0046] Specifically, when the hollow rod 244 moves up and down in the cylinder 241, the second sealing ring 246 can prevent the carbon dioxide in the cylinder 241 from flowing out through the gap between the hollow rod 244 and the cylinder 241, thereby ensuring the sealing of the cylinder 241 during use.

[0047] During operation, when the cabinet 1 is ventilated normally, the ventilation mechanism 2 is used to ventilate the interior of the cabinet 1. Specifically, external air enters the interior of the cabinet 1 through the air inlet 3, and then the air enters the interior of the ventilation shell through the through-hole 29. The fan 25 is started by the controller to work, and the wind blown by the fan 25 flows through both sides of the interior of the ventilation shell. The baffle 27 and the ventilation shell are in close contact with each other, and at this time, the first ventilation port 26 and the second ventilation port 28 overlap with each other, so that the blown wind enters the interior of the cabinet 1 through the first ventilation port 26 and the second ventilation port 28, and then is discharged from the cabinet 1 through the exhaust port 4, thereby achieving the purpose of ventilation. The dustproof net 5 can prevent dust in the air from entering the interior of the cabinet 1 through the air inlet 3 or the exhaust port 4, thereby preventing dust from damaging the internal components of the cabinet 1 and extending the service life of the cabinet 1;

[0048] When a fire is detected inside the cabinet 1, the controller immediately starts the motor 221, and the motor 221 drives the threaded rod 222 to rotate. Due to the restriction of the limit plate 225, the ventilation shell can only move up and down, so that the cooperation between the threaded rod 222 and the threaded sleeve 224 causes the ventilation shell to move upward until the top of the ventilation shell abuts against the surface of the cabinet 1. At this time, the first ventilation port 26 and the second ventilation port 28 are staggered with each other, so that the air inside the ventilation shell cannot be blown to the inside of the cabinet 1, thereby preventing the wind from fueling the spread of the fire. When the ventilation shell moves upward, the air inlet 3 is abutted and closed by the ventilation shell, and the through hole 29 is blocked by the cabinet 1. The air outside the cabinet 1 can no longer enter the cabinet 1 through the air inlet 3. At the same time, the closing mechanism 23 moves upward and seals the exhaust port 4. At this time, the cabinet 1 is in a closed state, and the outside oxygen cannot enter the interior of the cabinet 1. When the oxygen inside the cabinet 1 is consumed, the cabinet 1 is in an oxygen-deficient state, which is conducive to fire extinguishing.

[0049] The ventilation shell and the sealing plate 231 are connected by an L-shaped plate, so that when the ventilation shell moves upward, the sealing plate 231 moves upward until the sealing plate 231 blocks the exhaust port 4. The first sealing ring 234 is provided to improve the sealing between the sealing plate 231 and the exhaust port 4, thereby preventing external oxygen from entering the interior of the cabinet 1 through the exhaust port 4.

[0050] When the ventilation shell moves to the uppermost position in the cabinet 1, the fire inside the cabinet 1 is extinguished by the fire extinguishing mechanism 24. Specifically, the upward movement of the ventilation shell drives the hollow rod 244 to move upward until the position of the small hole 245 moves to the top of the sleeve 242, so that the carbon dioxide in the cylinder 241 enters the interior of the hollow rod 244 through the small hole 245 on the side, and then enters the nozzle 243 through the small hole 245 at the bottom. The carbon dioxide is sprayed into the interior of the cabinet 1 through the nozzle 243, thereby achieving the effect of extinguishing the fire. The carbon dioxide in the cylinder 241 is liquid. When the carbon dioxide is filled into the cylinder 241, the pressure is high and it is in liquid state. When it is released into the air through the nozzle 243, the pressure becomes lower and it becomes gaseous. According to the principle of vaporization heat absorption, it absorbs the surrounding heat in the cabinet 1 and reduces the temperature of the combustibles and the surrounding temperatures. When the carbon dioxide gas is ejected due to isolation from the air, a large amount of carbon dioxide accumulates at the location of the fire, so that the oxygen around the combustibles is isolated, thereby achieving the purpose of extinguishing the fire.

[0051] The motor 221, fan 25, sound and light alarm 7 and smoke sensor 8 are all electrically connected to the external power supply through the controller. The smoke sensor 8 with model number YJ-115 is used to monitor whether a fire occurs inside the cabinet 1. When the smoke sensor 8 detects smoke, it sends a signal to the PLC controller 6. At the same time, the PLC controller 6 controls the sound and light alarm 7 with model number YD-D3A to sound an alarm, thereby reminding the staff to come and check the situation in time, reducing the possibility of the spread of the fire. The normal operation of the motor 221 and the fan 25 is controlled by the PLC controller 6.

[0052] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0053] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A ventilation device for a high and low voltage distribution cabinet and a high and low voltage distribution cabinet, comprising a cabinet body (1), characterized in that: A ventilation mechanism (2) is arranged inside the cabinet (1), and the ventilation mechanism (2) comprises a U-shaped shell (21), a lifting mechanism (22) is arranged between the U-shaped shell (21) and the cabinet (1), a sealing mechanism (23) is arranged at the bottom of the U-shaped shell (21), a fire extinguishing mechanism (24) is arranged at the front and back of the U-shaped shell (21), fans (25) are fixedly installed on both sides of the interior of the U-shaped shell (21), a first ventilation opening (26) is opened on the inner side of the U-shaped shell (21), baffles (27) are fixedly connected to both sides of the interior of the cabinet (1), and the baffles (27) are fixedly connected to the cabinet (1). A second ventilation opening (28) is provided on the surface of the plate (27), through holes (29) are provided on both sides of the top of the U-shaped shell (21), an air inlet (3) is provided on one side of the top of the cabinet (1), an exhaust port (4) is provided on the bottom of the cabinet (1), a dustproof net (5) is fixedly connected to the inside of the air inlet (3) and the inside of the exhaust port (4), a PLC controller (6) is fixedly connected to one side of the inside of the cabinet (1), an audible and visual alarm (7) is fixedly connected to one side of the top of the cabinet (1), and a smoke sensor (8) is fixedly connected to one side of the bottom of the U-shaped shell (21).

2. The ventilation device for high and low voltage distribution cabinet and the high and low voltage distribution cabinet according to claim 1, characterized in that: The ventilation mechanism (2) further comprises a support block (210), wherein the support block (210) is fixedly connected to the top of the baffle (27), and a guide plate (211) is fixedly connected to one side of the baffle (27), wherein the guide plate (211) is located on the top side of the second ventilation opening (28).

3. The ventilation device for high and low voltage distribution cabinet and the high and low voltage distribution cabinet according to claim 2, characterized in that: Inclined plates (212) are fixedly connected to both sides of the interior of the U-shaped shell (21), and wind guide strips (213) are fixedly connected to the surface of the inclined plates (212), and the bottom ends of the inclined plates (212) gradually approach each other.

4. The ventilation device for high and low voltage distribution cabinet and the high and low voltage distribution cabinet according to claim 1, characterized in that: The lifting mechanism (22) comprises a motor (221), the motor (221) is fixedly mounted on the top of the cabinet (1), the bottom end of the motor (221) passes through the top wall of the cabinet (1) and is fixedly connected to a threaded rod (222), the bottom end of the threaded rod (222) passes through the top wall of the U-shaped shell (21) and is fixedly connected to a limit block (223), the surface of the U-shaped shell (21) is fixedly connected to a threaded sleeve (224), and the threaded rod (222) is threadedly connected to the inside of the threaded sleeve (224).

5. The ventilation device for high and low voltage distribution cabinet and the high and low voltage distribution cabinet according to claim 1, characterized in that: The lifting mechanism (22) further comprises a limit plate (225), wherein the limit plate (225) is fixedly connected to the inner wall of the cabinet (1), and the limit plate (225) is slidably connected to the front and back sides of the U-shaped shell (21).

6. The ventilation device for high and low voltage distribution cabinet and the high and low voltage distribution cabinet according to claim 1, characterized in that: The sealing mechanism (23) comprises a sealing plate (231), the sealing plate (231) being located at the bottom of the exhaust port (4), L-shaped rods (232) being fixedly connected to both sides of the top of the sealing plate (231), a movable opening (233) being provided on the surface of the baffle (27), the top end of the L-shaped rod (232) passing through the bottom wall of the cabinet (1) and the movable opening (233) and being fixedly connected to the surface of the U-shaped shell (21), and a first sealing ring (234) being fixedly connected to the top of the sealing plate (231).

7. The ventilation device for high and low voltage distribution cabinet and the high and low voltage distribution cabinet according to claim 1, characterized in that: The fire extinguishing mechanism (24) comprises a steel cylinder (241), the steel cylinder (241) is fixedly connected to the surface of the U-shaped shell (21), a sleeve (242) is fixedly connected to the inner bottom side of the steel cylinder (241), a nozzle (243) is fixedly connected to the bottom of the steel cylinder (241), the bottom of the sleeve (242) and the nozzle (243) penetrate each other, and the interior of the steel cylinder (241) is filled with carbon dioxide.

8. The ventilation device for high and low voltage distribution cabinet and the high and low voltage distribution cabinet according to claim 7, characterized in that: A hollow rod (244) is slidably connected inside the sleeve (242), the top end of the hollow rod (244) passes through the inner wall of the cylinder (241) and is fixedly connected to the inner wall of the cabinet (1), and a small hole (245) is formed at the bottom of the hollow rod (244).

9. The ventilation device for high and low voltage distribution cabinet and the high and low voltage distribution cabinet according to claim 8, characterized in that: A second sealing ring (246) is provided between the hollow rod (244) and the surface of the steel cylinder (241); the second sealing ring (246) is fixedly connected to the surface of the steel cylinder (241); and the second sealing ring (246) and the hollow rod (244) are slidably connected.

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