CN112234456A

CN112234456A - Prevent flooding liftable switch board

Info

Publication number: CN112234456A
Application number: CN202011123784.9A
Authority: CN
Inventors: 陈匹
Original assignee: Shaoxing Tuya Electronic Technology Co ltd
Current assignee: Shaoxing Tuya Electronic Technology Co ltd
Priority date: 2020-10-20
Filing date: 2020-10-20
Publication date: 2021-01-15

Abstract

The invention relates to the related field of power distribution cabinets, in particular to a submergence-preventing liftable power distribution cabinet, which comprises a cabinet body and a placing cavity arranged in a telescopic cabinet body, wherein power distribution equipment positioned in the placing cavity is fixedly arranged on the bottom wall of the placing cavity, a ventilation device is arranged in the placing cavity, the ventilation device is used for cooling the power distribution equipment, and the ventilation device can also provide an inflation function in an emergency; the lifting mechanisms are symmetrically arranged on the front side and the rear side of the placing cavity in the cabinet body, the height of the cabinet body of the power distribution cabinet can be changed according to the height of surface water, so that water is prevented from entering the power distribution cabinet, when the water level is too high, the cabinet body can be floated through the self-provided buoyancy device, the water flooding is avoided, the water-proof effect of the equipment is good, and the normal use of the power distribution cabinet is effectively guaranteed.

Description

Prevent flooding liftable switch board

Technical Field

The invention relates to the related field of power distribution cabinets, in particular to a submergence-preventing liftable power distribution cabinet.

Background

The power is used as an indispensable energy source in our life, the power distribution cabinet is an important junction in the power transmission process, the conventional power distribution cabinets are fixed on the ground, when disasters such as flood and the like occur, the power distribution cabinet is easy to cause faults due to short circuit, not only is equipment lost, but also the safety of a power grid is possibly affected, and therefore, a submergence-preventing liftable power distribution cabinet is necessary to be designed, and the existing problems are solved.

Disclosure of Invention

The invention aims to provide a submergence-preventing liftable power distribution cabinet, which can overcome the defects in the prior art, so that the practicability of equipment is improved.

The technical scheme adopted by the invention for solving the technical problems is as follows: the invention discloses a submergence-preventing liftable power distribution cabinet, which comprises a cabinet body and a placing cavity arranged in the telescopic cabinet body, wherein power distribution equipment positioned in the placing cavity is fixedly arranged on the bottom wall of the placing cavity, a ventilation device is arranged in the placing cavity and used for cooling the power distribution equipment, and the ventilation device can also provide an inflation function in an emergency; the lifting mechanism is arranged in the cabinet body and is positioned in front of and behind the placing cavity, the lifting mechanism at the front side comprises a first transmission cavity which is arranged in the cabinet body in a bilateral symmetry manner and is positioned at the front side of the placing cavity, a second transmission cavity which is positioned at the lower side of the first transmission cavity is arranged in the cabinet body, a lifting shaft which penetrates through the second transmission cavity and extends to the bottom of the cabinet body is arranged on the bottom wall of the first transmission cavity in a sliding manner, a base which is positioned at the bottom of the cabinet body is fixedly arranged at the bottom end of the lifting shaft, a rotary drum which is sleeved on the lifting shaft and is matched and connected with the lifting shaft is arranged on the bottom wall of the second transmission cavity in a rotating manner, the lifting shaft is driven to move up and down when the rotary drum rotates, a road which is positioned in the second transmission cavity is fixedly arranged on the outer, the two symmetrical rotary drums on the left and the right are kept to move synchronously, a first bevel gear which is positioned in the second transmission cavity is fixedly arranged at the top end of the rotary drum, a connecting groove which extends downwards and is positioned in the first transmission cavity is arranged at the top end of the lifting shaft, a connecting shaft is slidably arranged in the connecting groove, a clamping block which can be matched with the inner wall of the connecting groove is arranged on the side wall of the connecting shaft in a spring connection mode, the clamping block can clamp the inner wall of the connecting groove to prevent the connecting shaft from being separated from the lifting shaft, a spring rod is slidably arranged at the top end of the connecting shaft, a spring plate which is connected with the connecting shaft through a spring is fixedly arranged at the top end of the spring rod, the bottom end of the spring rod is connected with the inner wall of the clamping block through a pull wire, and when the, so that the connecting shaft is separated from the lifting shaft, and the lifting mechanism on the rear side and the lifting mechanism on the front side are completely symmetrical and keep synchronous motion; the cabinet is characterized in that a transmission mechanism is arranged inside the cabinet and positioned on the lower side of the placing cavity, and the transmission mechanism is used for transmitting power to the ventilation device and the lifting mechanism.

Furthermore, the lifting mechanism also comprises fixed blocks which are fixedly arranged on the inner wall of the first transmission cavity in bilateral symmetry and are positioned on the lower side of the spring plate, first piston cavities which are symmetrically arranged at the left side and the right side of the first transmission cavity and are arranged at the lower side of the fixed block are arranged in the cabinet body, a first piston rod extending into the first transmission cavity and abutting against the lifting shaft is arranged in the first piston cavity in a sliding manner, the first piston rod is connected with the first piston cavity through a spring, the lifting shaft moves downwards until the spring plate is contacted with the fixed block, the spring plate is forced to pull the spring rod, so that the connecting shaft is separated from the lifting shaft, and the lifting shaft continuously moves downwards until the first piston rod is not contacted with the lifting shaft any more, and the first piston rod slides towards the first transmission cavity under the action of the spring.

Furthermore, the ventilation device comprises a placing cavity and an air inlet which is arranged on the right end wall of the placing cavity and extends backwards to the outside of the cabinet body, a third transmission cavity which is positioned on the lower side of the floating block is arranged in the cabinet body, a fan wheel shaft which extends into the placing cavity is rotatably arranged on the rear end wall of the third transmission cavity, a first belt wheel which is positioned in the third transmission cavity is fixedly arranged on the outer surface of the fan wheel shaft, a fan wheel which is positioned in the placing cavity is fixedly arranged on the left end of the fan wheel shaft, the ventilation device further comprises air holes which are arranged on the left end wall of the placing cavity in an array mode, the air holes are communicated with the outside, a sliding groove which penetrates through the air holes is arranged in the cabinet body, a partition plate is arranged in the sliding mode, through holes which can be communicated with the air holes are arranged in the partition plate, and the partition plate can, the air hole is not ventilated any more, a second piston cavity positioned on the lower side of the sliding groove is arranged in the cabinet body, the second piston cavity is communicated with the first piston cavity through an air pipe, a second piston rod extending into the sliding groove and contacting with the partition plate is arranged in the second piston cavity in a sliding mode, and when the first piston rod slides in the first transmission cavity, the second piston rod moves downwards, so that the partition plate moves downwards, and the air hole is blocked; ventilation unit still includes the bilateral symmetry setting and is in the inflation chamber that cabinet body diapire upwards extends, the fixed buoyancy bag that is provided with in inflation chamber inside, the buoyancy bag with place the chamber diapire and pass through the gas tube intercommunication, work as the back is blocked up to the gas pocket, the fan wheel continues to rotate and passes through the gas tube to gas injection in the buoyancy bag makes the buoyancy bag inflation produces buoyancy.

Furthermore, the transmission mechanism comprises a motor which is arranged inside the cabinet body and positioned on the left side of the third transmission cavity, an output shaft of the motor extends rightwards into the third transmission cavity, a spline shaft which is positioned in the third transmission cavity is arranged on the outer surface of the output shaft in a spline fit manner, a second bevel gear which is positioned in the third transmission cavity is fixedly arranged on the outer surface of the spline shaft, a third bevel gear which is positioned in the third transmission cavity is fixedly arranged at the right end of the spline shaft, an air cylinder which is positioned on the upper side of the output shaft is arranged inside the cabinet body, a third piston rod which extends into the third transmission cavity and is contacted with the spline shaft is slidably arranged inside the air cylinder, a rotating shaft which extends into the second transmission cavity is symmetrically arranged on the front end wall and the rear end wall of the third transmission cavity, and a fourth bevel gear which can be meshed with the second bevel gear and the third bevel gear is fixedly arranged on the, a fifth bevel gear meshed with the first bevel gear is fixedly arranged on the end face of the rotating shaft in the second transmission cavity, and a second belt wheel which is positioned on the right side of the third bevel gear and is in fit connection with the first belt wheel through a second belt is fixedly arranged on the outer surface of the output shaft; the transmission mechanism is characterized by further comprising a buoyancy groove arranged on the bottom wall of the cabinet body and located between the inflation cavities, wherein spring connection in the buoyancy groove is provided with bilaterally symmetrical floating blocks, a fixed rod is fixedly arranged between the floating blocks, a controller which can be in contact with the fixed rod is fixedly arranged on the top wall of the buoyancy groove, and the controller controls movement of a third piston rod in the cylinder.

The invention has the beneficial effects that: the submergence-preventing liftable power distribution cabinet provided by the invention can change the height of the cabinet body of the power distribution cabinet according to the height of surface water, so that water is prevented from entering the power distribution cabinet, and when the water level is too high, the equipment can float the cabinet body through the self-provided buoyancy device to prevent water flooding.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic diagram of the overall structure of a submergence-preventing liftable power distribution cabinet.

Fig. 2 is a schematic view of the structure a-a in fig. 1.

Fig. 3 is a partially enlarged structural diagram of B in fig. 2.

Fig. 4 is a partially enlarged structural diagram of C in fig. 1.

Fig. 5 is a partially enlarged schematic view of D in fig. 1.

Detailed Description

The invention will now be described in detail with reference to fig. 1-5, wherein for ease of description the orientations described hereinafter are now defined as follows: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

The submergence-preventing liftable power distribution cabinet disclosed in the attached drawings 1 to 5 comprises a cabinet body 10 and a placing cavity 12 arranged inside the telescopic cabinet body 10, wherein a power distribution device 13 located in the placing cavity 12 is fixedly arranged on the bottom wall of the placing cavity 12, a ventilation device 71 is arranged inside the placing cavity 12, the ventilation device 71 is used for cooling the power distribution device 13, and the ventilation device 71 can also provide an inflation function in an emergency; the cabinet body 10 is internally provided with lifting mechanisms 72 which are positioned in front and back of the placing cavity 12 and are symmetrical, the front lifting mechanism 72 comprises a first transmission cavity 43 which is arranged in the cabinet body 10 in a bilateral symmetry manner and is positioned in front of the placing cavity 12, the cabinet body 10 is internally provided with a second transmission cavity 34 which is positioned at the lower side of the first transmission cavity 43, the bottom wall of the first transmission cavity 43 is slidably provided with a lifting shaft 37 which penetrates through the second transmission cavity 34 and extends to the bottom of the cabinet body 10, the bottom end of the lifting shaft 37 is fixedly provided with a base 25 which is positioned at the bottom of the cabinet body 10, the bottom wall of the second transmission cavity 34 is rotatably provided with a rotary drum 38 which is sleeved on the lifting shaft 37 and is matched and connected with the lifting shaft 37, the rotary drum 38 drives the lifting shaft 37 to move up and down when rotating, and the outer surface of the rotary drum 38 is fixedly provided with a, the left and right symmetrical roads 39 are connected by a first belt 40 in a matching manner, so that the left and right symmetrical drums 38 keep synchronous motion, the top end of the drum 38 is fixedly provided with a first bevel gear 35 positioned in the second transmission chamber 34, the top end of the lifting shaft 37 is provided with a connecting groove 50 extending downwards and positioned in the first transmission chamber 43, the inside of the connecting groove 50 is slidably provided with a connecting shaft 49, the side wall of the connecting shaft 49 is provided with a clamping block 51 in a spring connection manner, the inner wall of the connecting groove 50 can be clamped by the clamping block 51, so that the connecting shaft 49 cannot be separated from the lifting shaft 37, the top end of the connecting shaft 49 is slidably provided with a spring rod 48, the top end of the spring rod 48 is fixedly provided with a spring plate 47 connected with the connecting shaft 49 through a spring, and the bottom end of the spring rod 48 is connected with the inner wall of the clamping block, when the spring plate 47 is forced to pull the spring rod 48 upwards to move upwards, the spring rod 48 pulls the fixture block 51 to retract into the connection groove 50, so that the connection shaft 49 is separated from the lifting shaft 37, and the lifting mechanism 72 on the rear side is completely symmetrical to the lifting mechanism 72 on the front side and keeps synchronous movement; the cabinet 10 is provided with a transmission mechanism 73 located at the lower side of the placing cavity 12, and the transmission mechanism 73 transmits power to the ventilation device 71 and the lifting mechanism 72.

Advantageously, the lifting mechanism 72 further comprises a fixed block 44 which is fixedly disposed on the inner wall of the first transmission cavity 43 and is bilaterally symmetrical to each other and is located on the lower side of the spring plate 47, a first piston cavity 45 which is located on the left and right sides of the first transmission cavity 43 and is located on the lower side of the fixed block 44 is disposed inside the cabinet 10, a first piston rod 46 which extends into the first transmission cavity 43 and abuts against the lifting shaft 37 is slidably disposed inside the first piston cavity 45, the first piston rod 46 and the first piston cavity 45 are connected by a spring, the lifting shaft 37 moves down until the spring plate 47 contacts the fixed block 44, the spring plate 47 is forced to pull the spring rod 48, so that the connecting shaft 49 is separated from the lifting shaft 37, and the lifting shaft 37 moves down continuously until the first piston rod 46 is no longer in contact with the lifting shaft 37, the first piston rod 46 slides under the action of a spring into the first transmission chamber 43.

Advantageously, the ventilating device 71 includes a placing cavity 12 and an air inlet 33 disposed on the right end wall of the placing cavity 12 and extending backwards to the outside of the cabinet 10, a third transmission cavity 26 located on the lower side of the floating block 22 is disposed inside the cabinet 10, a fan wheel shaft 31 extending into the placing cavity 12 is rotatably disposed on the rear end wall of the third transmission cavity 26, a first pulley 30 located in the third transmission cavity 26 is fixedly disposed on the outer surface of the fan wheel shaft 31, a fan wheel 32 located in the placing cavity 12 is fixedly disposed on the left end of the fan wheel shaft 31, the ventilating device 71 further includes air holes 57 arranged in the left end wall of the placing cavity 12 in an array, the air holes 57 are communicated with the outside, a sliding slot 58 penetrating through the air holes 57 is disposed inside the cabinet 10, a partition 59 is slidably disposed inside the sliding slot 58, and a through hole 60 capable of being communicated with the air holes 57 is disposed inside the partition 59, when the partition 59 moves downwards, the through hole 60 and the air hole 57 are not aligned any more, so that the air hole 57 is not ventilated any more, a second piston cavity 15 located at the lower side of the sliding chute 58 is arranged inside the cabinet 10, the second piston cavity 15 is communicated with the first piston cavity 45 through an air pipe 17, a second piston rod 16 extending into the sliding chute 58 and contacting with the partition 59 is slidably arranged inside the second piston cavity 15, and when the first piston rod 46 slides into the first transmission cavity 43, the second piston rod 16 moves downwards, so that the partition 59 moves downwards, and the air hole 57 is blocked; the ventilation device 71 further comprises an inflation cavity 19 which is symmetrically arranged on the left and right sides and extends upwards from the bottom wall of the cabinet 10, a buoyancy bag 20 is fixedly arranged inside the inflation cavity 19, the buoyancy bag 20 is communicated with the bottom wall of the placing cavity 12 through an inflation tube 18, when the air hole 57 is blocked, the fan wheel 32 continuously rotates to inject air into the buoyancy bag 20 through the inflation tube 18, and the buoyancy bag 20 expands to generate buoyancy.

Advantageously, the transmission mechanism 73 includes an electric motor 11 disposed inside the cabinet 10 and located on the left side of the third transmission cavity 26, an output shaft 28 of the electric motor 11 extends rightward into the third transmission cavity 26, a spline shaft 54 located inside the third transmission cavity 26 is disposed on the outer surface of the output shaft 28 in a spline fit manner, a second bevel gear 55 located inside the third transmission cavity 26 is fixedly disposed on the outer surface of the spline shaft 54, a third bevel gear 56 located inside the third transmission cavity 26 is fixedly disposed on the right end of the spline shaft 54, an air cylinder 52 located on the upper side of the output shaft 28 is disposed inside the cabinet 10, a third piston rod 53 extending into the third transmission cavity 26 and contacting with the spline shaft 54 is slidably disposed inside the air cylinder 52, and the front and rear end walls of the third transmission cavity 26 are symmetrically provided with a rotating shaft 41 extending into the second transmission cavity 34, a fourth bevel gear 42 which can be meshed with the second bevel gear 55 and the third bevel gear 56 is fixedly arranged on the end surface of the rotating shaft 41 in the third transmission cavity 26, a fifth bevel gear 36 which is meshed with the first bevel gear 35 is fixedly arranged on the end surface of the rotating shaft 41 in the second transmission cavity 34, and a second belt wheel 27 which is positioned at the right side of the third bevel gear 56 and is in fit connection with the first belt wheel 30 through a second belt 29 is fixedly arranged on the outer surface of the output shaft 28; the transmission mechanism 73 further comprises a buoyancy groove 21 which is arranged on the bottom wall of the cabinet body 10 and located between the inflation cavities 19, the buoyancy groove 21 is internally provided with bilaterally symmetrical floating blocks 22 through spring connection, a fixing rod 23 is fixedly arranged between the floating blocks 22, the top wall of the buoyancy groove 21 is fixedly provided with a controller 24 which can be in contact with the fixing rod 23, and the controller 24 controls the third piston rod 53 in the cylinder 52 to move.

The fixing and connecting method in this embodiment includes, but is not limited to, bolting, welding, and the like.

Sequence of mechanical actions of the whole device:

in the initial state, the fourth bevel gear 42 is not engaged with the second bevel gear 55, the fourth bevel gear 42 is not engaged with the third bevel gear 56, the fixture block 51 blocks the inner wall of the connecting groove 50 so that the connecting shaft 49 cannot be separated from the lifting shaft 37, and the through hole 60 is aligned with the air hole 57 so that the air hole 57 can be ventilated.

When the device of the present invention is operated, the motor 11 is activated to rotate the output shaft 28, so as to rotate the second pulley 27, so as to rotate the first pulley 30, so as to rotate the fan 32, so that the fan 32 sucks air from the air inlet 33 to cool the power distribution device 13 and exhausts air from the air hole 57, when water is present at the bottom of the cabinet 10, the floating block 22 is floated to move up or down, so that the second bevel gear 55 or the third bevel gear 56 is engaged with the fourth bevel gear 42, so as to rotate the rotating shaft 41, so as to rotate the rotating drum 38, so as to move up or down the lifting shaft 37, so as to lift the cabinet 10 to avoid flooding, when the water level is too high, the cabinet 10 continues to lift until the spring plate 47 contacts the fixed block 44, after the spring plate 47 is forced to pull the spring rod 48, so that the connecting shaft 49 is separated from the lifting shaft 37, the lifting shaft 37 continues to move downwards until the first piston rod 46 is no longer in contact with the lifting shaft 37, the first piston rod 46 slides into the first transmission cavity 43 under the action of the spring, so that the second piston rod 16 moves downwards, so that the partition plate 59 moves downwards, so that the air hole 57 is blocked, after the air hole 57 is blocked, the fan wheel 32 continues to rotate, so that air is injected into the buoyancy bag 20 through the air filling tube 18, so that the buoyancy bag 20 expands to generate buoyancy, at this time, the lifting shaft 37 is separated from the cabinet body 10, and the cabinet body 10 floats on the water surface under the action of the buoyancy bag 20 to avoid flooding.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a prevent flooding liftable switch board, includes the cabinet body and sets up the chamber of placing in the internal portion of flexible cabinet, its characterized in that: the bottom wall of the placing cavity is fixedly provided with power distribution equipment positioned in the placing cavity, a ventilation device is arranged in the placing cavity and used for cooling the power distribution equipment, and the ventilation device can also provide an inflation function in an emergency; the lifting mechanism is arranged in the cabinet body and is positioned in front of and behind the placing cavity, the lifting mechanism at the front side comprises a first transmission cavity which is arranged in the cabinet body in a bilateral symmetry manner and is positioned at the front side of the placing cavity, a second transmission cavity which is positioned at the lower side of the first transmission cavity is arranged in the cabinet body, a lifting shaft which penetrates through the second transmission cavity and extends to the bottom of the cabinet body is arranged on the bottom wall of the first transmission cavity in a sliding manner, a base which is positioned at the bottom of the cabinet body is fixedly arranged at the bottom end of the lifting shaft, a rotary drum which is sleeved on the lifting shaft and is matched and connected with the lifting shaft is arranged on the bottom wall of the second transmission cavity in a rotating manner, the lifting shaft is driven to move up and down when the rotary drum rotates, a road which is positioned in the second transmission cavity is fixedly arranged on the outer, the two symmetrical rotary drums on the left and the right are kept to move synchronously, a first bevel gear which is positioned in the second transmission cavity is fixedly arranged at the top end of the rotary drum, a connecting groove which extends downwards and is positioned in the first transmission cavity is arranged at the top end of the lifting shaft, a connecting shaft is slidably arranged in the connecting groove, a clamping block which can be matched with the inner wall of the connecting groove is arranged on the side wall of the connecting shaft in a spring connection mode, the clamping block can clamp the inner wall of the connecting groove to prevent the connecting shaft from being separated from the lifting shaft, a spring rod is slidably arranged at the top end of the connecting shaft, a spring plate which is connected with the connecting shaft through a spring is fixedly arranged at the top end of the spring rod, the bottom end of the spring rod is connected with the inner wall of the clamping block through a pull wire, and when the, so that the connecting shaft is separated from the lifting shaft, and the lifting mechanism on the rear side and the lifting mechanism on the front side are completely symmetrical and keep synchronous motion; the cabinet is characterized in that a transmission mechanism is arranged inside the cabinet and positioned on the lower side of the placing cavity, and the transmission mechanism is used for transmitting power to the ventilation device and the lifting mechanism.

2. The submergence-preventing liftable power distribution cabinet according to claim 1, wherein: the lifting mechanism also comprises fixed blocks which are fixedly arranged on the inner wall of the first transmission cavity in bilateral symmetry and are positioned on the lower side of the spring plate, first piston cavities which are symmetrically arranged at the left side and the right side of the first transmission cavity and are arranged at the lower side of the fixed block are arranged in the cabinet body, a first piston rod extending into the first transmission cavity and abutting against the lifting shaft is arranged in the first piston cavity in a sliding manner, the first piston rod is connected with the first piston cavity through a spring, the lifting shaft moves downwards until the spring plate is contacted with the fixed block, the spring plate is forced to pull the spring rod, so that the connecting shaft is separated from the lifting shaft, and the lifting shaft continuously moves downwards until the first piston rod is not contacted with the lifting shaft any more, and the first piston rod slides towards the first transmission cavity under the action of the spring.

3. The submergence-preventing liftable power distribution cabinet according to claim 1, wherein: the ventilation device comprises a placing cavity and an air inlet which is arranged on the right end wall of the placing cavity and extends backwards to the outside of the cabinet body, a third transmission cavity which is positioned on the lower side of the floating block is arranged in the cabinet body, a fan wheel shaft which extends into the placing cavity is rotatably arranged on the rear end wall of the third transmission cavity, a first belt wheel which is positioned in the third transmission cavity is fixedly arranged on the outer surface of the fan wheel shaft, a fan wheel which is positioned in the placing cavity is fixedly arranged on the left end of the fan wheel shaft, the ventilation device also comprises an air hole which is arranged on the left end wall of the placing cavity in an array mode, the air hole is communicated with the outside, a sliding groove which penetrates through the air hole is arranged in the cabinet body, a partition plate is arranged in the sliding groove in a sliding mode, a through hole which can be communicated with the air hole is arranged in the, the air hole is not ventilated any more, a second piston cavity positioned on the lower side of the sliding groove is arranged in the cabinet body, the second piston cavity is communicated with the first piston cavity through an air pipe, a second piston rod extending into the sliding groove and contacting with the partition plate is arranged in the second piston cavity in a sliding mode, and when the first piston rod slides in the first transmission cavity, the second piston rod moves downwards, so that the partition plate moves downwards, and the air hole is blocked; ventilation unit still includes the bilateral symmetry setting and is in the inflation chamber that cabinet body diapire upwards extends, the fixed buoyancy bag that is provided with in inflation chamber inside, the buoyancy bag with place the chamber diapire and pass through the gas tube intercommunication, work as the back is blocked up to the gas pocket, the fan wheel continues to rotate and passes through the gas tube to gas injection in the buoyancy bag makes the buoyancy bag inflation produces buoyancy.

4. The submergence-preventing liftable power distribution cabinet according to claim 1, wherein: the transmission mechanism comprises a motor which is arranged in the cabinet body and positioned on the left side of the third transmission cavity, an output shaft of the motor extends rightwards into the third transmission cavity, a spline shaft which is positioned in the third transmission cavity is arranged on the outer surface of the output shaft in a spline fit mode, a second bevel gear which is positioned in the third transmission cavity is fixedly arranged on the outer surface of the spline shaft, a third bevel gear which is positioned in the third transmission cavity is fixedly arranged at the right end of the spline shaft, an air cylinder which is positioned on the upper side of the output shaft is arranged in the cabinet body, a third piston rod which is in contact with the spline shaft and extends into the third transmission cavity is arranged in the air cylinder in a sliding mode, rotating shafts which extend into the second transmission cavity are symmetrically arranged on the front end wall and the rear end wall of the third transmission cavity in a rotating mode, and a fourth bevel gear which can be meshed with the second bevel gear and, a fifth bevel gear meshed with the first bevel gear is fixedly arranged on the end face of the rotating shaft in the second transmission cavity, and a second belt wheel which is positioned on the right side of the third bevel gear and is in fit connection with the first belt wheel through a second belt is fixedly arranged on the outer surface of the output shaft; the transmission mechanism is characterized by further comprising a buoyancy groove arranged on the bottom wall of the cabinet body and located between the inflation cavities, wherein spring connection in the buoyancy groove is provided with bilaterally symmetrical floating blocks, a fixed rod is fixedly arranged between the floating blocks, a controller which can be in contact with the fixed rod is fixedly arranged on the top wall of the buoyancy groove, and the controller controls movement of a third piston rod in the cylinder.