阅读说明：本技术 基于窄带物联网的数据传输用网络配电箱 (Network distribution box for data transmission based on narrowband Internet of things ) 是由 曲亮 赵炳良 王东 张海容 于娇 史泽 杨琳 赵宇 张杨 于 2021-10-25 设计创作，主要内容包括：基于窄带物联网的数据传输用网络配电箱,涉及网络配电箱相关技术领域,现有的网络配电箱不能够根据安装条件调节网络配电箱安装位置的问题。底座两端分别固定有第一U形块和第二U形块,第一U形块的内侧转动连接有连接板,同时连接板固定在配电箱本体的外后壁底部,第二U形块的内部转动连接有气缸,且气缸与连接板相连接；通风管固定在配电箱本体的顶部,通风管与配电箱本体内部相通,通风管的内壁与连接管的外壁均设置有螺纹,且通风管与连接管之间为螺纹连接,连接管设置在通风管的上方,且连接管的内侧上方设置有密封组件,密封组件用于与连接管顶部实现开合。它够根据不同场合来调整配电箱本体的角度,以便进行安装,提高安装时的便利性。(Network distribution box for data transmission based on narrowband thing networking relates to the relevant technical field of network distribution box, and current network distribution box can not adjust the problem of network distribution box mounted position according to the installation condition. A first U-shaped block and a second U-shaped block are respectively fixed at two ends of the base, the inner side of the first U-shaped block is rotatably connected with a connecting plate, the connecting plate is fixed at the bottom of the outer rear wall of the distribution box body, and an air cylinder is rotatably connected inside the second U-shaped block and is connected with the connecting plate; the ventilation pipe is fixed at the top of block terminal body, and the ventilation pipe communicates with each other with block terminal body is inside, and the inner wall of ventilation pipe all is provided with the screw thread with the outer wall of connecting pipe, and is threaded connection between ventilation pipe and the connecting pipe, and the connecting pipe setting is in the top of ventilation pipe, and the inboard top of connecting pipe is provided with seal assembly, and seal assembly is used for realizing opening and shutting with the connecting pipe top. It can be according to the angle of different occasions adjustment block terminal body to install, convenience when improving the installation.)

1. The network distribution box for data transmission based on the narrowband Internet of things is characterized by comprising a base (1), an electrical element mounting plate (12) and a distribution box body (5), and further comprising a heat dissipation mechanism and an angle adjusting mechanism,

the distribution box body (5) is arranged on the base (1) through an angle adjusting mechanism, and the angle adjusting mechanism is used for driving the distribution box body (5) to tilt forwards and backwards, so that the distribution box body (5) is installed at a required tilt angle;

the heat dissipation mechanism is fixed at the top of the distribution box body (5) and used for dissipating heat inside the distribution box body (5);

the angle adjusting mechanism comprises a first U-shaped block (2), a second U-shaped block (3), a connecting plate (4) and a cylinder (6),

a first U-shaped block (2) and a second U-shaped block (3) are respectively fixed at two ends of the base (1), the inner side of the first U-shaped block (2) is rotatably connected with a connecting plate (4), the connecting plate (4) is fixed at the bottom of the outer rear wall of the distribution box body (5), an air cylinder (6) is rotatably connected inside the second U-shaped block (3), and the air cylinder (6) is connected with the connecting plate (4);

the heat dissipation mechanism comprises a ventilation pipe (17), a connecting pipe (20) and a sealing component (22),

ventilation pipe (17) are fixed at the top of block terminal body (5), ventilation pipe (17) communicate with each other with block terminal body (5) inside, the inner wall of ventilation pipe (17) all is provided with the screw thread with the outer wall of connecting pipe (20), and be threaded connection between ventilation pipe (17) and connecting pipe (20), connecting pipe (20) set up the top at ventilation pipe (17), and the inboard top of connecting pipe (20) is provided with seal assembly (22), seal assembly (22) are used for realizing opening and shutting with connecting pipe (20) top.

2. The network distribution box for data transmission based on the narrowband internet of things of claim 1, wherein the sealing assembly (22) comprises a motor (2201), a screw rod (2202), a movable block (2203), a connecting rod (2204) and a cover plate (2205);

the motor (2201) is arranged on the outer side of the connecting pipe (20), the output end of the motor (2201) is connected with the screw rod (2202), the screw rod (2202) is arranged inside the connecting pipe (20), two ends of the screw rod (2202) are respectively in threaded connection with 1 movable block (2203), 1 connecting rod (2204) is rotatably connected above each movable block (2203), the top of each connecting rod (2204) is connected with the cover plate (2205), and the outer diameter of the cover plate (2205) is larger than that of the connecting pipe (20).

3. The narrowband Internet of things-based network distribution box for data transmission according to claim 2, wherein the seal assembly (22) further comprises a guide rod (2206),

the 2 movable blocks (2203) are all in sliding connection with the guide rods (2206), and the guide rods (2206) are fixed below the screw rod (2202).

4. The narrowband internet of things-based network distribution box for data transmission according to claim 1, further comprising a sliding mechanism,

electric elements mounting panel (12) and slide mechanism all set up in block terminal body (5), and slide mechanism fixes on the interior back wall of block terminal body (5), and electric elements mounting panel (12) can be on slide mechanism around sliding, and electric elements mounting panel (12) are towards the door of block terminal body (5).

5. The network distribution box for data transmission based on the narrowband Internet of things of claim 4, wherein the sliding mechanism comprises 2 cross bars (11) and a handle (13),

the front end both sides of electrical component mounting panel (12) are respectively fixed with 1 handle (13), and the upper and lower both ends of electrical component mounting panel (12) are seted up through-hole (14), through-hole (14) are connected with horizontal pole (11), and horizontal pole (11) are fixed on the interior back wall of block terminal body (5).

6. The network distribution box for data transmission based on the narrowband Internet of things of claim 5, further comprising a limit bolt (16),

a groove is formed in the upper portion of one side wall of the electric element mounting plate (12), a limiting bolt (16) is arranged inside the groove, and the limiting bolt (16) penetrates through the through hole (14).

7. The narrowband internet of things-based network distribution box for data transmission according to claim 1, further comprising a first support pad (7) and a second support pad (8);

the top of second U-shaped piece (3) and the surface of base (1) are fixed with first supporting pad (7) and second supporting pad (8) respectively, and second supporting pad (8) are used for supporting the bottom of block terminal body (5).

8. The narrowband internet of things-based network distribution box for data transmission according to claim 1, further comprising a temperature sensor (9), a controller (10), a bracket (18), and a cooling fan (19);

a temperature sensor (9) is arranged at the bottom of the inner side of the distribution box body (5), the temperature sensor (9) is electrically connected with a controller (10), and the controller (10) is arranged on the outer side of the distribution box body (5);

a bracket (18) is fixed inside the ventilation pipe (17), and a cooling fan (19) is arranged below the bracket (18);

the temperature sensor (9) is used for detecting the internal temperature of the distribution box body (5) in real time and outputting a temperature signal to the controller (10);

and the controller (10) is used for receiving the temperature signal, controlling the cooling fan (19) to be turned on when the temperature is higher than a set value, and controlling the cooling fan (19) to be turned off when the temperature is not higher than the set value.

9. The network distribution box for data transmission based on the narrowband Internet of things of claim 1, further comprising a filter screen (21),

a filter screen (21) is arranged below the inner side of the connecting pipe (20).

10. The network distribution box for data transmission based on narrowband Internet of things of claim 5, wherein the sliding mechanism further comprises a ball (15),

balls (15) are arranged at two ends of the inner wall of the through hole (14).

Technical Field

The invention relates to the technical field of network distribution boxes, in particular to a network distribution box for data transmission based on a narrowband Internet of things.

Background

The network distribution box is also called as a network server cabinet and is used for combining and installing a panel, a plug-in box, an electronic element, a device, a mechanical part and a component to form an integral installation box, the network distribution box is composed of a frame and a cover plate, generally has a cuboid shape and is placed on the ground, the network distribution box provides adaptive environment and safety protection for the normal work of electronic equipment, because the existing network distribution box is usually provided with heat dissipation holes for heat dissipation, but because the heat dissipation holes are usually in a normally open state, the heat dissipation holes are inconvenient to close, so that moisture in the air is easily introduced into the inside of the network distribution box, causing damp damage to the electric components, and the conventional network distribution box is generally installed in a vertical type on the ground, but vertical installation needs higher space for current network block terminal can not adjust according to the installation condition, and the practicality is relatively poor.

Disclosure of Invention

The invention aims to solve the problems that an existing network distribution box is inconvenient to seal radiating holes, so that electrical elements are prone to being affected with damp and damaged, and the installation position of the network distribution box cannot be adjusted according to installation conditions.

The network distribution box for data transmission based on the narrowband Internet of things comprises a base, an electrical element mounting plate and a distribution box body, and is characterized by further comprising a heat dissipation mechanism and an angle adjusting mechanism,

the distribution box body is arranged on the base through an angle adjusting mechanism, and the angle adjusting mechanism is used for driving the distribution box body to tilt forwards and backwards, so that the distribution box body is installed at a required tilt angle;

the heat dissipation mechanism is fixed at the top of the distribution box body and used for dissipating heat inside the distribution box body;

the angle adjusting mechanism comprises a first U-shaped block, a second U-shaped block, a connecting plate and a cylinder,

a first U-shaped block and a second U-shaped block are respectively fixed at two ends of the base, the inner side of the first U-shaped block is rotatably connected with a connecting plate, the connecting plate is fixed at the bottom of the outer rear wall of the distribution box body, and an air cylinder is rotatably connected inside the second U-shaped block and connected with the connecting plate;

the heat dissipation mechanism comprises a ventilation pipe, a connecting pipe and a sealing component,

the ventilation pipe is fixed at the top of block terminal body, and the ventilation pipe communicates with each other with block terminal body is inside, and the inner wall of ventilation pipe all is provided with the screw thread with the outer wall of connecting pipe, and is threaded connection between ventilation pipe and the connecting pipe, and the connecting pipe setting is in the top of ventilation pipe, and the inboard top of connecting pipe is provided with seal assembly, and seal assembly is used for realizing opening and shutting with the connecting pipe top.

Preferably, the sealing assembly 22 comprises a motor 2201, a lead screw 2202, a movable block 2203, a connecting rod 2204 and a cover plate 2205;

the motor 2201 is arranged on the outer side of the connecting pipe 20, the output end of the motor 2201 is connected with a screw rod 2202, the screw rod 2202 is arranged inside the connecting pipe 20, two ends of the screw rod 2202 are respectively in threaded connection with 1 movable block 2203, 1 connecting rod 2204 is rotatably connected above each movable block 2203, the tops of 2 connecting rods 2204 are connected with a cover plate 2205, and the outer diameter of the cover plate 2205 is larger than that of the connecting pipe 20.

Preferably, the seal assembly 22 further includes a guide rod 2206,

the 2 movable blocks 2203 are all connected with the guide rod 2206 in a sliding manner, and the guide rod 2206 is fixed below the screw rod 2202.

Preferably, the electric box further comprises a sliding mechanism,

electric elements mounting panel 12 and slide mechanism all set up in block terminal body 5, and slide mechanism fixes on the interior back wall of block terminal body 5, and electric elements mounting panel 12 can slide around on slide mechanism, and electric elements mounting panel 12 is towards the door of block terminal body 5.

Preferably, the sliding mechanism comprises 2 crossbars 11 and handles 13,

two sides of the front end of the electric element mounting plate 12 are respectively fixed with 1 handle 13, the upper end and the lower end of the electric element mounting plate 12 are provided with through holes 14, the through holes 14 are connected with the cross rod 11, and the cross rod 11 is fixed on the inner rear wall of the distribution box body 5.

Preferably, the distribution box further comprises a limit bolt 16,

a groove is formed above one side wall of the electric element mounting plate 12, a limiting bolt 16 is arranged in the groove, and the limiting bolt 16 penetrates through the through hole 14.

The invention has the beneficial effects that:

(1) the connecting plate is driven to rotate in the first U-shaped block through the extension of the air cylinder in the second U-shaped block, so that the connecting plate can drive the distribution box body to rotate, the angle of the distribution box body can be adjusted according to different occasions, installation is facilitated, and convenience in installation is improved;

(2) the electric element mounting plate and the limiting bolt are arranged, when an electric element is mounted, the electric element mounting plate can slide out to the box door of the distribution box body, so that workers can conveniently mount the electric element, and the limiting bolt above the electric element mounting plate can be rotated to limit and fix the electric element after the electric element is mounted, so that the phenomenon that the electric element mounting plate is unstable in sliding after mounting is avoided;

(3) the connecting pipe and the filter screen are arranged, so that the interior of the distribution box body can be blown and cooled through the cooling fan inside the ventilation pipe, and meanwhile, dust in the air can be filtered through the filter screen inside the connecting pipe, so that the dust is prevented from being sucked into the distribution box body, and the practicability of the distribution box body is improved;

(4) be provided with lead screw and apron, can carry out the shutoff to the connecting pipe top through the apron to inside avoiding external moisture infiltration block terminal body, when the inside needs of block terminal body dispel the heat, can drive the lead screw through the motor and rotate, make the lead screw drive two sets of movable blocks and move in opposite directions, and drive the apron through the connecting rod of movable block top and rise and the connecting pipe separation, can ventilation cooling, avoid electrical component to wet the damage.

Drawings

Fig. 1 is a schematic front view structure diagram of a network distribution box for data transmission based on a narrowband internet of things;

FIG. 2 is a schematic structural diagram of a side view of the power distribution box body lying down;

FIG. 3 is a schematic view of a second U-shaped block;

FIG. 4 is a schematic diagram of a vertical rear side view structure of a power distribution box body;

FIG. 5 is a schematic diagram of an electrical component mounting board structure;

FIG. 6 is a schematic diagram of a side view cross-sectional structure of a power distribution box body;

fig. 7 is a sectional structure diagram of the vent pipe and the connecting pipe.

Detailed Description

The first embodiment is as follows: the network distribution box for data transmission based on the narrowband internet of things according to the embodiment is described with reference to fig. 1, fig. 2, fig. 4 and fig. 7, and comprises a base 1, an electrical component mounting plate 12 and a distribution box body 5, and is characterized in that the distribution box further comprises a heat dissipation mechanism and an angle adjustment mechanism,

the distribution box body 5 is arranged on the base 1 through an angle adjusting mechanism, and the angle adjusting mechanism is used for driving the distribution box body 5 to tilt back and forth, so that the distribution box body 5 is installed at a required tilt angle;

the heat dissipation mechanism is fixed at the top of the distribution box body 5 and used for dissipating heat inside the distribution box body 5;

the angle adjusting mechanism comprises a first U-shaped block 2, a second U-shaped block 3, a connecting plate 4 and a cylinder 6,

a first U-shaped block 2 and a second U-shaped block 3 are respectively fixed at two ends of the base 1, the inner side of the first U-shaped block 2 is rotatably connected with a connecting plate 4, meanwhile, the connecting plate 4 is fixed at the bottom of the outer rear wall of the distribution box body 5, the inner part of the second U-shaped block 3 is rotatably connected with a cylinder 6, and the cylinder 6 is connected with the connecting plate 4;

the heat dissipation mechanism includes a ventilation pipe 17, a connection pipe 20 and a sealing assembly 22,

the ventilation pipe 17 is fixed at the top of block terminal body 5, and ventilation pipe 17 communicates with each other with block terminal body 5 is inside, and the inner wall of ventilation pipe 17 and the outer wall of connecting pipe 20 all are provided with the screw thread, and be threaded connection between ventilation pipe 17 and the connecting pipe 20, and connecting pipe 20 sets up the top at ventilation pipe 17, and is provided with seal assembly 22 above the inboard of connecting pipe 20, and seal assembly 22 is used for realizing opening and shutting with the connecting pipe 20 top.

In this embodiment, as shown in fig. 1, fig. 2, fig. 3 and fig. 4, the two ends of the base 1 are respectively fixed with the first U-shaped block 2 and the second U-shaped block 3, the inner side of the first U-shaped block 2 is rotatably connected with the connecting plate 4, the connecting plate 4 is fixed at the bottom of the outer side of the distribution box body 5, the inner side of the second U-shaped block 3 is rotatably connected with the cylinder 6, the cylinder 6 is connected with the connecting plate 4, the cylinder 6 in the second U-shaped block 3 extends to push the connecting plate 4 at the bottom of the distribution box body 5, the connecting plate 4 is driven to rotate in the first U-shaped block 2, so that the distribution box body 5 is driven to rotate through the connecting plate 4, vertical or horizontal installation can be selected according to installation conditions, and the installation range of the vertical or horizontal installation can be improved.

As shown in fig. 1 and 3, the top of second U-shaped block 3 and the surface of base 1 are fixed with first supporting pad 7 and second supporting pad 8 respectively, can be after block terminal body 5 is vertical or horizontal installation to it through first supporting pad 7 and second supporting pad 8, improve its stability.

The second embodiment is as follows: referring to fig. 7, the embodiment is further defined by the network distribution box for data transmission based on narrow-band internet of things according to the first embodiment, in the embodiment, the sealing assembly 22 includes a motor 2201, a screw 2202, a movable block 2203, a connecting rod 2204 and a cover plate 2205;

the motor 2201 is arranged on the outer side of the connecting pipe 20, the output end of the motor 2201 is connected with a screw rod 2202, the screw rod 2202 is arranged inside the connecting pipe 20, two ends of the screw rod 2202 are respectively in threaded connection with 1 movable block 2203, 1 connecting rod 2204 is rotatably connected above each movable block 2203, the tops of 2 connecting rods 2204 are connected with a cover plate 2205, and the outer diameter of the cover plate 2205 is larger than that of the connecting pipe 20.

The third concrete implementation mode: referring to fig. 7, the embodiment is further defined by the network distribution box for data transmission based on narrowband internet of things according to the second embodiment, in the embodiment, the sealing assembly 22 further includes a guide rod 2206,

the 2 movable blocks 2203 are all connected with the guide rod 2206 in a sliding manner, and the guide rod 2206 is fixed below the screw rod 2202.

The fourth concrete implementation mode: the embodiment is described with reference to fig. 1, and the embodiment is further limited to the network distribution box for data transmission based on narrow-band internet of things described in the first embodiment, in the embodiment, the distribution box further includes a sliding mechanism,

electric elements mounting panel 12 and slide mechanism all set up in block terminal body 5, and slide mechanism fixes on the interior back wall of block terminal body 5, and electric elements mounting panel 12 can slide around on slide mechanism, and electric elements mounting panel 12 is towards the door of block terminal body 5.

The fifth concrete implementation mode: referring to fig. 6, the embodiment is further limited to the network distribution box for data transmission based on narrowband internet of things according to the fourth embodiment, in the embodiment, the sliding mechanism includes 2 crossbars 11 and a handle 13,

two sides of the front end of the electric element mounting plate 12 are respectively fixed with 1 handle 13, the upper end and the lower end of the electric element mounting plate 12 are provided with through holes 14, the through holes 14 are connected with the cross rod 11, and the cross rod 11 is fixed on the inner rear wall of the distribution box body 5.

The sixth specific implementation mode: referring to fig. 5, the embodiment is further defined by the network distribution box for data transmission based on narrowband internet of things according to the fifth embodiment, in the embodiment, the distribution box further includes a limit bolt 16,

a groove is formed above one side wall of the electric element mounting plate 12, a limiting bolt 16 is arranged in the groove, and the limiting bolt 16 penetrates through the through hole 14.

The seventh embodiment: the embodiment is described with reference to fig. 2, and is further defined by a network distribution box for data transmission based on a narrowband internet of things according to the first embodiment, in the embodiment, the distribution box further includes a first support pad 7 and a second support pad 8;

the top of second U-shaped piece 3 and the surface of base 1 are fixed with first supporting pad 7 and second supporting pad 8 respectively, and second supporting pad 8 is used for supporting the bottom of block terminal body 5.

The specific implementation mode is eight: the present embodiment is described with reference to fig. 1 and fig. 7, and is further defined by a network distribution box for data transmission based on narrowband internet of things according to the first embodiment, in this embodiment, the distribution box further includes a temperature sensor 9, a controller 10, a bracket 18, and a cooling fan 19;

a temperature sensor 9 is arranged at the bottom of the inner side of the distribution box body 5, the temperature sensor 9 is electrically connected with a controller 10, and the controller 10 is arranged on the outer side of the distribution box body 5;

a bracket 18 is fixed inside the ventilation pipe 17, and a cooling fan 19 is arranged below the bracket 18;

the temperature sensor 9 is used for detecting the internal temperature of the distribution box body 5 in real time and outputting a temperature signal to the controller 10;

and the controller 10 is used for receiving the temperature signal, controlling the cooling fan 19 to be turned on when the temperature is higher than a set value, and controlling the cooling fan 19 to be turned off when the temperature is not higher than the set value.

In this embodiment, when the temperature inside the distribution box body 5 is high, the controller 10 opens the motor 2201 outside the connection pipe 20, so that the motor drives the lead screw 2202 to rotate, the lead screw 2202 drives the movable blocks 2203 with two ends connected by threads to move in opposite directions, and the connection rod 2204 above the movable blocks 2203 drives the cover plate 2205 to ascend, so that the cover plate 2205 is separated from the top of the connection pipe 20, and ventilation and heat dissipation are facilitated.

The specific implementation method nine: in this embodiment, the network distribution box for data transmission based on the narrowband internet of things according to the first embodiment is further defined, in this embodiment, the distribution box further includes a filter screen 21,

a filter screen 21 is arranged below the inner side of the connecting pipe 20.

In the present embodiment, as shown in fig. 1 and 7, a duct 17 is fixed to the top of the distribution box body 5, and a bracket 18 is fixed to the inside of the duct 17, meanwhile, a heat radiation fan 19 is arranged below the bracket 18, the inner wall of the ventilation pipe 17 and the outer wall of the connecting pipe 20 are both provided with threads, the ventilation pipe 17 is in threaded connection with the connecting pipe 20, so as to be separated from the ventilation pipe 17 by rotating the connection pipe 20 in such a manner that the filter screen 21 inside the connection pipe 20 is disassembled and cleaned, the connection pipe 20 is disposed above the ventilation pipe 17, a sealing component 22 is arranged above the inner side of the connecting pipe 20, a filter screen 21 is arranged below the inner side of the connecting pipe 20, so as to can filter impurity such as dust in the air when cooling fan 19 blows the cooling to block terminal body 5 is inside, avoid the dust to get into block terminal body 5 and influence electric elements's use.

The detailed implementation mode is ten: in this embodiment, the network distribution box for data transmission based on the narrowband internet of things according to the fifth embodiment is further defined, in this embodiment, the sliding mechanism further includes a ball 15,

the inner wall of the through hole 14 is provided at both ends with balls 15.

In this embodiment, as shown in fig. 1, 5 and 6, handles 13 are fixed to left and right ends of the electrical element mounting plate 12, through holes 14 are formed in upper and lower ends of the electrical element mounting plate 12, balls 15 are arranged at two ends of an inner wall of each through hole 14, so that the electrical element mounting plate 12 can slide outwards when an electrical element is mounted, and therefore the electrical element is conveniently mounted, each through hole 14 is connected with the corresponding cross rod 11, the cross rods 11 are fixed to two ends of the inner wall of the distribution box body 5, a groove is formed above the electrical element mounting plate 12, a limit bolt 16 is arranged inside the groove, and the limit bolt 16 penetrates through the through holes 14, so that the limit bolt 16 is rotated after mounting to abut against the cross rods 11 in the through holes 14, and the position of the electrical element mounting plate 12 can be limited and fixed.

The working principle of the application is as follows:

when the network distribution box for data transmission based on the narrowband Internet of things is installed, firstly, the air cylinder 6 in the second U-shaped block 3 is opened to push the connecting plate 4 to rotate in the first U-shaped block 2, the distribution box body 5 is jacked up, the distribution box body 5 abuts against the second supporting pad 8 to support the distribution box body, and vertical installation can be carried out, when an electrical element is installed, the handles 13 at two ends of the electrical element installation plate 12 can be pulled to drive the electrical element installation plate 12 to slide on the cross rod 11, the electrical element installation plate 12 is pulled out, the electrical element is convenient to install, after the electrical element installation plate 12 is reset, the limiting bolt 16 above the electrical element installation plate 12 is rotated to abut against the cross rod 11, so that the positions of the electrical element installation plate 12 and the electrical element can be limited, in the using process, the temperature can be detected in real time through the temperature sensor 9 in the distribution box body 5, and transmits the temperature signal to the controller 10, when the temperature is high, the controller 10 opens the motor 2201 outside the connecting pipe 20 to make it drive the lead screw 2202 to rotate, the lead screw 2202 drives the two sets of movable blocks 2203 to move oppositely, and drives the cover plate 2205 to rise through the connecting rod 2204, at the same time, the controller 10 opens the cooling fan 19 inside the ventilation pipe 17 to blow air to cool the inside of the distribution box body 5, when blowing air to the inside of the distribution box body 5, the filter screen 21 below the inner side of the connecting pipe 20 filters the dust in the air to avoid dust suction, when the temperature returns to normal, the controller 10 closes the cooling fan 19 to stop blowing air, and opens the motor 2201 to drive the lead screw 2202 to drive the movable blocks 2203 to move backwards, and drives the cover plate 2205 to fall through the connecting rod 2204 to plug the top of the connecting pipe 20, preventing moisture from penetrating the distribution box body 5.