CN117079934A - Temperature control device and power distribution device of distribution transformer - Google Patents

Abstract

The application discloses a temperature control device and a power distribution device of a distribution transformer, and belongs to the field of transformers; the transformer is arranged in an underground box body in a pit; a cooling tank is arranged around the pit, soil is filled around the cooling tank, cooling liquid is contained in the cooling tank, and the cooling tank and the transformer are connected together through a circulating pipeline and a circulating pump to form a circulating cooling system; according to the application, the cooling tank is independently arranged to exchange heat with surrounding soil to keep a lower temperature, the transformer circulating cooling system and the air cooling system are connected with the cooling tank, the transformer circulating cooling system is used for cooling from the inside of the transformer, and the air cooling system is used for cooling from the outside of the transformer, so that the problem of cooling the buried transformer is solved.

Description

Temperature control device and power distribution device of distribution transformer

Technical Field

The application relates to the field of buried transformers, in particular to a temperature control device of a distribution transformer and the distribution device.

Background

The body of the buried transformer is arranged in a pit constructed by concrete, so that the ground surface space is not occupied, and the occupancy rate of ground surface resources can be effectively reduced. However, such transformer bodies are completely buried below the ground surface, and the heat generated when the transformer is operated is confined in a narrow space between the transformer body and the pit box. In the prior art, the cooling mode of the buried transformer generally adopts a ventilation system to directly blow air on the ground into the pit box, and hot air is discharged from an exhaust port of the pit box, so that heat in the pit box is taken away, and the cooling effect of the transformer is achieved. A similar technology is disclosed in the Chinese patent publication No. CN100565725C, which discloses a heat dissipation system of an underground combined transformer. However, when the temperature of the air on the ground is high, the effect of ventilation and cooling will be greatly reduced, even because the temperature of the air on the ground is higher than the temperature of the ground, the heat dissipation of the transformer will be hindered.

Disclosure of Invention

The application aims to provide a temperature control device and a power distribution device of a distribution transformer, and at least solves the problem of cooling of the existing buried transformer.

The technical scheme adopted by the application is as follows:

according to a first aspect of the present disclosure, the present application provides a temperature control device for a distribution transformer, comprising a transformer mounted in an underground cabinet in a pit; the periphery of the pit is provided with a cooling tank, the periphery of the cooling tank is filled with soil, cooling liquid is contained in the cooling tank, and the cooling tank and the transformer are connected together through a circulating pipeline and a circulating pump to form a circulating cooling system.

In an exemplary embodiment of the present disclosure, the cooling fluid is transformer oil or an antifreeze cooling fluid.

In an exemplary embodiment of the disclosure, a heat conduction column is disposed in the cooling tank, the heat conduction column is made of a metal material with good heat conductivity, penetrates through the wall of the cooling tank, is partially located in the cooling tank, is partially located outside the cooling tank, and is inserted into the sand.

In an exemplary embodiment of the present disclosure, a plurality of heat exchange tubes are provided in the cooling tank, and oil inputted from the transformer flows in a portion of the heat exchange tubes.

In an exemplary embodiment of the present disclosure, an agitating device is provided in the cooling tank, and the agitating device is used for agitating the cooling liquid.

According to a second aspect of the present disclosure, the present application provides a power distribution device, including the temperature control device of the above-mentioned power distribution transformer, and further including an above-ground box body located on the ground, where the bottom of the above-ground box body is a ventilation chamber, and the upper part is a power distribution chamber; an air inlet is formed in one side of the ventilation cavity, and an air outlet is formed in the opposite side of the ventilation cavity; the air inlet is connected with an air inlet driving device through an air pipe, and the air inlet driving device pressurizes air and sends the air into other heat exchange pipes of the cooling tank through the air pipe for heat exchange and cooling, and then sends the air into the underground box body.

In an exemplary embodiment of the disclosure, the underground box body is of a sandwich structure, and air spraying openings are formed in the inner walls of the periphery of the underground box body and face the central transformer; an exhaust pipe is arranged at the top of the underground box body and is connected with an exhaust outlet.

In one exemplary embodiment of the present disclosure, the air intake driving device includes a housing, a drying unit, a filtering unit, and a driving unit; the inside of the shell is provided with a front cavity and a rear cavity which are separated, a driving unit is arranged in the rear cavity, a drying unit is arranged above the front cavity, and a filtering unit is arranged below the front cavity; an air inlet hole is formed in the shell wall above the drying unit and is connected with the air inlet through an air pipe; the rear chamber is provided with an air outlet hole which is connected with the cooling tank through an air pipe; the air inlet driving device sucks air on the ground, firstly absorbs moisture in the air through the drying unit, then enters the filtering unit to filter dust, and then is sent into the cooling tank.

In one exemplary embodiment of the present disclosure, the drying unit includes a drawer-shaped case filled with a drying agent.

In an exemplary embodiment of the disclosure, the filtering unit includes a filtering cylinder, the inside of the filtering cylinder is of a cavity structure, the front side of the filtering cylinder is provided with a front end cover, and the rear end of the filtering cylinder is provided with a rear end cover; the side surface is provided with a vent hole, and the side surface is provided with a filter body for covering the vent hole; the rear end cover is provided with an exhaust hole which is communicated with the inside of the filter cartridge and the rear cavity; the inside semiconductor refrigeration piece that is equipped with of cartridge filter is used for refrigerating in the cartridge filter.

The application has the beneficial effects that: the application provides a temperature control device and a power distribution device of a distribution transformer.

Drawings

Fig. 1 is a perspective view showing a structure of a power distribution apparatus of the present application.

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

Fig. 3 is a schematic diagram of a transformer circulating cooling system according to the present application.

Fig. 4 is a perspective view showing the structure of a heat exchange tube in a cooling tank according to the present application.

Fig. 5 is a schematic view of an agitation apparatus provided in the cooling tank of the present application.

Fig. 6 is a perspective view showing a structure in which a heat-conducting column is provided in the cooling tank of the present application.

Fig. 7 is a perspective view showing the structure of the air intake driving apparatus of the present application.

Fig. 8 is a view showing the internal structure of the air intake driving apparatus of fig. 7.

Fig. 9 and 10 are perspective views showing the front structure of the air intake driving device of the present application.

Fig. 11 is a perspective view showing the structure of the drying unit of the present application.

Fig. 12 is a structural display view of the drying unit of the present application installed in a housing.

Fig. 13 is a structural representation of a filter unit of the present application.

Fig. 14 is a structural representation of the improved filter unit of the present application.

Fig. 15 is a cross-sectional view of fig. 14.

Fig. 16 is an illustration of the fin in the center tube of the improved filter unit of the present application.

Reference numerals illustrate: transformer 1, pit 2, underground box 3, box cover 301, air spraying port 302, exhaust pipe 303; a cooling tank 4, a heat exchange tube 401, a heat conduction column 402, a rotating shaft 403, an inner impeller 404 and an outer impeller 405; the concrete pump comprises a circulating pump 5, a concrete base 6, a drainage channel 7, a ground box body 8, an air outlet 801, an air inlet 802, a lamp box 9 and a telescopic rod 10; the device comprises a shell 11, a front chamber 111, a rear chamber 112, an air inlet 113, an air outlet 114, a first opening 115, a second opening 116 and a supporting plate 117; the drying unit 12, the box body 121, the filtering unit 13, the filter cartridge 131, the front end cover 132, the rear end cover 133, the filter body 134, the exhaust hole 135, the trapezoid table 136 and the outer flange 137; a drive unit 14, a central tube 15, a fan chamber 16, an electric fan 17, fins 18.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1 to 3, in one embodiment of the present application, a temperature control device for a distribution transformer is provided, where the distribution transformer is a buried transformer and is also an oil immersed distribution transformer; the transformer 1 is installed in a pit 2 provided underground, specifically, in an underground tank 3 in the pit 2. In order to solve the problem of cooling the transformer 1, the temperature control device comprises a cooling tank 4, wherein the cooling tank 4 is arranged around a pit 2, soil is filled around the cooling tank 4, and the cooling tank 4 is filled with cooling liquid, and the cooling liquid can be transformer oil or antifreeze cooling liquid. The cooling liquid in the cooling tank 4 is kept at a low temperature by heat exchange with the surrounding soil. The cooling tank 4 and the transformer 1 are connected together through the circulating pipeline and the circulating pump 5 to form a circulating cooling system, and the circulating cooling system conveys oil in the transformer 1 into the cooling tank 4 for cooling and then returns to the transformer 1, so that the transformer 1 is cooled and lowered.

The cooling tank 4 is in a cuboid shape and is made of stainless steel, is arranged at the center of the bottom of the pit 2 and is positioned under the underground box body 3; the cooling tank 4 is filled with sand and gravel soil around, and certain water permeability is maintained. A prefabricated concrete base 6 is arranged right above the cooling tank 4, and drainage channels 7 are formed around the concrete base 6 and the pit bottom. The underground box body 3 is placed on the concrete base 6, a transformer base is arranged in the underground box body 3 and on the concrete base 6, and the transformer 1 is arranged on the transformer base.

As shown in fig. 3, the circulation line sucks oil from the top of the transformer 1 and feeds it into the cooling tank 4. When the cooling liquid contained in the cooling tank 4 is transformer oil, the oil input from the transformer 1 is directly mixed with the oil in the cooling tank 4. This cooling form has a problem in that the oil in the transformer 1 is deteriorated during use to generate impurities, and the oil with the impurities directly enters the cooling tank 4 to cause pollution, thereby reducing the cooling effect of the cooling system. In addition, because the cooling tank 4 is buried below the concrete base 6, the cooling tank 4 is difficult to replace cooling liquid or to clean deposited impurities in the tank; it is preferable that the oil fed from the transformer 1 exchanges heat with the cooling liquid in the cooling tank 4 instead of being directly mixed. As shown in fig. 4, a heat exchange tube 401 is provided in the cooling tank 4, and the oil fed from the transformer 1 flows through the heat exchange tube 401 to exchange heat with the cooling liquid in the cooling tank 4 and thereby cool the oil.

As shown in fig. 5 and 6, an improved cooling tank 4 according to the present application is provided, in which a heat conduction column 402 and an agitation device are further added to the cooling tank 4, the heat conduction column 402 is made of a metal material with good heat conductivity, and the heat conduction column 402 penetrates through the cooling tank wall, and one part of the heat conduction column is located inside the cooling tank 4, and the other part of the heat conduction column is located outside the cooling tank 4 and is inserted into surrounding sand soil; the heat conductive column 402 is used to further conduct heat and cold to maintain the temperature of the cooling fluid in the cooling tank 4. As shown in fig. 5, the stirring device comprises a rotating shaft 403, an inner impeller 404 and an outer impeller 405, wherein the rotating shaft 403 penetrates through a heat exchange tube 401 with a rectangular section, and a rotating sealing connection structure is adopted at the penetrating position; an inner impeller 404 is arranged on a rotating shaft 403 positioned in the heat exchange tube 401, and the inner impeller 404 rotates together with the rotating shaft 403; an outer impeller 405 is mounted on a rotating shaft 403 located outside the heat exchange tube 401. The stirring device works as follows: the circulating pump 5 pressurizes the oil liquid to send the oil liquid into the heat exchange tube 401, the flowing oil liquid pushes the inner impeller 404 to rotate, the inner impeller 404 drives the outer impeller 405 outside the heat exchange tube 401 to rotate, and the outer impeller 405 rotates to stir the surrounding cooling liquid, so that the temperature distribution of the cooling liquid in the cooling tank 4 is more uniform, and the problems of high surrounding temperature and low heat exchange efficiency of the heat exchange tube 401 are solved.

Further, a liquid level meter and a temperature sensor are also installed in the cooling tank 4 and are used for detecting the liquid level and the temperature in the cooling tank. Furthermore, the cooling tank 4 is replenished with cooling liquid through a pipe extending to the ground. In the application, when the temperature of oil in the transformer 1 is higher than a preset value and the temperature in the cooling tank 4 is lower than the preset value, the circulating pump 5 is started to cool down.

As shown in fig. 2, the top of the underground cabinet 3 is provided with an inlet extending upward above the ground, and a cover 301 is provided at the inlet.

Referring to fig. 1 and 2, in one embodiment of the present application, there is further provided a power distribution device, where the power distribution device includes the above structure, and further includes an above-ground box 8 located on the ground, the bottom of the above-ground box 8 is a ventilation chamber, and the upper part is a power distribution chamber, and the power distribution chamber is used for placing a low-voltage cabinet, a high-voltage cabinet, and the like; the power distribution cavity both sides set up turn up formula lamp house 9, and lamp house 9 top edge rotates with ground box 8 to be connected, and lamp house 9 both sides are connected with ground box 8 through telescopic link 10, jack up lamp house 9 upwards when telescopic link 10 extends, and lamp house 9 upset is opened.

As shown in fig. 1 and 2, two sides of the ventilation chamber are provided with through holes, a shutter is installed in each through hole, in fig. 1, the right through hole of the ventilation chamber faces to the case cover 301 of the underground case 3, and the through hole is an exhaust hole 801; the vent chamber left side vent is the air inlet 802. As shown in fig. 2, the air inlet 802 is connected with an air inlet driving device through an air pipe, and the air is pressurized by the air inlet driving device, sent into the cooling tank 4 through the air pipe, subjected to heat exchange and temperature reduction, and then sent into the underground box 3. In the application, the underground box body 3 is of a sandwich structure, and air spouts 302 (shown in fig. 4) are arranged on the inner walls of the periphery of the underground box body 3, and the air spouts 302 face the central transformer 1. The top of the underground box body 3 is provided with an exhaust pipe 303, the exhaust pipe 303 is connected with an exhaust port 801, and an induced draft fan can be further added on the exhaust pipe 303. The air cooling system is formed by the structural arrangement. In the prior art, air on the ground is directly sent into an underground box body 3; in the application, the air pipe firstly passes through the cooling tank 4 to cool the air entering the underground box body 3. The air cooling system can solve the problem that the temperature of the overground air is higher than the underground temperature, so that the air entering the underground box body 3 can play a role in cooling.

In the above-mentioned scheme, the air pipe directly passes through the cooling tank 4, and more preferably, the air pipe is structurally connected with the heat exchange pipe 401 of the present application, and it should be noted that a plurality of heat exchange pipes 401 are provided in the present application, wherein part of the heat exchange pipes are connected into the air cooling system, and part of the heat exchange pipes are connected into the transformer circulating cooling system. The heat exchange tube 401 connected to the air cooling system is also provided with an agitating device, and the outer impeller 405 is driven to rotate by wind pressure, so that the temperature distribution in the cooling tank 4 is uniform.

Furthermore, in the application, the air cooling system and the transformer circulating cooling system can independently operate or simultaneously operate. The main function of the air cooling system is to reduce the temperature of the outer side of the transformer 1, and the transformer circulating cooling system is used for reducing the temperature of the inner side of the transformer. In the application, a temperature sensor is arranged in the underground box body 3, and when the temperature in the underground box body 3 is higher than a preset value, the air cooling system is started.

Further, when the air is moist or contains much dust, the air is fed into the underground cabinet 3 to make the underground cabinet 3 moist, accumulate dust, and deteriorate the operating environment of the transformer 1. Therefore, the application provides a novel air inlet driving device.

As shown in fig. 7 and 8, the air intake driving device includes a housing 11, a drying unit 12, a filtering unit 13, and a driving unit 14. The inside of the shell 11 is provided with a front chamber 111 and a rear chamber 112 which are separated, a driving unit 14 is arranged in the rear chamber 112, a drying unit 12 is arranged above the front chamber 111, and a filtering unit 13 is arranged below the front chamber 111; the shell wall above the drying unit 12 is provided with an air inlet hole 113, and the air inlet hole 113 is connected with an air inlet 802 through an air pipe. The rear chamber 112 is provided with an air outlet 114, the air outlet 114 being connected to the cooling tank 4 by an air duct. The air intake driving device sucks air on the ground, firstly absorbs moisture in the air through the drying unit 12, then enters the filtering unit 13 to filter dust, and then is discharged.

In one embodiment of the application, the drive unit 14 comprises an impeller which is driven in rotation by a motor.

As shown in fig. 9 and 10, in one embodiment of the present application, the drying unit 12 includes a drawer-shaped case 121, and the case 121 is filled with a drying agent. As shown in fig. 11, the inside of the case 121 is partitioned into a plurality of lattices by partition plates; the bottom plate of the box body 121 adopts a mesh plate, and ventilation holes are distributed on the mesh plate. As shown in fig. 10, the front side of the case 121 is provided with a rectangular first opening 115 at the upper portion and a circular second opening 116 at the lower portion. Support plates 117 are provided on both sides of the left and right side walls of the housing 11 and the lower edge of the first opening 115. As shown in fig. 8 and 9, the case 121 is inserted into the front chamber 111 through the first opening 115, the rear side plate of the case 121 abuts against the rear side wall of the front chamber 111, and the bottom plate edge of the case 121 is overlapped on the support plates 117 on both sides. As shown in fig. 7 and 12, the front side plate of the case 121 is larger than the first opening 115 in size, can cover the first opening 115, and is edge-mounted with a sealing strip, and is fixed to the case 11 by bolts. As shown in fig. 12, a handle is further provided on the front side plate of the case 121 to facilitate the extraction of the case 121.

As shown in fig. 13, in one embodiment of the present application, the filter unit 13 includes a cylindrical filter cartridge 131, the inside of the filter cartridge 131 is a cavity structure, a front end cover 132 is provided at the front side of the filter cartridge 131, and a rear end cover 133 is provided at the rear end. The side of the filter cartridge 131 is provided with a groove with an annular section, and ventilation holes are distributed in the groove. A cylindrical filter body 134 such as filter cloth or cotton is installed in the tank. The rear end cap 133 of the filter cartridge 131 is provided with a plurality of vent holes 135. In addition, the rear side edge of the filter cartridge 131 forms a trapezoidal land 136 and the front side edge of the filter cartridge 131 forms an outer flange 137.

As shown in fig. 7 to 10, the filter cartridge 131 is inserted into the front chamber 111 from the second opening 116 on the front side of the housing 11, and the rear-side stepped boss 136 of the filter cartridge 131 is caught in the through-hole on the rear side wall of the front chamber 111. The trapezoidal table 136 may have a sealing strip mounted thereon. As shown in fig. 7, the outer flange 137 of the filter cartridge 131 is sized larger than the second opening 116 to completely cover the second opening 116.

The filter cartridge 131 has only a filtering function, as shown in fig. 14 and 15, and is an improved filter cartridge 131 provided by the present application; the modified filter cartridge 131 has a cooling function. Specifically, a central tube 15 with a rectangular section is arranged in the center of the filter cartridge 131, the front end of the central tube 15 is connected to a front end cover 132 of the filter cartridge 131, and an opening communicated with the inside of the central tube 15 is formed in the front end cover 132; the rear end of the central tube 15 is connected to a rear end cap 133 of the filter cartridge 131, a fan chamber 16 is provided on the rear end cap 133, and an electric fan 17 is installed in the fan chamber 16. The central tube 15 is provided with a plurality of semiconductor refrigeration pieces on four sides, the cold end faces of the semiconductor refrigeration pieces face the outside filter cartridge 131, and the hot end faces of the semiconductor refrigeration pieces face the inside. Further, fins 18 are mounted on both end surfaces of the semiconductor refrigeration sheet, wherein the direction in which the fins 18 extend in the center tube 15 coincides with the longitudinal direction of the center tube 15 (as shown in fig. 16). In the application, the semiconductor refrigerating piece is used for refrigerating, so that a cooling space is formed in the filter cartridge 131, and air entering the filter cartridge 131 is cooled and discharged out of the filter cartridge 131. The electric fan 17 on the rear end cover 133 blows hot air in the central tube 15 to accelerate the heat dissipation speed of the hot end surface of the semiconductor refrigerating sheet, thereby improving the refrigerating efficiency of the semiconductor refrigerating sheet. The semiconductor refrigerating device provided by the application can be matched with the cooling tank 4 to rapidly refrigerate, so that the cooling efficiency is improved. The semiconductor refrigeration device can supplement the cooling capacity of the cooling tank 4.

It will be understood that the application has been described in terms of several embodiments, and that various changes and equivalents may be made to these features and embodiments by those skilled in the art without departing from the spirit and scope of the application. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the application without departing from the essential scope thereof. Therefore, it is intended that the application not be limited to the particular embodiment disclosed, but that the application will include all embodiments falling within the scope of the appended claims.

Claims (10)

1. A temperature control device of a distribution transformer comprises a transformer (1), wherein the transformer (1) is arranged in an underground box body (3) in a pit (2); the device is characterized in that a cooling tank (4) is arranged around the pit (2), soil is filled around the cooling tank (4), cooling liquid is contained in the cooling tank (4), and the cooling tank (4) and the transformer (1) are connected together through a circulating pipeline and a circulating pump (5) to form a circulating cooling system.

2. The temperature control device of a distribution transformer according to claim 1, wherein the cooling liquid is transformer oil or antifreeze cooling liquid.

3. The temperature control device of the distribution transformer according to claim 1, wherein a heat conduction column (402) is arranged in the cooling tank (4), the heat conduction column (402) is made of a metal material with good heat conductivity, the heat conduction column (402) penetrates through the wall of the cooling tank, one part of the heat conduction column is positioned in the cooling tank (4), and the other part of the heat conduction column is positioned outside the cooling tank (4) and is inserted into sand.

4. The temperature control device of a distribution transformer according to claim 1, characterized in that a plurality of heat exchange tubes (401) are provided in the cooling tank (4), and the oil inputted from the transformer (1) flows in a part of the heat exchange tubes (401).

5. The temperature control device of a distribution transformer according to claim 4, characterized in that an agitating device is provided in the cooling tank (4), which agitating device is used for agitating the cooling liquid.

6. A power distribution device, which is characterized by comprising the temperature control device of the power distribution transformer as claimed in claim 4, and further comprising an overground box body (8) positioned on the ground, wherein the bottom of the overground box body (8) is a ventilation chamber, and the upper part of the overground box body is a power distribution chamber; an air inlet (802) is formed in one side of the ventilation cavity, and an air outlet (801) is formed in the other opposite side of the ventilation cavity; the air inlet (802) is connected with an air inlet driving device through an air pipe, the air inlet driving device pressurizes air and sends the air into the rest heat exchange pipes (401) of the cooling tank (4) through the air pipe for heat exchange and cooling, and then the air is sent into the underground box body (3).

7. The power distribution device according to claim 6, wherein the underground box body (3) is of a sandwich structure, air spraying openings (302) are formed in the inner walls of the periphery of the underground box body (3), and the air spraying openings (302) face towards the central transformer (1); an exhaust pipe (303) is arranged at the top of the underground box body (3), and the exhaust pipe (303) is connected with an exhaust outlet (801).

8. The power distribution device according to claim 6, characterized in that the air intake driving device comprises a housing (11), a drying unit (12), a filtering unit (13), a driving unit (14); a front chamber (111) and a rear chamber (112) which are separated are arranged in the shell (11), a driving unit (14) is arranged in the rear chamber (112), a drying unit (12) is arranged above the front chamber (111), and a filtering unit (13) is arranged below the front chamber; an air inlet hole (113) is formed in the shell wall above the drying unit (12), and the air inlet hole (113) is connected with an air inlet (802) through an air pipe; the rear chamber (112) is provided with an air outlet hole (114), and the air outlet hole (114) is connected with the cooling tank (4) through an air pipe; the air inlet driving device sucks air on the ground, firstly absorbs moisture in the air through the drying unit (12), then enters the filtering unit (13) to filter dust, and then is sent into the cooling tank (4).

9. The electrical distribution device according to claim 8, characterized in that the drying unit (12) comprises a drawer-like box (121), the box (121) being filled with a desiccant.

10. The power distribution device according to claim 8, wherein the filtering unit (13) comprises a filtering cylinder (131), the inside of the filtering cylinder (131) is of a cavity structure, a front end cover (132) is arranged at the front side of the filtering cylinder (131), and a rear end cover (133) is arranged at the rear end of the filtering cylinder; the side surface is provided with a vent hole, and the side surface is provided with a filter body (134) for covering the vent hole; the rear end cover (133) is provided with an exhaust hole (135), and the exhaust hole (135) is communicated with the inside of the filter cartridge (131) and the rear cavity (112); the semiconductor refrigeration piece is arranged in the filter cartridge (131) and used for refrigerating in the filter cartridge (131).