Energy-saving heat dissipation ring main unit

Abstract

The invention relates to an energy-saving heat dissipation ring main unit which comprises a ring main unit body, an air inlet, an air outlet, a negative pressure exhaust fan and a buried water tank buried 1.5 m below the ground, and the buried water tank is filled with a cooling medium. An air outlet of the negative pressure exhaust fan is communicated with the air inlet, the air inlet is connected with an air inlet pipeline, and one end of the air inlet pipeline penetrates through the cooling medium in the buried water tank and then extends out of the ground; the air inlet pipeline comprises a main air pipe coiled in the buried water tank and a plurality of branch air pipes used for connecting adjacent pipe walls of the main air pipe, and the main air pipe and the branch air pipes are made of heat conduction metal materials; a plurality of fractures are formed in the main air pipe at intervals, flexible reducer pipes are connected to the fractures in a sealed mode, the negative pressure exhaust fan is connected with a pulse controller, and the pulse controller is configured to control the negative pressure exhaust fan to start and stop and / or increase or decrease the rotating speed according to the set frequency. According to the invention, the temperature of the ambient air conveyed to the air inlet can be reduced without additional refrigeration equipment, so that the heat dissipation effect of the ring main unit body is improved.

Description

Technical Field

[0001] The present application relates to the technical field of ring main units, and in particular to an energy-saving heat dissipation ring main unit. Background Art

[0002] A ring main unit is a set of power transmission and distribution electrical equipment (high-voltage switchgear) installed in a metal or non-metal insulated cabinet or made into a prefabricated sectionalized ring main power supply unit. Its core part uses a load switch and a fuse, and has the advantages of simple structure, small volume, low price, improved power supply parameters and performance, and power supply safety. It is widely used in distribution substations and box-type substations at load centers such as urban residential areas, high-rise buildings, large public buildings, and industrial enterprises.

[0003] In existing ring main units, heat dissipation fans are usually used for heat dissipation. In order to save energy, temperature sensors are usually set to cooperate with the heat dissipation fans. When the temperature inside the ring main unit exceeds the threshold, after the temperature sensor feeds back the temperature, the control system sends an instruction to start the heat dissipation fan, and then heat dissipation work is carried out to achieve automatic heat dissipation.

[0004] In the related technology, the Chinese patent application with the application number CN202411071861.9 proposed a gas-insulated ring main unit and its heat dissipation method. The heat dissipation structure includes a heat dissipation component, and the heat dissipation component includes a heat conduction plate and a heat insulation cover. An air suction pipe is arranged inside the heat insulation cover, an air inlet pipe is arranged at the top of the air suction pipe, a U-shaped cylinder is arranged at the bottom of the air suction pipe, an exhaust pipe is arranged at one end of the U-shaped cylinder, and a fan is installed on the exhaust pipe; it also includes a heat insulation component, and the heat insulation component includes a water storage tank. A water outlet pipe and a water return pipe are respectively arranged at both ends of the water storage tank. A water pump and a first valve are respectively arranged at the bottom ends of the water outlet pipe and the water return pipe, and a bent pipe is arranged at the top of the water outlet pipe and the water return pipe. The invention makes the air inlet pipe generate suction through the fan, and external gas enters the top of the cabinet through the air inlet. During the process of being conveyed to the exhaust end through the air suction pipe, the high-temperature gas in the heat insulation cover is carried outwards by the air suction head, so that the gas-insulated ring main unit dissipates heat and cools down through a specific inlet and a specific outlet; and by starting the water pump, the low-temperature water body in the water storage tank is continuously supplied to the bent pipe through the water outlet pipe, and the cooling effect of the low-temperature water on the top of the cabinet is used to achieve the effect of blocking the high temperature on the top of the cabinet.

[0005] The above-mentioned related technology has the following defects: when cooling the ring main unit through circulating water, there is a risk of leakage at the interfaces of the circulating water pipe network after long-term use; moreover, when the temperature difference between day and night is large, water droplets will condense on the outer wall of the circulating water pipe network, which is not conducive to maintaining a dry environment in the ring main unit and will instead increase the dehumidification burden of the ring main unit; in addition, the fan and the water pump will also generate a certain amount of heat when working for a long time, and it is difficult to reduce the energy consumption, which is not conducive to the realization of energy saving of the ring main unit. Summary of the Invention

[0006] To address the problem in the prior art that using circulating cooling water for temperature reduction poses risks of leakage and condensation, which increases the dehumidification burden of the ring main unit, this application provides an energy-saving heat dissipation ring main unit.

[0007] The energy-saving heat dissipation ring main unit provided by this application adopts the following technical solutions: An energy-saving heat dissipation ring main unit includes a ring main unit body, an air inlet and an air outlet provided on the ring main unit body. A buried water tank is arranged below the ring main unit body and is buried more than 1.5 m underground. A cooling medium is filled in the buried water tank. A negative pressure exhaust fan is also provided on the ring main unit body. The air outlet of the negative pressure exhaust fan is communicated with the air inlet, and the air inlet is connected with an air inlet pipe. One end of the air inlet pipe passes through the cooling medium in the buried water tank, extends out of the ground, and extends to one side of the ring main unit body. The air inlet pipe includes a main air pipe coiled in the buried water tank and a plurality of branch air pipes used to connect adjacent pipe walls of the main air pipe. Both the main air pipe and the branch air pipes are made of heat-conducting metal materials. A plurality of breaks are spaced on the main air pipe, and flexible variable-diameter pipes are hermetically connected at the breaks. The negative pressure exhaust fan is connected with a pulse controller, which is configured to control the start-stop and / or speed increase and decrease of the negative pressure exhaust fan at a set frequency, so that the plurality of flexible variable-diameter pipes change their diameters when the negative pressure exhaust fan starts and stops, promoting the air flow turbulence in the main air pipe and the disturbance of the cooling medium in the buried water tank.

[0008] Furthermore, a fixing frame for connecting the pipe bodies at both ends of the break is fixedly connected to the main air pipe at the break. The inner dimension of the fixing frame along the radial direction of the main air pipe is larger than the outer diameter of the flexible variable-diameter pipe when it expands.

[0009] Furthermore, the part of the main air pipe located in the buried water tank is integrally in a "U" shape and includes two vertical sections and a horizontal section. The flexible variable-diameter pipes are distributed on both the vertical sections and the horizontal section, and the branch air pipes are used to connect the two vertical sections.

[0010] Furthermore, the diameter of the branch air pipe is smaller than that of the main air pipe. A plurality of branch air pipes are distributed in a net shape between the two vertical sections, and the two intersecting branch air pipes are not communicated at the intersection.

[0011] Furthermore, a smooth transition surface is provided at the corner of the connection part between the branch air pipe and the main air pipe.

[0012] Furthermore, a number of spoiler plates spaced from the flexible variable-diameter pipes are provided on the fixing frame.

[0013] Further, a condensation tank is communicatively disposed between the main air duct and the negative pressure exhaust fan. A plurality of condensation plates in the shape of truncated cones and sleeved with each other in sequence from bottom to top are fixedly connected in the condensation tank. Adjacent two condensation plates are spaced apart. The bottom opening diameters and the top opening diameters of the plurality of condensation plates from bottom to top both show an increasing trend. The bottom of the condensation tank is convexly provided with an annular water storage tank downward. A plurality of weak spring one-way valves that only allow fluid to flow out of the condensation tank are arranged on the bottom wall of the annular water storage tank.

[0014] Further, a plurality of water guide grooves are arranged on the condensation plates along their conical surfaces.

[0015] Further, a plurality of heat conducting fins are fixedly connected to the outer wall of the underground water tank.

[0016] Further, one end of the air inlet pipe extending to one side of the ring main cabinet body is connected with a rainproof air inlet assembly. A dustproof member is arranged at the air inlet end of the rainproof air inlet assembly.

[0017] In summary, the beneficial technical effects of the present application are as follows: 1. By burying an underground water tank filled with a cooling medium underground, the cooling medium in the underground water tank exchanges heat with the surrounding soil to achieve natural cooling of the cooling medium, which is especially suitable when the outdoor temperature is relatively high in summer. It can reduce the temperature of the ambient air transported by the negative pressure exhaust fan to the air inlet of the ring main cabinet body, thereby improving the heat dissipation effect on the ring main cabinet body. Moreover, this cooling of the ambient air does not require the intervention of additional external refrigeration equipment, with lower energy consumption, and is more in line with the energy conservation and environmental protection requirements of outdoor ring main cabinets. Furthermore, the cooling effect of the underground water tank directly acts on the air entering the ring main cabinet body, with higher heat exchange efficiency. The cooled ambient air is directly transported from underground to the ring main cabinet body, and the probability of its secondary temperature rise by the ambient temperature is lower, making the heat dissipation effect on the ring main cabinet body better. And when the air inlet pipe passes through the underground water tank, the ambient air does not directly contact the cooling medium, which directly avoids the possibility of introducing moisture during ventilation and cooling and has no impact on the dehumidification burden in the ring main cabinet body. 2. By controlling the negative pressure exhaust fan to intermittently start and stop and / or increase or decrease the rotation speed at a set frequency through a pulse controller, when the flexible variable diameter pipe changes its diameter following the working state switching of the negative pressure exhaust fan, on the one hand, it can promote the turbulent effect of the ambient air flowing in the main air duct to improve the heat exchange efficiency between the ambient air and the cooling medium outside the main air duct. On the other hand, when the flexible variable diameter pipe contracts and returns to its original state, it can promote the disturbance and local eddy current of the surrounding cooling medium, and thus can also improve the heat exchange efficiency between the cooling medium in the underground water tank and the ambient air in the main air duct, without the need to additionally set external power components, and the energy-saving effect is more obvious. 3. By fixedly connecting or flexibly hinging a spoiler that integrally or separately wraps around the flexible variable-diameter pipe on the fixing frame, the disturbance effect of the flexible variable-diameter pipe on the cooling medium during diameter variation can be further improved. For example, directly guiding or restricting the transmission direction of the disturbed cooling medium, or further expanding the disturbance effect of the highly flexible variable-diameter pipe on the cooling medium during diameter variation through the swinging of the spoiler on the fixing frame, or promoting the circulating convection of the low-temperature cooling medium in the lower layer and the medium-temperature cooling medium in the upper layer of the buried water tank to ensure the cooling effect of the cooling medium on the ambient air; 4. By making multiple branch air ducts that intersect and form a mesh not connected at the intersection points, on the one hand, the occurrence of turbulent flow in the branch air ducts can be avoided, which affects the overall fluidity of the ambient air in the air inlet duct; on the other hand, the multiple branch air ducts can present a certain three-dimensional heat dissipation structure in the buried water tank, improving the cooling effect of the cooling medium on the ambient air in the branch air ducts. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the overall structural sectional view of the embodiment of the present application; Figure 2 is the sectional view of the buried water tank and the air inlet duct of the embodiment of the present application; Figure 3 is Figure 2 the partial enlarged schematic view of part A in Figure 4 is Figure 2 the partial enlarged schematic view of part B in Figure 5 is Figure 2 the partial enlarged schematic view of part C in

[0019] DESCRIPTION OF THE REFERENCE NUMERALS: 1, Ring main cabinet body; 11, Air inlet; 12, Air outlet; 2, Buried water tank; 21, Heat conduction fins; 3, Negative pressure exhaust fan; 4, Air inlet duct; 41, Main air duct; 411, Vertical section; 412, Horizontal section; 413, Break; 42, Branch air duct; 51, Flexible variable-diameter pipe; 52, Fixing frame; 53, Spoiler; 61, Condensation tank; 62, Condensation plate; 63, Annular water storage tank; 64, Weak spring check valve; 71, Rainproof air inlet assembly; 72, Dust-proof part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0021] An energy-saving heat dissipation ring main switchgear is disclosed in an embodiment of the present application. Referring to Figure 1 and Figure 2 , it includes a ring main switchgear body 1 and an air inlet 11 and an air outlet 12 provided on the ring main switchgear body 1. Specifically, the air inlet 11 is arranged on the lower side wall of the ring main switchgear body 1, and the air outlet 12 is arranged on the upper side wall of the ring main switchgear body 1. A buried water tank 2 buried more than 1.5 m underground is provided below the ring main switchgear body 1. The buried water tank 2 is filled with a cooling medium. Specifically, the buried water tank 2 is buried underground and more than 1.5 m away from the ground. The cooling medium can be water, ethylene glycol solution, salt hydrates (such as sodium acetate trihydrate), bio-based phase change materials (such as palm wax), etc. In this embodiment, the cooling medium is taken as cooling water; the buried water tank 2 is made of a heat-conducting material, such as stainless steel. A negative pressure exhaust fan 3 is also provided on the ring main switchgear body 1. The air outlet of the negative pressure exhaust fan 3 is communicated with the air inlet 11, and the air inlet is connected with an air inlet pipe 4. One end of the air inlet pipe 4 passes through the cooling medium in the buried water tank 2 and extends out of the ground and extends to one side of the ring main switchgear body 1, and the part of the air inlet pipe located outside the buried water tank 2 is wrapped with heat insulation cotton.

[0022] The air inlet pipe 4 includes a main air pipe 41 coiled in the buried water tank 2 and a plurality of branch air pipes 42 for connecting adjacent pipe walls of the main air pipe 41. Both the main air pipe 41 and the branch air pipes 42 are made of a heat-conducting metal material, such as copper or aluminum.

[0023] A plurality of breaks 413 are spaced apart on the main air duct 41, and a flexible diameter-changing pipe 51 is hermetically connected to the break 413. The flexible diameter-changing pipe 51 is made of silica gel or fluororubber, and the flexible diameter-changing pipe 51 is in a spiral corrugated shape or has a folded cavity, so as to allow axial expansion and contraction and radial deformation. The negative pressure exhaust fan 3 is connected to a pulse controller, and the pulse controller is configured to control the start and stop of the negative pressure exhaust fan 3 at a set frequency and / or increase or decrease the rotation speed. For example, after working for 2 minutes, it stops for 30 seconds, or a frequency converter is connected between the pulse controller and the negative pressure exhaust fan 3, and the negative pressure exhaust fan 3 is controlled by the frequency converter to increase or decrease the rated rotation speed at a certain frequency, and stops for 30 seconds after working for 5 to 10 minutes each time, so that the plurality of flexible diameter-changing pipes 51 perform intermittent diameter change when the negative pressure exhaust fan 3 starts and stops, promoting the air flow turbulence in the main air duct 41 and the disturbance of the cooling medium in the buried water tank 2. Among them, the frequency at which the pulse controller controls the negative pressure exhaust fan 3 to switch the working state takes the ambient temperature or the temperature in the ring main cabinet body 1 as a measurement index, following the principle that the higher the target temperature, the faster the control switching frequency, so as to enhance the cooling effect of the buried water tank 2 on the air flow in the air inlet pipe 4.

[0024] And, referring to Figure 2 、 Figure 3 and Figure 4 , a fixing frame 52 for connecting the pipe bodies at both ends of the break 413 is fixedly connected to the main air duct 41 at the break 413. The inner dimension of the fixing frame 52 along the radial direction of the main air duct 41 is larger than the outer diameter of the flexible diameter-changing pipe 51 when it is expanded. In specific settings, the fixing frame 52 can be at least three fixing rods that are circumferentially arrayed at equal intervals along the axial direction of the main air duct 41. Both ends of the fixing rod are fixedly connected to the pipe bodies at both ends of the break 413 to ensure the overall structural stability of the main air duct 41.

[0025] Therefore, by taking advantage of the property that the soil at a depth of 1 to 3 meters underground has a constant temperature throughout the year (usually the temperature at a depth of 1.5 meters underground is stable at 10 to 20 °C), the ground-mounted water tank 2 filled with a cooling medium is buried underground, so that the cooling medium in the ground-mounted water tank 2 exchanges heat with the surrounding soil to achieve the natural cooling of the cooling medium, which is particularly suitable for cooling the ambient air when the outdoor ambient temperature in summer is as high as 30 °C to 40 °C. When the ring main unit 1 of the present application is working, the negative pressure exhaust fan 3 is started. When the negative pressure exhaust fan 3 is working, it can suck the relatively high-temperature ambient air into the main air duct 41 and a plurality of branch air ducts 42 through the air inlet duct 4. When the ambient air flows in the main air duct 41 and the branch air ducts 42, it can exchange heat with the cooling medium in the ground-mounted water tank 2 by means of the heat conduction effect of the main air duct 41 or the branch air ducts 42, so as to reduce the temperature of the ambient air transported by the negative pressure exhaust fan 3 to the air inlet 11 of the ring main unit 1, thereby improving the heat dissipation effect of the ring main unit 1; and this cooling of the ambient air is achieved by the heat exchange of the ground-mounted water tank 2 buried underground, without the intervention of additional external refrigeration equipment, with lower energy consumption, and more in line with the energy conservation and environmental protection requirements of outdoor ring main units; in addition, since the ground-mounted water tank 2 mainly used for cooling is arranged underground, it will not introduce new risks to the ring main unit 1, with higher reliability; and, the cooling effect of the ground-mounted water tank 2 directly acts on the air entering the ring main unit 1, with higher heat exchange efficiency, and the cooled ambient air is directly transported from underground to the ring main unit 1, and the probability of its secondary temperature rise by the ambient temperature is lower, making the heat dissipation effect of the ring main unit 1 better.

[0026] At the same time, the setting of the main air duct 41 and a plurality of branch air ducts 42 enables the ambient air flowing in the air inlet duct 4 to have a larger contact area with the cooling medium in the ground-mounted water tank 2, which can significantly improve the cooling effect of the cooling medium in the ground-mounted water tank 2 on the ambient air in the air inlet duct 4. In addition, when the air inlet duct 4 passes through the ground-mounted water tank 2, the ambient air will not come into direct contact with the cooling medium, which directly avoids the possibility of introducing moisture during ventilation and cooling, and has no impact on the dehumidification burden in the ring main unit 1.

[0027] Moreover, since the negative pressure exhaust fan 3 is intermittently started and stopped and / or its rotational speed is increased or decreased by the pulse controller at a set frequency, and a plurality of flexible diameter-changing pipes 51 that can change diameters radially and axially are provided on the main air duct 41, the air flow pressure in the main air duct 41 will change instantaneously when the negative pressure exhaust fan 3 switches its working state. Specifically, when the negative pressure exhaust fan 3 starts or increases its rotational speed, the internal pressure of the flexible diameter-changing pipe 51 decreases, and the flow velocity of the ambient air in the flexible diameter-changing pipe 51 increases, causing the inner diameter of the flexible diameter-changing pipe 51 to shrink; when the negative pressure exhaust fan 3 shuts down or decreases its rotational speed, the internal pressure of the flexible diameter-changing pipe 51 increases, and the flow velocity of the ambient air in the flexible diameter-changing pipe 51 decreases, causing the flexible diameter-changing pipe 51 to return to its original state. Thus, when the flexible diameter-changing pipe 51 changes its diameter following the switching of the working state of the negative pressure exhaust fan 3, on the one hand, it can promote the turbulence effect of the ambient air flowing in the main air duct 41 to improve the heat exchange efficiency between the ambient air and the cooling medium outside the main air duct 41; on the other hand, when the flexible diameter-changing pipe 51 contracts and returns to its original state, it can promote the disturbance and local eddy of the surrounding cooling medium, and thus also improve the heat exchange efficiency between the cooling medium in the buried water tank 2 and the ambient air in the main air duct 41. Thereby, the cooling effect of the buried water tank 2 on the ambient air in the air inlet pipe 4 can be significantly improved, and further the heat dissipation effect of the ring main unit body 1 can be ensured to be enhanced.

[0028] In order to further improve the cooling effect of the buried water tank 2 on the air flow in the air inlet pipe 4, in another feasible embodiment, two buried water tanks 2 can also be arranged in the vertical direction, and a medium-temperature water rising channel and a low-temperature water falling channel are provided between the two buried water tanks 2. By means of the density difference of the cooling medium in the buried water tank 2, automatic stratification of the cooling medium is realized, so that the upper buried water tank 2 is basically filled with medium-temperature cooling medium, and the lower buried water tank 2 is basically filled with low-temperature cooling medium, to reduce the loss of cold and heat mixing and improve the cooling effect on the air flow in the main air duct 41; at this time, the main part of the main air duct 41 and a plurality of branch air ducts 42 should be arranged in the lower buried water tank 2.

[0029] Alternatively, in other feasible embodiments, the above-mentioned flexible diameter-changing pipes 51 can also be provided on the branch air ducts 42, which can also achieve the effect of promoting the turbulence of the ambient air in the branch air ducts 42 and the disturbance and local eddy of the cooling medium; however, in order to avoid causing a greater impact on the load of the negative pressure exhaust fan 3, the length and / or diameter of the flexible diameter-changing pipes 51 on the branch air ducts 42 should be appropriately reduced to ensure the smooth flow of the ambient air in the air inlet pipe 4.

[0030] In consideration of ensuring the stable and smooth flow of ambient air in the air inlet duct 4, in the embodiment of the present application, the part of the main air duct 41 located in the buried water tank 2 is integrally in a "U" shape, and includes two vertical sections 411 and a horizontal section 412. Flexible variable-diameter pipes 51 are distributed on both the vertical section 411 and the horizontal section 412. The branch air duct 42 is used to connect the two vertical sections 411. Specifically, the two ends of the branch air duct 42 are respectively communicated with the two vertical sections 411. Moreover, the branch air duct 42 can be a straight pipe, or can be in the shapes of an arc pipe, a corrugated pipe, a serpentine pipe, etc., which can increase the flow path of the ambient air in the branch air duct 42 to a certain extent and improve the heat exchange efficiency between the ambient air and the cooling medium.

[0031] The diameter of the branch air duct 42 is smaller than that of the main air duct 41, and it is preferably not more than one-third of the diameter of the main air duct 41. And the diameter of the branch air duct 42 gradually increases from top to bottom to avoid the lower branch air duct 42 and the horizontal section 412 having a lower air pressure. Multiple branch air ducts 42 are distributed in a net shape between the two vertical sections 411, and the two intersecting branch air ducts 42 are not communicated at the intersection. On the one hand, it can avoid the occurrence of turbulent flow in the branch air duct 42 and affect the overall fluidity of the ambient air in the air inlet duct 4. On the other hand, it can make multiple branch air ducts 42 present a certain three-dimensional heat dissipation structure in the buried water tank 2 and improve the cooling effect of the cooling medium on the ambient air in the branch air duct 42. And a smooth transition surface is provided at the corner of the connection part between the branch air duct 42 and the main air duct 41 to further reduce the disordered turbulent flow.

[0032] In a specific example, for example, the branch air duct 42 is set as a corrugated pipe with a certain curvature, and the inner arc sides of the two intersecting branch air ducts 42 are arranged relatively, which can make the pipe network composed of multiple branch air ducts 42 present a more three-dimensional spatial structure, enable multiple branch air ducts 42 to contact the low-temperature cooling medium more, and reduce the heat exchange interference between adjacent branch air ducts 42, thereby improving the heat exchange efficiency between the ambient air flowing in the branch air duct 42 and the cooling medium in the buried water tank 2.

[0033] And in order to further improve the disturbance effect of the flexible variable-diameter pipe 51 on the cooling medium during diameter variation, referring to Figure 2 、 Figure 3 and Figure 4, a plurality of spoiler plates 53 are arranged on the fixing frame 52 at intervals with the flexible variable-diameter pipe 51. The spoiler plates 53 can be integrally in the shape of a conical cylinder or a straight cylinder and wrap around the entire outer circumference or part of the flexible variable-diameter pipe 51, or can be arranged in a staggered manner in multiple pieces on the circumferential side or part of the flexible variable-diameter pipe 51. And the spoiler plates 53 can be directly fixedly connected to the fixing frame 52 to directly guide or limit the transmission direction of the disturbed cooling medium; or can be flexibly hinged to the fixing frame 52 through flexible parts such as rubber, so as to further expand the disturbance effect of the highly flexible variable-diameter pipe 51 on the cooling medium when the diameter is changed through the swing of the spoiler plates 53 on the fixing frame 52.

[0034] For example, in a specific example, referring to Figure 2 , Figure 3 and Figure 4 , the spoiler plates 53 on the vertical section 411 are arranged in a staggered and flexible hinged manner on the fixing frame 52 in multiple pieces, and the multiple spoiler plates 53 are integrally enclosed into a conical cylinder with the cone bottom facing up, so that the low-temperature cooling medium located in the lower layer can flow upward by means of the swing of the spoiler plates 53, promoting the circulating convection of the low-temperature cooling medium in the lower layer and the medium-temperature cooling medium in the upper layer in the buried water tank 2, and improving the cooling effect on the ambient air in the air inlet pipe 4. Correspondingly, the spoiler plates 53 located on the horizontal section 412 are fixedly connected to the fixing frame 52 and are only distributed below the flexible variable-diameter pipe 51, and can also promote the circulating flow of the cooling medium in the buried water tank 2 by means of the disturbance during the diameter change of the flexible variable-diameter pipe 51.

[0035] In addition, considering that when the humidity of the external ambient air is relatively high, the cooling air directly introduced into the ring main cabinet body 1 may contain a certain amount of water vapor.

[0036] In another embodiment, referring to Figure 2 and Figure 5 , a condensation tank 61 is connected between the main air duct 41 and the negative pressure exhaust fan 3. The condensation tank 61 is also buried underground and is located above the buried water tank 2. A plurality of condensation plates 62 in the shape of conical cylinders and sleeved in sequence from bottom to top are fixedly connected in the condensation tank 61. Adjacent two condensation plates 62 are arranged at intervals. The cone bottom opening diameters and cone top opening diameters of the plurality of condensation plates 62 from bottom to top both show an increasing trend. A plurality of water guide grooves are arranged on the condensation plates 62 along their conical surfaces.

[0037] The bottom of the condensation tank 61 protrudes downward to form an annular water storage tank 63. The bottom wall of the annular water storage tank 63 is provided with a plurality of weak spring one-way valves 64 that only allow fluid to flow out of the condensation tank 61, so that the condensed water in the annular water storage tank 63 can drain out through the weak spring one-way valves 64 by its own gravity. The cone bottom opening diameter of the lowermost condensation plate 62 is not less than the minimum diameter of the annular water storage tank 63; and the outlet end of the weak spring one-way valve 64 is connected with a drainage pipe to lead the condensed water to the underground soil.

[0038] Thus, after the ambient air is cooled by the main air duct 41 and the branch air ducts 42, it then flows into the condensation tank 61 and passes through the middle of the lowermost condensation plate 62 and the gaps between two adjacent condensation plates 62. This enables the multiple condensation plates 62 to condense the water vapor in the ambient air, forming condensed water droplets that flow along the multiple water guide grooves on the condensation plates 62 into the annular water storage tank 63 for collection. This can greatly reduce the water vapor in the ambient air entering the main body 1 of the ring main unit. Moreover, compared with the drying dehumidification method, this method hardly causes a temperature rise in the ambient air entering the main body 1 of the ring main unit. When the negative pressure exhaust fan 3 stops operating under the control of the pulse controller, the condensed water stored in the annular water storage tank 63 drains out by its own gravity through multiple weak spring one-way valves 64; when the negative pressure exhaust fan 3 is operating, the weak spring one-way valves 64 can prevent external air from entering.

[0039] In addition, referring to Figure 1 and Figure 2 , a plurality of heat conducting fins 21 are fixedly connected to the outer wall of the underground water tank 2 to further improve the heat exchange effect between the underground water tank 2 and the underground soil, and to ensure as much as possible that the cooling medium in the underground water tank 2 is always at a relatively low temperature. One end of the air inlet pipe 4 extending to one side of the main body 1 of the ring main unit is connected to a rainproof air inlet assembly 71. A dustproof member 72 is provided at the air inlet end of the rainproof air inlet assembly 71. The rainproof air inlet assembly 71 can be a U-shaped pipe with an open lower end, or a rainproof cap spacedly installed at the free end of the air inlet pipe 4; the dustproof member 72 is several layers of filter meshes installed at the open end of the free end of the U-shaped pipe or at the free end of the air inlet pipe 4.

[0040] Unless otherwise defined, the technical terms or scientific terms used in this application shall have the ordinary meanings as understood by those of ordinary skill in the art to which this application pertains. The words "first", "second", "third" and similar terms used in the specification and claims of this application do not denote any order, quantity or importance, but are only used to distinguish different components. The words "a" or "an" and the like do not denote a quantity limitation, but rather denote the presence of at least one. The words "comprising" or "including" and the like are intended to mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. The terms "upper", "lower", "left", "right" and the like are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0041] The above are all preferred embodiments of this application. Without restricting the protection scope of this application accordingly, therefore: All equivalent changes made according to the structure, shape and principle of this application shall be covered within the protection scope of this application.

Claims

1. An energy-saving heat dissipation ring main unit, comprising a ring main unit body (1) and an air inlet (11) and an air outlet (12) arranged on the ring main unit body (1), characterized in that: A buried water tank (2) buried 1.5 m below the ground is provided below the ring network cabinet body (1), and the buried water tank (2) is filled with a cooling medium; a negative pressure exhaust fan (3) is also provided on the ring network cabinet body (1), and the air outlet of the negative pressure exhaust fan (3) is connected to the air inlet (11), and the air inlet is connected to an air inlet duct (4), and one end of the air inlet duct (4) passes through the cooling medium in the buried water tank (2), then extends out of the ground and extends to one side of the ring network cabinet body (1); The air inlet duct (4) comprises a main air duct (41) coiled and arranged in the buried water tank (2) and a plurality of branch air ducts (42) used to connect adjacent pipe walls of the main air duct (41), and the main air duct (41) and the branch air ducts (42) are both made of heat-conducting metal material; A plurality of breakouts (413) are provided at intervals on the main air duct (41), and a flexible reducer (51) is sealed and connected to the breakouts (413). The negative pressure exhaust fan (3) is connected to a pulse controller, and the pulse controller is configured to control the negative pressure exhaust fan (3) to start and stop at a set frequency and / or increase or decrease the rotation speed, so that the plurality of flexible reducers (51) change diameter when the negative pressure exhaust fan (3) starts and stops, thereby promoting airflow turbulence in the main air duct (41) and disturbance of the cooling medium in the buried water tank (2).

2. The energy-saving heat dissipation ring network cabinet according to claim 1, characterized in that: The main air duct (41) is fixedly connected at the break (413) with a fixing frame (52) for connecting the tube bodies at both ends of the break (413); the inner hollow size of the fixing frame (52) along the radial direction of the main air duct (41) is larger than the outer diameter of the flexible reducer (51) when the diameter is expanded.

3. The energy-saving heat dissipation ring network cabinet according to claim 2 is characterized in that: The portion of the main air duct (41) located in the buried water tank (2) is in a "U" shape as a whole and comprises two vertical sections (411) and a horizontal section (412). The flexible reducer (51) is distributed on both the vertical section (411) and the horizontal section (412). The branch air duct (42) is used to connect the two vertical sections (411).

4. The energy-saving heat dissipation ring network cabinet according to claim 2 is characterized in that: The diameter of the branch air duct (42) is smaller than the diameter of the main air duct (41); the plurality of branch air ducts (42) are distributed in a network between the two vertical sections (411); and two intersecting branch air ducts (42) are not connected at the intersection.

5. The energy-saving heat dissipation ring network cabinet according to claim 1, characterized in that: A smooth transition surface is provided at the corner of the connecting portion between the branch air duct (42) and the main air duct (41).

6. The energy-saving heat dissipation ring network cabinet according to claim 2, characterized in that: The fixing frame (52) is provided with a plurality of spoilers (53) which are arranged at intervals from the flexible reducer tube (51).

7. An energy-saving heat dissipation ring network cabinet according to any one of claims 1 to 6, characterized in that: A condensation tank (61) is provided between the main air duct (41) and the negative pressure exhaust fan (3), wherein a plurality of condensation plates (62) in a cone-shaped cylinder are fixedly connected to the condensation tank (61) and are arranged in sequence from bottom to top, and an interval is arranged between two adjacent condensation plates (62), and the cone bottom opening diameters and cone top opening diameters of the plurality of condensation plates (62) from bottom to top both tend to increase; An annular water storage groove (63) is provided at the bottom of the condensation tank (61) protruding downward, and a plurality of weak spring one-way valves (64) are provided on the bottom wall of the annular water storage groove (63) for only allowing fluid to flow out of the condensation tank (61).

8. The energy-saving heat dissipation ring network cabinet according to claim 7, characterized in that: The condensation plate (62) is provided with a plurality of water guide grooves arranged along its conical surface.

9. The energy-saving heat dissipation ring network cabinet according to claim 1, characterized in that: A plurality of heat-conducting fins (21) are fixedly connected to the outer wall of the buried water tank (2).

10. The energy-saving heat dissipation ring network cabinet according to claim 1, characterized in that: One end of the air inlet duct (4) extending to one side of the ring main unit body (1) is connected to a rainproof air inlet assembly (71), and a dustproof part (72) is provided at the air inlet end of the rainproof air inlet assembly (71).

Images