KR102292098B1 - Transformer for being laid underground with waterproof function and cooling function - Google Patents

Abstract

It relates to an underground buried transformer having a waterproof function and a cooling function, and the buried box is buried underground in the form of a manhole with the sides and lower surfaces of all directions sealed and the upper surface open, and the buried box covers the open part of the upper surface of the buried box. The cover part that seals the internal space, the transformer part that is located in the internal space of the buried box and converts the AC voltage input from the input cable using electromagnetic induction and outputs it to the output cable, the internal space of the buried box according to the inflow of rainwater Inflow from the outside of the buried box through the air conditioning unit that cools the transformer located in the inner space of the buried box using air introduced from the outside of the buried box by ventilating or sealing the and a cooling unit for cooling the transformer using the cooled cooling water.

Description

Transformer for being laid underground with waterproof function and cooling function}

It relates to a transformer buried underground, and in particular, to an underground buried transformer having a waterproof function and a cooling function.

Conventionally, electrical equipment such as transformers, switchgear, communication devices, etc. are installed on top of large ground facilities such as electric poles, so it is difficult to maintain electrical equipment, such as electric equipment managers having to climb on electric poles and perform maintenance on electric equipment. It was dangerous. In addition, along with the rapid industrialization of modern society, as the demand for electric equipment has exploded, electric equipment-related facilities such as electric poles have appeared all over the city center. As a result, electrical equipment-related facilities such as electric poles have been acting as factors that impair the aesthetics of the city, impede the efficient use of city space, and threaten the safety of city residents.

Recently, a cable underground project in which electric wires connected between these electric equipments are buried underground and electric equipments are installed on road surfaces such as sidewalks is being carried out. However, since the electric equipment is installed on the road surface, it is frequently reported that the electric equipment is submerged or damaged due to the repeated monsoons and typhoons every year. In addition, it is frequently reported that the vehicle collides with electrical equipment due to the driver's carelessness. Flooding or damage to electrical equipment causes fire, electric shock, and explosion, leading to enormous property loss and personal injury.

In Korea Patent Publication No. 0947101, Korean Patent Publication No. 1256985, and Korean Utility Model Publication No. 0443588, there is an underground buried electrical equipment container system that allows such electrical equipment to be installed underground in order to solve these problems. has been disclosed. On the other hand, a high voltage transformer generates a lot of heat due to various causes. However, since the conventional underground buried electric equipment container system does not have a function of cooling electric equipment, there is a limit to installing a high-voltage transformer that generates a lot of heat underground. In addition, when a high-voltage transformer that generates a lot of heat is installed in an underground enclosed space to prevent flooding of the high-voltage transformer, heat is accumulated in the underground enclosed space, so the cooling of the high-voltage transformer consumes a lot of electrical energy. have.

An object of the present invention is to provide an underground buried transformer having a waterproof function to prevent flooding of a transformer installed underground and a cooling function to cool a transformer installed underground with only consumption of very little electric energy. It is not limited to the technical problem as described above, and another technical problem may be derived from the following description.

An underground buried transformer according to an aspect of the present invention includes: a buried box buried underground in the form of a manhole whose upper surface is sealed and the upper surface is closed in all directions; a cover portion covering the open portion of the upper surface of the buried box to seal the inner space of the buried box; It is located in the inner space of the buried box and converts the AC voltage input from the input cable penetrating the wall of the buried box in a sealed state using electromagnetic induction to an output cable that penetrates the wall of the buried box in a sealed state. a transformer that outputs; an air conditioning unit for cooling the transformer located in the inner space of the buried box using air introduced from the outside of the buried box by ventilating or sealing the inner space of the buried box according to the inflow of rainwater; and a cooling unit for cooling the transformer using cooling water introduced from the outside of the buried box through pipes installed inside and outside the buried box.

The cover part ventilates or seals the inner space of the buried box by the air conditioning unit in a sealed state in which the inner space of the buried box is sealed by coupling the periphery of the cover part and the perimeter of the upper surface side open portion of the buried box in a sealed state. It can communicate with the air conditioning unit in a sealed state so that it can be. The air conditioning unit may be mounted on the cover unit to communicate with at least one ventilation port of the cover unit in a sealed state to ventilate or seal the inner space of the buried box according to the inflow of rainwater into the air conditioner unit. a water tank in which the cooling unit is located outside the buried box and stores water cooled by a temperature difference between the inside and outside of the buried box; and a water cooler positioned in the inner space of the buried box and configured to cool the transformer using water introduced from the water tank as the cooling water.

It may further include a control unit for controlling the driving of at least one of the air conditioning unit and the cooling unit according to at least one of whether the internal space of the buried box is sealed and the temperature. The control unit stops the operation of the fan of the air conditioning unit according to whether the inner space of the buried box is sealed, so that the pressure is transformed by natural convection generated due to a temperature difference between the inner space of the buried box and the outer space of the buried box The transformer may be cooled by forced air circulation between the inner space of the buried box and the outer space of the buried box by allowing the sub to be cooled or by driving the fan of the air conditioning unit.

The control unit stops the operation of the fan of the air conditioning unit according to the temperature of the inner space of the buried box, so that the transformation unit by natural convection generated due to a temperature difference between the inner space of the buried box and the outer space of the buried box. Heat in the process of vaporizing the refrigerant by cooling the transformer or by driving the fan of the air conditioning unit to cool the transformer by forced air circulation between the internal space of the buried box and the external space of the buried box, or by driving the cooling unit By absorption, the transformer can be cooled.

Air conditioning unit that cools the transformer located in the internal space of the buried box by ventilating or sealing the internal space of the buried box buried underground according to the inflow of rainwater, and cooling the transformer using cooling water flowing in from the outside of the buried box By employing the cooling unit, it is possible to provide an underground buried transformer having a waterproof function to prevent flooding of the transformer unit by rainwater and a cooling function to cool the transformer unit located in an underground enclosed space with only very little electrical energy consumption. As a result, high-voltage transformers that generate a lot of heat can be installed underground so that the urban environment on the ground can be more pleasant. safety can be guaranteed.

In addition, so that the inner space of the buried box can be ventilated or sealed by only the air conditioning unit in a state in which the inner space of the buried box is sealed by the cover part that covers the open part of the upper surface of the buried box to seal the inner space of the buried box. By doing so, the structure of ventilating or sealing the inner space of the buried box is simple, so that almost no malfunction occurs, and the management of the waterproofing and cooling functions of the underground transformer is very easy.

In addition, since the air conditioning unit is mounted on the cover to communicate with at least one ventilation port of the cover in a sealed state to ventilate or seal the inner space of the buried box according to the inflow of rainwater into the air conditioning unit, a separate space for the installation of the air conditioning unit is provided. Since there is no need to provide it, the size of the underground transformer having a waterproof function and a cooling function can be minimized. Accordingly, the underground transformer having a waterproof function and a cooling function can be easily installed in a city center where various facilities are buried underground.

In addition, by cooling the transformer using water flowing in from a water tank located outside the buried box and cooled by the temperature difference between the inside and outside of the buried box as cooling water, the consumption of electrical energy according to the cooling of the transformer can be reduced. have. Furthermore, by controlling the driving of at least one of the air conditioning unit and the cooling unit according to at least one of whether the inner space of the buried box is sealed and the temperature, the consumption of electric energy according to the cooling of the transformer can be further reduced.

In addition, depending on whether the inner space of the buried box is sealed, the transformer is cooled by natural convection generated due to the temperature difference between the inner space of the buried box and the outer space of the buried box, or the inner space of the buried box and the By allowing the transformer to be cooled by forced air circulation between the external spaces, overheating of each fan and unnecessary power consumption can be prevented.

In addition, according to the temperature of the inner space of the buried box, the transformer is cooled by natural convection generated due to the temperature difference between the inner space of the buried box and the outer space of the buried box, or the inner space of the buried box and the outside of the buried box By allowing the transformer to be cooled by forced air circulation between the spaces or to cool the transformer by heat absorption during the vaporization of the refrigerant, it is possible to minimize the driving time of the cooling unit and rapidly cool the transformer when the transformer is overheated, By maximizing cooling by natural convection, it is possible to minimize power consumption by driving the cooling unit and the air conditioning unit.

1 is an exploded view of an underground buried transformer according to an embodiment of the present invention.
2-3 is a perspective view of the underground buried transformer shown in FIG.
4-5 is a plan view of the underground buried type transformer shown in FIG.
6-7 is a right side view of the underground buried transformer shown in FIG.
8-9 is a rear view of the underground buried transformer shown in FIG.
10-11 are internal views of the underground buried transformer shown in FIG. 1 .
12 is a cross-sectional view of the underground buried transformer shown in FIG.
13 is an assembly view of the device cover 24 shown in FIG. 1 .
14 is an exploded view of the air conditioning unit 3 shown in FIG.
15 is an exploded view of each of the air supply part 33 and the exhaust part 34 shown in FIG. 14 .
16 is an internal view of each of the air supply part 33 and the exhaust part 34 shown in FIG. 14 .
17 is a cross-sectional view of each of the air supply part 33 and the exhaust part 34 shown in FIG. 14 .
18 is a view illustrating an operation of the air conditioning unit 3 shown in FIG. 15 ventilating the inner space of the buried box 1 .
19 is a view illustrating an operation of the air conditioning unit 3 shown in FIG. 15 sealing the inner space of the buried box 1 .

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. When water permeates into electrical equipment such as a transformer, a transformer, and a communication device, the electrical equipment may fail due to electric leakage or the like. In particular, electrical equipment that generates a lot of heat, such as a high voltage transformer and a high voltage switchgear, may deteriorate or fail due to the heat. Embodiments to be described below relate to an underground buried transformer capable of cooling the transformer while preventing rainwater from entering the transformer. Hereinafter, the person who uses or manages the underground transformer will be referred to as "user".

1 is an exploded view of an underground buried transformer according to an embodiment of the present invention. Referring to FIG. 1 , the underground buried transformer according to this embodiment includes a buried box 1 , a cover part 2 , an air conditioning unit 3 , a cooling unit 4 , a control unit 5 , and a transforming unit (transforming unit). unit) 100 as the main configuration. Hereinafter, an assembly process and a connection form between the above-described components will be described with reference to the exploded view shown in FIG. 1 . Meanwhile, the underground transformer according to the present embodiment may further include other additional components in addition to the above-described components, and other additional components may appear in the process of describing the above-described components.

2-3 is a perspective view of the underground buried transformer shown in FIG. 1, FIGS. 4-5 are plan views of the underground buried transformer shown in FIG. 1, and FIGS. 6-7 are the underground buried transformer shown in FIG. is a right side view, and FIGS. 8-9 are rear views of the underground buried transformer shown in FIG. 1 . 2, 4, 6, and 8, all the upper plates 221-224 of the cover part 2, and all the covers 24 and 25 are shown the appearance of the underground buried transformer in a closed state. 3, 5, 7, and 9, the device top plate 222, the auxiliary top plate 224, and the device cover 24 of the cover part 2 are closed, and the air conditioning top plate 221, the entry/exit top plate 223, and the entry/exit The exterior of the underground-buried transformer is shown with the cover 25 open.

The transformer 100 is a device embedded in the underground buried transformer shown in FIGS. 1-9 and is located in the inner space of the underground buried box 1 . The transformer 100 is located in the inner space of the buried box 1 and converts the AC voltage input from the input cable passing through the wall of the buried box 1 in a sealed state using electromagnetic induction to convert the buried box 1 ) through an output cable that passes through the wall in a sealed state. For example, the transformer 100 has a shape of a primary coil through which a current input from an input cable flows, a secondary coil through which an alternating current output through an output cable flows, an iron core around which the primary and secondary coils are wound, and a tank with a closed front. It may be composed of a case that accommodates the coils and the iron core and is filled with insulating oil to insulate the inside.

Since the loss of electrical energy in the voltage conversion process of the transformer 100 is emitted as heat, when the transformer 100 converts a very high voltage, a lot of heat is generated in the process. In this way, since the high-voltage transformer on the ground can be located in the inner space of the buried box 1 buried underground, the high-voltage transformer disappears from the ground, so that the aesthetics of the city center can be improved and the city space can be used more efficiently, It is safe because there is no inconvenience to pedestrians due to facilities, the risk of vehicle accidents, and the risk of ground explosion. The transformer 100 and the external electrical equipment are connected by a power cable passing through the wall of the buried box 1 in a sealed state. 1 and 3 , on the outer surface of the transformer 100 , there are input terminals through which current flows from the external electrical equipment to the transformer 100 and output terminals through which current flows from the transformer 100 to the external electric equipment. are formed 1-9, a sealing member 11 for allowing the power cables connected to these terminals to pass through the lower wall of the buried box 1 in a sealed state is press-fitted into the lower wall of the buried box 1 has been

The buried box 1 is the outermost part in the lateral direction and the downward direction of the underground buried transformer according to this embodiment. In general, the omnidirectional side and lower surfaces are sealed and the upper surface is open in the form of a square box-shaped manhole underground. is buried in The buried box (1) is buried underground so that its upper surface is level with the ground surface and its side and lower surfaces. As shown in FIGS. 1 and 12 , the inner surface of the buried box 1 protrudes from the upper surface of the buried box 1 along the perimeter of the same depth as the side height of the cover part 2 , so that the cover part 2 ) may be installed at the upper end of the interior of the buried box (1) in the form of being seated on the protruding portion of the inner surface of the buried box (1). As shown in Figure 1, the inner space of the buried box (1) is the inner horizontal area of the top of the inner surface of the buried box (1) from the upper surface of the buried box (1) to a certain depth inside the buried box (1) It is formed in a shape larger than the internal horizontal area under the upper side of the side. Due to the shape of the inner space of the buried box (1), a protruding portion in the form of a step is formed on the inner surface of the buried box (1).

In this way, the upper surface of the cover part 2 is also parallel to the ground surface like the upper surface of the buried box 1, so that the safety of pedestrians can be ensured. However, depending on the installation environment or the intention of the installer of the buried box (1), the upper surface of the buried box (1) may be installed higher than or parallel to the ground surface. In particular, the buried box 1 is preferably made of a material having excellent waterproofness and durability, such as concrete, so as to prevent erosion of the electrical equipment therein by underground moisture, water, microorganisms, and the like. However, those of ordinary skill in the art to which this embodiment pertains can understand that the material may be made of other materials than the above-mentioned materials. In addition, when performing the work of burying the buried box (1) underground, it is preferable to compact the ground where the buried box (1) is to be installed so as not to sink the buried box (1).

The cover part 2 is mounted on the protruding part of the inner surface of the buried box 1 and covers the open part of the upper surface of the buried box 1 to seal the inner space of the buried box 1 . As shown in Figures 2-9, the cover portion (2) is located in the uppermost portion of the upper direction of the underground buried transformer according to this embodiment, the upper surface of the cover portion (2) is exposed to the outside Or serve as a driveway. The cover part 2 may be made of a hard material that is not deformed under any conditions while being able to withstand the loads of pedestrians and automobiles. For example, the cover part 2 may be made of metal, reinforced plastic, or the like. In addition, the cover part 2 may be manufactured in the form of a box in which blocks used for the peripheral sidewalk, etc. can be mounted in order to harmonize with the surrounding sidewalk.

In more detail, the cover part 2 is an air conditioning unit in a sealed state in the inner space of the buried box 1 by coupling the periphery of the cover part 2 and the perimeter of the upper surface side open portion of the buried box in a sealed state. (3) communicates with the air conditioning unit (3) in a sealed state so that the inner space of the buried box (1) can be ventilated or sealed. The cover part 2 communicates with the air conditioning part 3 in a sealed state, so that when there is no possibility of rainwater infiltrating into the transforming part 100 for heat dissipation of the transforming part 100 , that is, the internal space of the buried box 1 . As a result, it is possible to ventilate the inner space of the buried box (1) when there is no possibility of rainwater inflow. As described above, since the internal space of the buried box 1 can be ventilated or sealed by only the air conditioning unit 3, the structure for ventilating or sealing the internal space of the buried box 1 is simple, so that almost no malfunction occurs. Not only that, it is very easy to manage the waterproof function and cooling function of the underground transformer. Referring to FIG. 1 , the cover part 2 includes a cover frame 21 , a top plate 22 , a cover holder 23 , a device cover 24 , an access cover 25 , and a support 26 .

10-11 are internal views of the underground buried transformer shown in FIG. 1 , and FIG. 12 is a cross-sectional view of the underground buried transformer shown in FIG. 1 . 10 shows the inside of the underground buried type transformer in a direction looking down from the top with the buried box 1 removed, and FIG. 11 shows the underground buried type in the direction looking up from the bottom with the buried box 1 removed. The inside of the transformer is shown. 12 shows a cross-section at right angles to a line crossing the center of the exhaust part 34 of the air conditioner 3 in the longitudinal direction of the cover part 2 . Referring to FIGS. 10-12 , it can be easily understood how certain components are arranged in the inner space of the buried box 1 shown in FIG. 1 .

Comparing FIGS. 2-9 showing the exterior of the underground buried transformer shown in FIG. 1 and FIG. 10-12 showing the inside thereof, the inner space of the buried box 1 under the cover part 2 The transformer 100, the fan 35 of the air conditioning unit 3, the water cooler 42 of the cooling unit 4, and the control unit 5 are arranged as shown in FIGS. 10-12. . In addition, in the inner space of the buried box (1) under the cover part (2), a water cooler ( 42), the water cooler frame 71 of the same shape as the edge line, and a footrest ( 72), a ladder 73 that the user can ride down or climb is arranged as shown in FIGS. 10-12. The water cooler frame 71 forms a staircase together with the footrest 72 so that the user can more easily enter the inner space of the buried box 1 .

In particular, as shown in FIG. 11 , a drain pump 6 is installed on the bottom surface of the inner space of the buried box 1 . In the drainage pump 6, rainwater flows into the inside of the buried box 1 due to a failure of the air conditioning unit 3 of the underground buried transformer, etc. When it rises above the water level, water accumulated on the bottom surface of the inner space of the buried box (1) is stored in the bottom surface of the inner space of the buried box (1) until the water level drops below the critical water level. discharged to the outside of Accordingly, even if rainwater flows into the buried box 1 due to a failure of the air conditioning unit 3 of the underground buried transformer, flooding of the transformer 100 can be prevented. When the water in the inner space of the buried box (1) is discharged below the buried box (1), the buried box (1) may be submerged due to submersion of the soil under the buried box (1). The water in the space is preferably discharged to the ground by a drain pump (6).

The cover frame 21 protects the buried box 1 while securing pedestrian safety by covering the upper end of the buried box 1 while its upper surface is level with the ground surface. As shown in FIGS. 10 and 11 , the cover frame 21 is in the shape of a rectangular frame in which a groove of the same shape as the upper end of the buried box 1 is formed, and the cover frame 21 is embedded in the groove of the box (1). Covers the upper end of the buried box (1) in the form that the upper end of the fit. The buried box 1 may be made of a material with a high possibility of erosion of its surface by physical or chemical weathering by an external environment, such as concrete. The cover frame 21 serves to protect the upper surface of the buried box 1 by blocking it from the outside.

On the other hand, the upper plate 22 is a member that is moved or rotated by the user, and since it is made thin to reduce its weight, the edge of the upper plate 22 is sharp and is the most easily damaged when a certain impact is applied. The cover frame 21 serves to protect the top plate 22 by accommodating the top plate 22 so that the edges of the top plate 22 are not exposed. As shown in Figures 1-4, the edge of the top plate 22 is rounded to improve the rigidity of the top plate 22 and at the same time to protect the user. Accordingly, the inner edge of the cover frame 21 is also rounded to accommodate the top plate 22 , and the cover holder 23 whose upper end is in contact with the inner lower end of the cover frame 21 also has rounded corners. It is processed, and the edge of the upper end of the inner surface of the buried box (1) in contact with the outer surface of the cover holder (23) is also rounded.

The top plate 22 protects the upper components by covering the upper components such as the air conditioning unit 3 mounted on the cover holder 23 , the device cover 24 , and the access cover 25 while being level with the ground surface. The top plate 22 is located in the uppermost portion of the cover part 2 together with the cover frame 21 , and the top surface of the top plate 22 is exposed to the outside to serve as a sidewalk or roadway. The upper plate 22 may be opened and closed in a form that can be completely separated from the cover holder 23 , or one side of the top plate 22 is rotatably coupled to the cover holder 23 and can be opened and closed in a form that can be rotated. The top plate 22 may be manufactured as a single integrated plate, but by being divided into a plurality of plates, the weight that a user must handle can be reduced, and a general commercial panel such as a multilayer plate can be used as the top plate 22, thereby reducing the manufacturing cost. can be

Referring to FIG. 1 , the top plate 22 includes an air conditioning top plate 221 , a device top plate 222 , an entry/exit top plate 223 , and an auxiliary top plate 224 . The device top plate 222 and the auxiliary top plate 224 are opened only when the transformer 100 is installed, but the air conditioning top plate 221 can be opened and closed by the user at any time for inspection or replacement of the air conditioning unit 3, Similarly, the upper plate 223 may be opened and closed by a user at any time to check the transformer 100 , the water cooler 42 , etc. located in the inner space of the buried box 1 . In consideration of the opening and closing frequency of each top plate and reduction of manufacturing cost, the device top plate 222 and the auxiliary top plate 224 are opened and closed in a manner that is lifted or put down by the user, and the air conditioning top plate 221 and the access top plate 223 ) can be opened and closed only by rotation by the user. When the air conditioning top plate 221 and the access top plate 223 are opened and closed in such a way that they are lifted or put down by the user, not only may it cause inconvenience to the user, but also the risk of accidents and damage to the top plate 22 is high. .

The air conditioning top plate 221 protects the air conditioning unit 3 by covering the air conditioning unit 3 while being level with the ground surface. Since the inner space of the buried box 1 must be ventilated by the air conditioning unit 3 covered by the air conditioning top plate 221 , the air conditioning top plate 221 covers the air conditioning unit 3 in an unsealed state. In order to be more smoothly ventilated through the air conditioning top plate 221 , a plurality of straight-type ventilation holes as shown in FIGS. 1-4 are formed in the air conditioning top plate 221 . As shown in FIGS. 3 and 10-12 , the air conditioning top plate 221 is in the shape of a square plate, and one side is rotatably coupled to the cover holder 23 and rotates about the rotatably coupled portion as an axis to control the air conditioning unit 3 . cover or expose

One lower surface of the air conditioning top plate 221 and the cover holder 23 may be rotationally coupled by a rotation coupling element such as a hinge. As shown in FIGS. 3 and 10 , one side of the lower surface of the air conditioning top plate 221 and the cover holder 23 are rotationally coupled to each other by two hinges. The air conditioning top plate 221 is rotatable by the user using the rotation coupling element as an axis. The air conditioning top plate 221 uses one side of its lower surface and the rotational coupling portion of the cover holder 23 as an axis, and the other side of the air conditioning unit ( 3) It is possible to cover the air conditioning unit 3 by rotating in the direction. In addition, the air conditioning top plate 221 can be rotated in the opposite direction to the air conditioning unit 3 by the user until the lower surface thereof is separated from the upper surface of the air conditioning unit 3 and stands upright to completely expose the air conditioning unit 3 have.

3 and 10-12, between the air conditioning top plate 221 and the cover holder 23, to rotate the air conditioning top plate 221, an aid for increasing the user's attractive force acting on the air conditioning top plate 221 A device, for example a gas spring, may be installed. The gas spring is a kind of spring using compressed gas. The high-pressure gas spring contains a very large amount of energy, and this energy is used to increase the user's attractive force. As such an assisting device is installed between the air conditioning top plate 221 and the cover holder 23, the user's manpower required for rotation of the air conditioning top plate 221 can be reduced, and the air conditioning top plate 221 caused by the user's mistake. ) and the risk of damage due to a collision between the cover holder 23 is also eliminated.

The device top plate 222 protects the device cover 24 by covering the device cover 24 while being level with the ground surface. As shown in FIGS. 1-9 , the device top plate 222 is mounted on the device cover 24 in the shape of a square panel having two rod-shaped supports to cover the device cover 24 . The device top plate 222 may be separated from the device cover 24 by a user and moved to another location, thereby exposing the device cover 24 . Since the device top plate 222 has the shape of a rectangular panel, a general commercial panel such as a multilayer plate may be used as the top plate 22 .

The access top plate 223 protects the access cover 25 by covering the access cover 25 while being level with the ground surface. As shown in FIGS. 1-10 , the entry/exit top plate 223 is a rectangular flat plate, one side of which is rotationally coupled to the cover holder 23 and rotates about the rotationally coupled portion as an axis to cover or expose the entry/exit cover 25 . make it One side of the lower surface of the entry/exit top plate 223 and the cover holder 23 may be rotationally coupled to each other by a rotation coupling element such as a hinge. As shown in FIGS. 3 and 10-12 , one side of the lower surface of the entry/exit top plate 223 and the cover holder 23 are rotationally coupled to each other by two hinges. The entry/exit top plate 223 is rotatable by the user using the rotation coupling element as an axis.

The entry/exit top plate 223 uses one side of the lower surface and the rotational coupling portion of the cover holder 23 as an axis, and the other side is moved by the user until the lower surface is in close contact with the upper surface of the access cover 25 and becomes horizontal. 25), it is possible to cover the access cover 25 by rotating in the direction. In addition, the access top plate 223 is rotated in the opposite direction to the access cover 25 by the user until the lower surface is separated from the upper surface of the access cover 25 and stands upright to completely expose the access cover 25. have. As shown in FIGS. 3 and 10-12 , a gas for increasing the user's attractive force acting on the entry/exit top plate 223 in order to rotate the entry/exit top plate 223 between the entry/exit top plate 223 and the cover holder 23 . A spring may be installed.

The auxiliary top plate 224 is a trapezoidal-shaped panel inserted between the device top plate 222 and the cover frame 21 and mounted on the device cover 24 . Since the shape of the device top plate 222 is different from the shape of the device cover 24, a space is generated between the device top plate 222 and the cover frame 21, and the auxiliary top plate 224 is installed to fill this space. (24) is mounted. The auxiliary top plate 224 may be separated from the device cover 24 together with the device top plate 222 and moved to another location.

The cover holder 23 is inserted in close contact with the upper end of the inner surface of the buried box 1 and seated and coupled in a sealed state to the protruding portion below the upper end of the inner surface of the buried box 1, and at least one ventilation opening; It is a rectangular box-shaped frame in which one appliance opening and one entrance opening are formed. Here, the ventilation port refers to at least one opening of a size through which the air ventilated through the air conditioning unit 3 can pass, and in this embodiment, the supply port and the exhaust port exist separately for forced air circulation by the fan 35 . do. The device refers to an opening of a size through which the transformer 100 can pass, through which the transformer 100 is moved from the outside of the underground buried transformer to the inside of the underground embedded transformer, and the inner space of the buried box 1 can be installed on The doorway refers to an opening of a size that a user can enter and exit, and through this, the user enters the inside of the buried box 1 and uses the transformer 100, the water cooler 42, etc. located in the inner space of the buried box 1 can be inspected or repaired.

As shown in Fig. 1, the cover holder 23 is formed with a "T" That is, the cover holder 23 is a vertical frame in close contact with the upper end of the inner surface of the buried box (1), the outer surface of which is coupled in a sealed state to the protruding portion below the upper end of the inner surface of the buried box (1). It is composed of a horizontal frame, and a "T"-shaped bulkhead dividing the inside of the cover holder 23 into three zones. The vertical frame, the horizontal frame, and the partition wall may be integrally molded or manufactured separately and then welded together. On the other hand, since the three ends of the "T"-shaped bulkhead are only coupled to the inner surface of the vertical frame, the "T"-shaped bulkhead is prone to bending when a certain load is applied to the "T"-shaped bulkhead. The support 26 is an H-shaped steel of the same shape as the "T"-shaped bulkhead, and each of the three ends is inserted into the groove of the protruding part below the upper end of the inner surface of the buried box 1 to insert the "T" of the cover holder 23. "I support my brother's bulkhead.

A ventilation hole is formed in the horizontal frame of any one of the three zones of the cover holder 23, an appliance is formed in the horizontal frame of the other zone, and a doorway is formed in the horizontal frame of the other zone has been Hereinafter, the area in which the ventilation hole is formed may be referred to as an "air conditioning area", the area in which the appliance is formed may be referred to as an "equipment area", and the area in which the entrance or exit is formed may be referred to as an "entrance area". The mechanism of the cover holder 23 is rarely opened except when the underground transformer is first installed and the transformer 100 is replaced.

On the other hand, the air conditioning unit 3 should be replaced more frequently than the transformer 100 because the air conditioning performance may be deteriorated in proportion to the period of use due to dust or the like. Accordingly, the ventilation hole of the cover holder 23 can be opened more frequently than the appliance mechanism. The doorway of the cover holder 23 may be opened more frequently than the appliance and the ventilation hole for regular inspection of the transformer 100 and the water cooler 42 . In addition, the manager of the transformer 100 and the manager of the underground transformer shown in FIG. 1 may be different from each other. In this embodiment, as described above, by dividing the inside of the cover holder 23 into three zones, it is possible to take an opening/closing method suitable for the characteristics of each of the different types of openings formed in the cover holder 23 . Instead, each zone can be managed by different managers. For example, by installing a security device such as a lock on each of the air conditioning top plate 221 and the access top plate 223, it can be managed by different managers.

That is, since the device of the cover holder 23 hardly needs to be opened except when the underground transformer is first installed and the transformer 100 is replaced, the device top plate 222 and the device cover 24 covering it are It opens and closes by lifting or lowering by the user. On the other hand, since the ventilation hole and the doorway of the cover holder 23 can be opened and closed by the user at any time, the air conditioning top plate 221 , the entry top plate 223 , and the entry cover 25 covering them are heavy like the device cover 24 . In the case of opening and closing the doorway of the cover holder 23 by lifting or lowering the cover 25, it may cause inconvenience to the user as well as the risk of accidents for the user and the cover holder 23, access cover 25, etc. There is a high risk of damage to components. In this embodiment, in order to solve this problem, the ventilation hole and the doorway of the cover holder 23 can be opened and closed only by the user rotating the air conditioning top plate 221 , the entry top plate 223 , and the entry cover 25 .

The device cover 24 is mounted on the cover holder 23 to cover the device mechanism of the cover holder 23 in a sealed state. 1 and 12 , the instrument cover 24 is mounted on the horizontal frame of the instrument section of the cover holder 23 and sealedly coupled with the horizontal frame of the instrument section of the cover holder 23 to thereby cover the cover holder 23 . cover the instrument in a sealed state. More specifically, the device cover 24 has the same flat plate shape as the horizontal plane shape of the device section of the cover holder 23 , that is, the shape of a square plate, and its lower surface forms the circumferential surface of the device device of the cover holder 23 . By being coupled to the upper surface of the horizontal frame in a sealed state, it is possible to cover the mechanism of the cover holder 23 in a sealed state. Like the device top plate 222 , the device cover 24 may be separated from the cover holder 23 by the user and moved to another location, thereby exposing the transformer 100 .

13 is an assembly view of the device cover 24 shown in FIG. 1 . Referring to FIG. 13 , the process of assembling the device cover 24 in order to install the transformer 100 in the inner space of the buried box 1 is as follows. Put down the transforming unit 100 through the mechanism of the cover holder 23 and place it in the inner space of the buried box (1). Next, the device cover 24 is sealedly coupled to the peripheral surface of the device mechanism of the cover holder 23 . Next, the top plate 22 and the auxiliary top plate 224 are mounted on the device cover 24 . The transformer 100 located in the inner space of the buried box 1 needs to be moved to the outside of the underground buried transformer for replacement. If the above process is performed in reverse, the transformer 100 may be moved to the outside of the underground buried transformer. That is, the upper plate 22 and the auxiliary upper plate 224 are lifted from the device cover 24 and moved to the outside of the cover holder 23 . Next, the device cover 24 is separated from the peripheral surface of the device of the cover holder 23 and moved to the outside of the cover holder 23 . Then, the transformer 100 is lifted through the mechanism of the cover holder 23 and moved to the outside of the underground buried transformer.

Nut-shaped grooves are formed in the protruding portion of the inner surface of the buried box 1 , and holes corresponding to the grooves of the buried box 1 are formed in the device cover 24 and the cover holder 23 . After passing the bolt through each of the holes of the device cover 24 and the cover holder 23, the cover holder 23 is attached to the protruding portion of the inner surface of the buried box 1 by fastening it to each of the grooves of the buried box 1. The device cover 24 may be coupled to the circumferential surface of the device of the cover holder 23 at the same time as being coupled. The buried box ( The protruding portion of the inner surface of 1) and the cover holder 23 may be coupled in a sealed state, and the peripheral surface of the device of the cover holder 23 and the device cover 24 may be coupled in a sealed state.

The access cover 25 is mounted on the cover holder 23 to cover the entrance and exit of the cover holder 23 in a sealed state. 1, 3, and 10, the access cover 25 is mounted on the horizontal frame of the access area of the cover holder 23 and is sealedly coupled with the horizontal frame of the access area of the cover holder 23, whereby the cover holder ( 23) cover the doorway in a sealed state. More specifically, the access cover 25 has the same flat plate shape as the horizontal plane shape of the device area of the cover holder 23, that is, one side is rotationally coupled to the cover holder 23 in the shape of a square plate. By rotating about the part as an axis, the entrance or exit of the cover holder 23 is covered or opened in a sealed state. As such, since the doorway of the cover holder 23 is opened and closed by the rotation of the access cover 25 , it cannot be coupled with the cover holder 23 in a sealed state by fastening the bolts applied to the device cover 24 .

In order for the cover holder 23 and the access cover 25 to be sealedly coupled by the rotation of the access cover 25, the perimeter of the doorway of the cover holder 23 is extended by a predetermined length and protrudes in a form that is bent upward. There is a waterproof band attached to the lower surface of the access cover 25 to cover the entire protruding portion around the doorway of the cover holder 23 . The waterproof band may be made of a material having elasticity, such as rubber or silicone. When the waterproof band attached to the lower surface of the access cover 25 is pressed by the protruding portion around the doorway of the cover holder 23, the gap between the protruding portion around the doorway of the cover holder 23 and the access cover 25 is sealed One lower surface of the access cover 25 and the upper surface of the horizontal frame of the access area of the cover holder 23 may be rotationally coupled to each other by a rotation coupling element such as a hinge. 3 and 10 , one lower surface of the access cover 25 and the upper surface of the horizontal frame of the access area of the cover holder 23 are rotationally coupled by two hinges. The access cover 25 is rotatable by a user using this rotational coupling element as an axis.

The access cover 25 has one side of the lower surface and a waterproof band attached to the lower surface of the upper surface of the horizontal frame of the access area of the cover holder 23 as an axis, and a waterproof band attached to the lower surface protrudes around the doorway of the cover holder 23 . As the other side is rotated in the direction of the doorway by the user until it is pressed in close contact with the site, the doorway of the cover holder 23 can be covered in a sealed state. In addition, the access cover 25 is rotated in the opposite direction to the doorway direction by the user until the waterproof band attached to the lower surface is separated from the protruding portion around the doorway of the cover holder 23 and stands upright, the cover holder 23 can be fully opened. 3 and 10, between the access cover 25 and the cover holder 23, there is a gas spring for increasing the user's attractive force acting on the access cover 25 to rotate the access cover 25. can be installed.

The bonding portion of the buried box 1 and the cover holder 23 is sealed, and the ventilation hole is shielded by the air conditioning unit 3 in a state where the bonding portion between the cover holder 23 and the device cover 24 is sealed, When the entrance is blocked by the cover 25, the inner space of the buried box (1) is sealed. As such, when the inner space of the buried box 1 is sealed, rainwater cannot penetrate into the transformer 100 located in the inner space of the buried box 1 even during rain. Since the ventilation hole of the cover holder 23 is automatically opened and closed according to the inflow of rainwater by the air conditioning unit 3 , the air conditioning top plate 221 does not need to cover the air conditioning unit 3 in a sealed state. On the other hand, as described above, in order to prevent the inflow of rainwater into the appliance of the cover holder 23 and the entrance, the appliance cover 24 must cover the appliance of the cover holder 23 in a sealed state, and the access cover 25 is The doorway of the cover holder 23 should be covered.

The air conditioning unit 3 is located in the inner space of the buried box 1 using air introduced from the outside of the buried box 1 by ventilating or sealing the inner space of the buried box 1 according to the inflow of rainwater. The transformer 100 is cooled. The air conditioning unit 3 is mounted on the cover unit 2 so as to communicate in a sealed state with at least one ventilation port of the cover unit 2 , and according to the inflow of rainwater into the air conditioning unit 3 , the inner space of the buried box 1 . Ventilate or seal. Accordingly, there is no need to provide a separate space for the installation of the air conditioning unit 3, so that the size of the underground transformer having a waterproof function and a cooling function can be minimized. Accordingly, the underground transformer having a waterproof function and a cooling function can be easily installed in a city center where various facilities are buried underground.

1, 3, 5, 10-12, the air conditioning unit 3 is mounted on the cover holder 23 so as to communicate with at least one ventilation hole of the cover holder 23 in a sealed state, and the air conditioning unit 3 ) to ventilate or seal the internal space of the buried box (1) according to the inflow of rainwater. More specifically, the air conditioning unit 3 is mounted on the horizontal frame of the air conditioning zone of the cover holder 23 and is sealedly coupled to the circumferential surface of at least one ventilation hole of the cover holder 23 to thereby cover the cover holder 23 . It communicates in a sealed state with at least one vent of the air conditioner 3 , and may ventilate or seal the inner space of the buried box 1 according to the inflow of rainwater into the air conditioning unit 3 . The air conditioning unit 3 may be made of a hard material that is not rusted by water. For example, the air conditioning unit 3 may be made of stainless steel, aluminum alloy, reinforced plastic, or the like.

In particular, in the present embodiment, the air conditioning unit 3 allows air to flow through at least one ventilation pipe of the air conditioning unit 3 according to the inflow of rainwater into the air conditioning unit 3 or prevents the flow of the buried box (1). Ventilate or seal the interior space of On the other hand, the air conditioning unit 3 may ventilate or seal the inner space of the buried box 1 according to the inflow of rainwater using a single ventilation pipe. However, when air circulates between the inside and the outside of the buried box 1 through one ventilation pipe, the flow of air flowing into the ventilation pipe and the flow of air flowing out from the ventilation pipe may collide with each other, so the buried box 1 ), the air circulation between the internal space and the external space may not be smooth. In particular, the air conditioner 3 may forcibly circulate air between the inside and the outside of the buried box 1 using the fan 35 according to the temperature of the inner space of the buried box 1 .

In order to enable forced air circulation while allowing air circulation between the inner space and the outer space of the buried box 1 more smoothly, in this embodiment, the buried box 1 from the outer space of the buried box 1 The air supply side allowing air to flow into the inner space and the exhaust side allowing air to flow out from the inner space of the buried box 1 to the outer space of the buried box 1 are separated and configured, and the inner space of the buried box 1 The temperature and humidity of the room can be maintained almost the same as that of the outside. Accordingly, at least one ventilation port of the cover holder 23 is an air supply port through which air flows into the inner space of the buried box 1 from the outer space of the buried box 1 and the buried box from the inner space of the buried box 1 . (1) is configured to be separated by an exhaust port through which air flows out into the external space, and at least one ventilation pipe of the air conditioning unit (3) is air flowing into the internal space of the buried box (1) from the external space of the buried box (1). may be configured to be separated into an air supply pipe through which air flows and an exhaust pipe through which air flowing out from the internal space of the buried box 1 to the external space of the buried box 1 flows.

14 is an exploded view of the air conditioning unit 3 shown in FIG. 1 and 14 , the air conditioning unit 3 includes a housing 31 , a filter 32 , an air supply unit 33 , an exhaust unit 34 , and a fan 35 . Hereinafter, an assembly process and a connection form between the above-described components will be described with reference to the exploded view shown in FIG. 14 . Only the components installed on the cover holder 23 are shown in FIG. 14 , and the fan 35 installed under the cover holder 23 is omitted. The housing 31 is mounted on the cover holder 23 and covers the air supply part 33 and the exhaust part 34 in an unsealed state to protect the air supply part 33 and the exhaust part 34 while protecting only a part of the plurality of holes. It is possible to control the inflow rate of water into the air supply part 33 and the exhaust part 34 at the same time to be able to be ventilated more smoothly. 1 , 10 and 12 , the housing 31 is mounted on the horizontal frame of the air conditioning zone of the cover holder 23 to cover the air supply part 33 and the exhaust part 34 in an unsealed state. In more detail, the housing 31 has a plurality of holes formed on only some of the four sides, the other two sides and the upper surface are closed, and the lower surface is an open square box in the shape of an air supply unit ( 33) and the exhaust portion 34 are coupled to the horizontal frame of the air conditioning zone of the cover holder 23 to be located.

As shown in FIG. 14 , a plurality of coupling pieces used for coupling with the cover holder 23 are formed at the lower end of the side of the housing 31 . Nut-shaped grooves are formed in the horizontal frame of the air conditioning zone of the cover holder 23, and holes corresponding to the grooves of the horizontal frame of the air conditioning zone of the cover holder 23 are formed in the coupling pieces of the housing 31. have. The housing 31 in the horizontal frame of the air conditioning region of the cover holder 23 by fastening the bolts to each of the grooves of the horizontal frame of the air conditioning region of the cover holder 23 after passing the bolt through each of the holes of the coupling pieces of the housing 31 can be combined. In order to allow for smoother ventilation through the housing 31 and at the same time control the rate of inflow of water into the air supply 33 and the exhaust unit 34, some or all of the four sides of the housing 31 are circular. It may be a porous surface in which a plurality of ventilation holes are formed. According to the present embodiment, two of the four side surfaces of the housing 31 facing each other are porous surfaces.

The filter 32 is attached to the outside or inside of the porous surface of the housing 31 to filter substances other than air and water from the substances flowing into the air conditioning unit 3 . The filter 32 is composed of a filter net in the form of a square plate through which air and water can enter and exit and a square frame in the form of enclosing the filter net. The filter net is press-fitted into this rectangular frame, so that the filter net is fixed. The filter net may be made of a textile material. Since the housing 31 is generally made of a metal material, it is difficult to process and cannot be frequently replaced so that holes are formed through which only air passes and fine substances such as dust, soil erosion, etc. cannot pass. By filtering out these fine substances, the filter 32 can not only prevent clogging of the air conditioner 3 due to the deposition of such fine substances, but also can be replaced frequently.

15 is an exploded view of each of the air supply unit 33 and the exhaust unit 34 shown in FIG. 14, and FIG. 16 is an internal view of each of the air supply unit 33 and the exhaust unit 34 shown in FIG. 14, FIG. 17 is a cross-sectional view of each of the air supply part 33 and the exhaust part 34 shown in FIG. 14 . 16 shows the inside of the air supply part 33 in a direction looking down from the top in a state in which the air supply duct 331 is removed, and in FIG. The cross section is shown at right angles to the transverse line. In this embodiment, since the air supply part 33 and the exhaust part 34 have the same configuration, each of them is integrated and shown in one figure. Referring to FIG. 15 , the air supply unit 33 includes an air supply duct 331 , a piping gasket 332 , an air supply pipe 333 , two guide members 334 , two sealing packings 335 , and two floating bodies. 336 , and two supply air perforated pipes 337 . Hereinafter, an assembly process and a connection form between the above-described components will be described with reference to the exploded view shown in FIG. 15 .

The two guide members 334, the two sealing packings 335, the two floating bodies 336, and the two air supply porous pipes 337 are formed when the air supply part 33 shown in FIG. 14 exceeds the critical water level. These are elements for allowing or preventing air from flowing through the air supply pipe 333 depending on whether it is submerged in water at a height. As will be understood from the description below, the air supply pipe 333 using one guide member 334 , one sealing packing 335 , one floating body 336 , and one air supply perforated pipe 337 . ) to allow air to flow through it or to prevent it from flowing through it. However, due to the adoption of a structure for allowing air to flow through the air supply pipe 333 or not to flow, the ventilation ability through these elements is inferior to the ventilation ability of the air supply pipe 333 .

In this embodiment, in order to maintain the ventilation capacity of the air supply pipe 333, two guide members 334, two sealing packings 335, two floating bodies 336, and two air supply perforated pipes 337 are provided. used One of the guide members 334, one sealing packing 335, one wound to allow or prevent air from flowing through the air supply pipe 333 to those of ordinary skill in the art to which this embodiment belongs The sieve 336, and one air perforated pipe 337 may be used, and a larger number of guide members 334, sealing packing 335, floating body 336, and supply air perforated pipe 337 may be used. can understand that

The air supply duct 331 is connected between the upper end of the air supply pipe 333 and the upper end of the at least one air supply perforated pipe 337 so that the air supply pipe 333 and the at least one air supply perforated pipe 337 communicate with each other. 15 and 17, the air supply duct 331 has the shape of a square box in which the side and the upper surface of the front direction are sealed and three openings are formed on the lower surface, and one of the three openings on the lower surface of the air supply duct 331 The upper end of one air supply pipe 333 is coupled in a sealed state to the circumferential surface of the openings, so that the upper end of the air supply pipe 333 is connected and the upper ends of the two air supply porous pipes 337 are connected to the circumferential surfaces of the two openings at both ends. By being coupled one-to-one, it may be connected to the upper end of the two air supply porous pipes 337 . Referring to FIG. 15 , the air supply duct 331 includes a duct upper plate 3311 , a duct gasket 3312 , and a duct lower plate 3313 .

The duct upper plate 3311 is coupled to the lower duct plate 3313 in the shape of a square box in which the side and upper surfaces of the duct are closed and the lower surface is open. The duct gasket 3312 is inserted between the duct upper plate 3311 and the duct lower plate 3313 in the shape of a square frame in which four straight frames are connected at right angles to seal the gap between the duct upper plate 3311 and the duct lower plate 3313 . make it The lower duct plate 3313 is in the shape of a square plate in which three circular openings are arranged in a longitudinal direction, the upper surface is coupled to the lower end of the duct upper plate 3311, and one circular opening in the center of the three circular openings The upper ends of one air supply pipe 333 are sealed to the circumferential surface of the , and the upper ends of the two air supply porous pipes 337 are in close contact with the circumferential surface of the two circular openings at both ends.

On the periphery of the lower end of the duct upper plate 3311 is formed a coupling piece that is bent outward from the lower end of the duct upper plate 3311 and extends to a certain length. As shown in FIGS. 15-17 , a plurality of holes are formed at positions corresponding to each other in the coupling piece of the duct upper plate 3311 , the duct gasket 3312 , and the duct lower plate 3313 . After passing the bolt through each of the holes of the coupling piece of the duct upper plate 3311, the duct gasket 3312, and the lower duct plate 3313 in turn, the duct upper plate 3311, the duct gasket 3312, and the duct are fastened with a nut. The lower plate 3313 may be coupled. Accordingly, the duct upper plate 3311 and the duct lower plate 3313 may be coupled in a sealed state with a gap therebetween.

In this way, since the upper end of the air supply pipe 333 is coupled in a sealed state to the three openings of the lower surface of the air supply duct 331 in the shape of a square box, and the upper end of the two air supply porous pipes 337 are coupled, FIG. 15- Rainwater falling to the air conditioning unit 3 shown in Fig. 17 cannot directly flow into the air supply pipe 333, but flows after colliding with the sealed upper surface of the air supply duct 331 and flows through the hole in the lower part of each air supply pipe 337. It is introduced into the fields or is directly introduced into the holes in the lower part of each air supply perforated pipe 337 . 15-17, since the upper part of each air supply perforated pipe 337 is covered by the air supply duct 331, rainwater cannot flow into the holes at the upper part of each air perforated pipe 337. Therefore, in order for rainwater to flow into the air supply pipe 333 , rainwater flows into the holes at the bottom of each air supply porous pipe 337 , and supplies air through the connection portion of each air supply porous pipe 337 and the air supply duct 331 . It should pass through the inner space of the duct (331). Since the inner space of the air supply duct 331 is located higher than the lower portion of each air supply perforated pipe 337 , rainwater introduced into the lower holes of each air perforated pipe 337 flows into the inner space of the air supply duct 331 . hard to be As a result, it is difficult for rainwater falling to the air conditioning unit 3 shown in FIGS. 15-17 to flow into the air supply pipe 333 .

The piping gasket 332 is inserted between the upper end of the air supply pipe 333 and the peripheral surface of the central opening of the air supply duct 331 in the shape of a square plate having a circular opening formed in the center thereof, The gap between the peripheral surface of the central opening and the upper end of the air supply pipe 333 is sealed. 1 and 3 , a plurality of holes are formed around the opening of the piping gasket 332 . Correspondingly, on the periphery of the upper end of the air supply pipe 333, a coupling piece having the same shape as the piping gasket 332 extending outwardly bent at a right angle from the upper end of the air supply pipe 333 is formed. A plurality of holes are formed at positions corresponding to the air supply duct 331 , the pipe gasket 332 , and the upper coupling piece of the air supply pipe 333 . After passing the bolt through each of the holes of the upper coupling piece of the air supply duct 331, the piping gasket 332, and the air supply pipe 333 in turn, by fastening with a nut, the air supply duct 331, the piping gasket 332, and the supply The upper engaging piece of the organ 333 may be engaged. Accordingly, the air supply duct 331 and the air supply pipe 333 may be coupled in a sealed state between the gap.

The air supply pipe 333 is coupled in a sealed state to the circumferential surface of the central opening among the three openings of the air supply duct 331 at the upper end of the cover holder 23 and communicates with the internal space of the air supply duct 331 and , the lower end is coupled in a sealed state to the circumferential surface of the air supply port of the cover holder 23 communicates with the inner space of the buried box (1). As shown in FIGS. 15 and 17 , the air supply pipe 333 has a cylindrical shape in which the sides of the air supply pipe 333 are closed and the upper and lower surfaces are open. ) is inserted and coupled to the central opening of the air supply duct 331 in a sealed state, and the lower end is welded to the circumferential surface of the air inlet of the cover holder 23, thereby sealing the air inlet of the cover holder 23. can be combined. When the lower end of the air supply pipe 333 is welded to the circumferential surface of the air supply port of the cover holder 23 , the air supply pipe 333 is difficult to separate from the cover holder 23 . In the present embodiment, the air conditioning unit 3 may be replaced by replacing the remaining components except for the air supply pipe 333 .

Each of the two guide members 334 is installed on the upper side of each air supply porous pipe 337 and provided with a passage through which the protruding rod of each floating body 336 can be inserted and slidably moved while air passes through each floating body ( 336) to guide the vertical movement. That is, the left guide member 334 is installed on the upper side of the left air supply perforated pipe 337 and has a passage through which the protruding rod of the left floating body 336 can be inserted and slidably moved while the air passes through the left floating body ( 336) to guide the vertical movement. Similarly, the right guide member 334 is installed on the upper side of the right air supply perforated pipe 337 and has a passage through which the protruding rod of the right floating body 336 can be inserted and slidably moved while the air passes through the right floating body ( 336) to guide the vertical movement.

In this way, each floating body 336 flows into each air supply porous pipe 337 without shaking inside each air supply porous pipe 337 because its protruding rod is inserted into the passage of each guide member 334 and slidably moved. It can move up and down in exact proportion to the amount of rainwater that has been created. As a result, in normal times, the sealing of the connection part of each air supply porous pipe 337 and the air supply duct 331 is prevented, so that the period in which the internal space of the buried box 1 is ventilated with the outside can be secured as much as possible, and in case of rain The opening of the connection portion of each air perforated pipe 337 and the air supply duct 331 is prevented, so that the inflow of rainwater into the inner space of the buried box 1 can be reliably blocked.

15-17, the upper surface of each guide member 334 is coupled to the circumferential surface of each of the openings at both ends of the air supply duct 331 in a sealed state, and a cylindrical passage is formed in the center thereof. It is composed of a cross-spoke inner frame whose ends are integrally connected to the inner surface of the outer frame and the ventilation passage of the outer frame, and a cylindrical guide passage is formed at the center. The upper surface of each guide member 334 may be coupled to the circumferential surface of each of the openings at both ends of the air supply duct 331 by welding, thereby sealingly coupled to the circumferential surfaces of the openings at both ends of the air supply duct 331 . In this way, each guide member 334 allows air to pass through the triangular column-shaped passages formed by dividing the inside of the cylindrical ventilation passage of the outer frame by the cross spoke shape of the inner frame, and By allowing the protruding rod of each floating body 336 to slide on the inner surface of the guide passage formed in the center of the inner frame inside, the vertical movement of each floating body 336 is guided.

Each of the two sealing packings 335 has a disk shape having a circular opening formed in the center thereof, and the upper surface thereof is coupled to the lower surface of each guide member 334 in a sealing state. That is, the upper surface of the left sealing packing 335 is coupled to the lower surface of the left guide member 334 , and the upper surface of the right sealing packing 335 is coupled to the lower surface of the left guide member 334 . Each sealing packing 335 may be made of a waterproof material having elasticity, such as rubber, and the upper surface thereof is adhered to the lower surface of each guide member 334 using a waterproof adhesive, thereby sealing the lower surface of each guide member 334 . can be combined with

When the circumference of the hole of the sealing packing 335 made of rubber is pressed by the spherical outer surface of the floating body 336, the hole of the sealing packing 335 is sealed. Accordingly, the waterproofing ability of the sealing packing 335 is determined by the force of the floating body 336 pressing the sealing packing 335 . Since the force of the floating body 336 pressing the sealing packing 335 is determined by the buoyancy force acting on the floating body 336 by the water inside the supply air perforated pipe 337, each floating body 336 is each supply air. It is preferable to have the maximum diameter in a state in which it can move up and down without friction with the inner surface of the perforated tube 337 .

Each of the two floating bodies 336 is located in the inner space of each air supply perforated pipe 337 and the internal space of each air perforated pipe 337 according to the amount of rainwater introduced through the holes of each air perforated pipe 337 . move up and down in That is, the left floating body 336 is located in the inner space of the left air supply perforated pipe 337, and according to the amount of rainwater introduced through the holes of the left air perforated pipe 337, the inner space of the left air perforated pipe 337. move up and down in Similarly, the right floating body 336 is located in the inner space of the right air supply perforated pipe 337 and in the inner space of the right air perforated pipe 337 according to the amount of water introduced through the holes of the right air perforated pipe 337. move up and down As shown in FIGS. 15-17 , each floating body 336 may be a spherical ball having a lighter weight than the buoyancy caused by water and having a protruding bar formed on one side. The floating body 336 is preferably made of a material having a specific gravity smaller than that of water so that it can float in rainwater. For example, the floating body 336 may be made of plastic, Styrofoam, rubber, or the like. In order to lighten the weight of the floating body 336, the inside of the floating body 336 may be empty.

Each of the two air supply perforated pipes 337 has an upper end in close contact with the circumferential surface of each of the openings at both ends of the lower surface of the air supply duct 331 , and the lower end is in close contact with the horizontal frame of the air conditioning zone of the cover holder 23 to provide an air supply pipe 333 . It is installed upright on the horizontal frame of the air conditioning zone of the cover holder 23 parallel to. That is, the upper end of the left air perforated pipe 337 is in close contact with the circumferential surface of the left end opening of the lower surface of the air supply duct 331 , and the lower end is in close contact with the horizontal frame of the air conditioning zone of the cover holder 23 , so that the air supply pipe 333 . It is installed upright on the horizontal frame of the air conditioning zone of the cover holder 23 parallel to. Similarly, the right air perforated pipe 337 has an upper end in close contact with the circumferential surface of the right end opening of the lower surface of the air supply duct 331 and a lower end in close contact with the horizontal frame of the air conditioning section of the cover holder 23 to form the air supply pipe 333 . It is installed upright on the horizontal frame of the air conditioning zone of the cover holder 23 parallel to.

Since the supply air perforated pipe 337 is not an element requiring waterproofing, the upper and lower ends of the air supply perforated pipe 337 do not need to be sealedly coupled to the air supply duct 331 and the cover holder 23 . Even, there may be some gap between the upper end of the supply air perforated pipe 337 and the air supply duct 331 , and any gap between the lower end of the air perforated pipe 337 and the horizontal frame of the air conditioning section of the cover holder 23 . Some gaps may exist. In this embodiment, the air supply perforated pipe 337 receives rainwater falling on the air conditioning unit 3 shown in FIG. 15 while guiding the floating body 336 together with the guide member 334 to move up and down without shaking Simultaneously serves to apply buoyancy to the sieve 336. Since the structure of the air conditioning unit 3 is very simple and can be easily separated from the object by employing the air supply perforated pipe 337, the replacement, repair, and management of the air conditioning unit 3 is very easy.

15-17, each air supply perforated pipe 337 has a plurality of holes formed on the side surface of the front direction, and the upper and lower surfaces have an open cylindrical shape. It is inserted between the circumferential surface of the cover holder 23 and the horizontal frame of the air conditioning zone of the cover holder 23 and the upper end is fitted around the lower side of the guide member 334 so that the upper end is on the circumferential surface of the opening at both ends of the lower surface of the air supply duct 331 The lower end is brought into close contact with the horizontal frame of the air conditioning zone of the cover holder 23 at the same time as being in close contact, and as a result, it can be installed upright in the horizontal frame of the air conditioning zone of the cover holder 23 in parallel with the air supply pipe 333 .

18 is a view illustrating an operation of the air conditioning unit 3 shown in FIG. 15 ventilating the inner space of the buried box 1, and FIG. 19 is the air conditioning unit 3 shown in FIG. ) is a diagram showing the operation of sealing the inner space of the 18-19, by the vertical movement of each floating body 336 in the inner space of each air supply porous pipe 337, the connection portion of each air supply porous pipe 337 and the air supply duct 331 is opened or By sealing it, air is introduced into the inner space of the buried box 1 from the outside through the air supply pipe 333 or the inflow of such air is blocked. That is, the connection portion of the left air supply perforated pipe 337 and the air supply duct 331 is opened or sealed by the vertical movement of the left floating body 336 in the internal space of the left air perforated pipe 337 . Similarly, the connection portion of the right air perforated pipe 337 and the air supply duct 331 is opened or sealed by the vertical movement of the right floating body 336 in the inner space of the right air perforated pipe 337 .

Each air supply perforated pipe 337 and the air supply duct 331 is coupled to the lower surface of the guide member 334 and the guide member 334 in a sealed state coupled to the circumferential surface of each of the openings at both ends of the air supply duct 331 in a sealed state. When the hole of each sealing packing 335 is opened or sealed because it is connected to the sealing packing 335, the connection portion of each air perforated pipe 337 and the air supply duct 331 is opened or sealed. 18-19, both the connection portion of the left air perforated pipe 337 and the air supply duct 331 and the connection portion of the right air perforated pipe 337 and the air supply duct 331 must be sealed. The inflow of air through 333 may be blocked, and if any one of these is open, air may be introduced through the air supply pipe 333 .

As shown in FIG. 18 , each floating body 336 descends in the inner space of each air supply porous pipe 337 between the perimeter of the hole of each sealing packing 335 and the spherical outer surface of each floating body 336 . When an empty space is formed by , the connection portion of each air supply porous pipe 337 and the air supply duct 331 is opened, so that the inner space of the buried box 1 can be ventilated to the outside through the air supply pipe 333 . Since the floating body 336 rises in proportion to the height of the water introduced through the holes of each air perforated pipe 337, there is no water inside each air perforated pipe 337 or the holes of each air perforated pipe 337 An empty space is formed between the spherical outer surface of each floating body 336 and the perimeter of the hole of each sealing packing 335 until water is introduced into The connection portion of each air perforated pipe 337 and the air supply duct 331 is opened.

That is, until there is no water in the inside of the left air perforated pipe 337 or water flows into the holes of the left air perforated pipe 337, until the left air perforated pipe 337 is submerged in water with a height below the critical water level An empty space is formed between the spherical outer surface of the sieve 336 and the periphery of the hole of the left sealing packing 335 to open the connection portion between the left air supply porous pipe 337 and the air supply duct 331 . Similarly, the right side floats until there is no water inside the right air perforated pipe 337 or water flows into the holes of the right air perforated pipe 337 and the right air perforated pipe 337 is submerged in water at a height below the critical water level. An empty space is formed between the spherical outer surface of the sieve 336 and the periphery of the hole of the right sealing packing 335 to open the connection portion between the right air supply porous pipe 337 and the air supply duct 331 .

As shown in FIG. 19, each floating body 336 rises in the inner space of each air supply porous pipe 337 so that the perimeter of the hole of each sealing packing 335 is on the spherical outer surface of each floating body 336. When pressed by the air supply porous pipe 337 and the air supply duct 331 is sealed, the air cannot be introduced through the air supply pipe (333). When water is introduced into the holes of each air perforated pipe 337 and each air perforated pipe 337 is submerged in water at a height exceeding the critical water level, the spherical outer surface of each floating body 336 is each sealed packing 335 . Each floating body 336 rises in the inner space of each air supply porous pipe 337 until the circumference of the hole is pressed, and as a result, the connection portion of each air supply porous pipe 337 and the air supply duct 331 is sealed will become

That is, when the left air perforated pipe 337 is submerged in water of a height exceeding the critical water level, the left floating body 336 rises by a height proportional to the level of water introduced through the holes of the left air perforated pipe 337. As the spherical outer surface presses the periphery of the hole of the left sealing packing 335 , the connection portion between the left air perforated pipe 337 and the air supply duct 331 is sealed. Similarly, when the right air perforated pipe 337 is submerged in water at a height exceeding the critical water level, the right floating body 336 rises by a height proportional to the height of the water introduced through the holes of the right air perforated pipe 337. As the spherical outer surface presses the periphery of the hole of the right sealing packing 335 , the connection portion between the right air perforated pipe 337 and the air supply duct 331 is sealed.

After each air perforated pipe 337 is submerged in water at a height exceeding the critical water level, water is discharged from the holes of each air perforated pipe 337 so that each air perforated pipe 337 is submerged in water with a height below the critical water level. When this happens, each floating body 336 is descended away from the perimeter of the hole of the sealing packing 335 , whereby there is an empty space between the spherical outer surface of each floating body 336 and the perimeter of the hole of each sealing packing 335 . A space is formed so that the connection portion of each air supply porous pipe 337 and the air supply duct 331 is opened. As described below, the exhaust unit 34 operates in the same manner as that of the air supply unit 33 . Therefore, the air conditioning unit 3 shown in FIG. 14 can seal the inner space of the buried box 1 only during rain and ventilate the inner space of the buried box 1 in normal times. Although the internal space of the buried box 1 is waterproof by the air conditioning unit 3, the temperature, humidity, etc. can be automatically maintained in a state similar to that of the outside through ventilation with the outside.

That is, the air conditioning unit 3 according to the present embodiment cools the transformer 100 installed in the inner space of the buried box 1 by natural convection so that the inner space of the buried box 1 is ventilated with the outside in normal times. When water flows into the air conditioning unit 3 due to the air conditioning function to maintain humidity, etc. in a state similar to that of the outside, and rain, etc., the internal space of the buried box 1 is sealed and installed in the internal space of the buried box 1 It has a waterproof function that prevents the transformer 100 from being submerged. As described above, the air conditioning unit 3 according to the present embodiment has a waterproof function in addition to the air conditioning function, so that air conditioning and waterproofing of the internal space of the object can be simultaneously performed at a very low cost without installing a separate ground facility for waterproofing the internal space of the object. can be done For example, if the electrical equipment is installed in the inner space of the buried box 1, the failure rate of the electric equipment due to overheating and excessive humidity can be greatly reduced, and the life of the electric equipment is extended because the electric equipment operates in an optimal state. can be

As described above, if any one of the connection part of the left air supply porous pipe 337 and the air supply duct 331 and the connection part of the right air supply porous pipe 337 and the air supply duct 331 is open, the buried box (1) air may be introduced into the inner space of the Therefore, in order to block the inflow of air through the air supply pipe 333, both the connection portion of the left air perforated pipe 337 and the air supply duct 331 and the connection portion of the right air perforated pipe 337 and the air supply duct 331 are must be sealed. On the other hand, when the left air supply porous pipe 337 and the right air supply porous pipe 337 are installed on a horizontal plane, the left air supply porous pipe 337 and the right air supply porous pipe 337 are submerged in water of the same height, and the As a result, the connection portion of the left air perforated pipe 337 and the air supply duct 331 and the connection portion of the right air perforated pipe 337 and the air supply duct 331 are simultaneously opened or sealed. Therefore, in order to more accurately control the sealing of the connection portion of the left air supply perforated pipe 337 and the air supply duct 331 and the connection portion of the right air supply perforated pipe 337 and the air supply duct 331, the left air supply perforated pipe 337 is and the right air supply perforated pipe 337 is preferably installed on a horizontal surface.

According to this embodiment, the spherical outer surface of each floating body 336 presses the perimeter of the hole of each sealing packing 335 installed at the connection site of each air supply porous pipe 337 and the air supply duct 331, so that each air supply Since the connection portion of the perforated pipe 337 and the air supply duct 331 is sealed, each floating body 336 is raised to less than 1/2 of the diameter of each floating body 336 of each sealing packing 335 . The hole is sealed. However, when the size of each floating body 336 is small, each floating body 336 may be momentarily submerged in water rapidly flowing through the holes of each air supply porous pipe 337 . When each floating body 336 is submerged in rainwater, rainwater may be introduced into the air supply pipe 333 . As the size of each floating body 336 increases, the possibility that each floating body 336 is submerged in water flowing into the holes of each air supply porous pipe 337 becomes increasingly rare.

In this embodiment, each floating body 336 has a diameter greater than the maximum diameter that can be submerged in the water flowing into the holes of each air supply perforated pipe 337 at the maximum flow rate. Accordingly, each floating body 336 cannot be submerged in the water inside each air supply porous pipe 337 even if water is introduced into the holes of each air supply porous pipe 337 at the maximum flow rate. Here, the maximum flow rate of water flowing in through the holes of each air supply porous pipe 337 refers to the holes of each supply air porous pipe 337 caused by rainfall at the place where the air conditioning unit 3 shown in FIGS. 15-17 is installed. It refers to the maximum flow rate of rainwater entering through the As described above, each floating body 336 preferably has a maximum diameter in a state that can be moved up and down without friction with the inner surface of each air supply porous pipe 337 . That is, the diameter of each floating body 336 is approximate to the inner diameter of each air supply porous pipe (337).

In a state raised to less than 1/2 of the diameter of the floating body 336 , the hole of the sealing packing 335 is sealed as well as the diameter of the floating body 336 is close to the inner diameter of the supply air perforated pipe 337 , so it is sealed The height of the water introduced into the inside of the supply air perforated pipe 337 until the hole of the packing 335 is sealed is raised to less than 1/2 of the diameter of the floating body 336 and introduced into the inside of the supply air perforated pipe 337. Water is blocked by the half of the diameter of the floating body 336 having a diameter close to the inner diameter of the supply air perforated pipe 337, that is, the widest part. As a result, the possibility that water is introduced from the holes in the upper portion of the air supply perforated pipe 337 located at a height of 1/2 or more of the diameter of the floating body 336 disappears. In addition, since the inner space of the air supply duct 331 is located higher than the lower portion of each air perforated pipe 337 , the inflow of rainwater into the air supply pipe 333 is completely blocked.

When the hole of each air perforated pipe 337 is large, water flows into the inside of each air perforated pipe 337 quickly, so as soon as it starts to rain, the floating body 336 rises, and each air perforated pipe 337 and The connection portion of the air supply duct 331 can be immediately sealed. However, when the size of the floating body 336 is too small compared to the size of the hole of each air supply porous pipe 337, the floating body 336 is submerged in the water introduced into the air supply porous pipe 337 and supplied. There is a possibility that water will enter the organ 333 . On the other hand, when the hole of each air perforated pipe 337 is small, since water slowly flows into the inside of each air perforated pipe 337, the floating body 336 in the water introduced into the inside of each air perforated pipe 337. Chances of being locked out are slim. However, when the size of the hole of each air supply porous pipe 337 is too small compared to the size of the floating body 336, the floating body 336 slowly rises and after a certain amount of time has elapsed after it starts to rain, each Since the connection portion of the air supply porous pipe 337 and the air supply duct 331 is sealed, the reactivity of the sealing of the connection portion of each air supply porous tube 337 and the air supply duct 331 may be reduced. By bridging the reactivity of the sealing of the connection part of each air perforated pipe 337 and the air supply duct 331 and the risk of flooding of the floating body 336, the holes of each air perforated pipe 337 are designed to have an optimal size. desirable.

15, the exhaust part 34 includes an exhaust duct 341, a piping gasket 342, an exhaust pipe 343, two guide members 344, two sealing packings 345, two floating bodies ( 346 ), and two exhaust perforated tubes 347 . Air supply duct 331 , piping gasket 332 , air supply pipe 333 , two guide members 334 , two sealing packings 335 , two floating bodies 336 , and two air supply perforated pipes 337 ) performs an air supply operation, but an exhaust duct 341, a piping gasket 342, an exhaust pipe 343, two guide members 344, two sealing packings 345, two floating bodies 346, and The two exhaust perforated pipes 347 perform an exhaust operation. Since the configuration of the two embodiments is the same except for these differences, only the basic configuration related to the exhaust operation will be described below, and the description of the remaining configurations will be replaced with the description described above with respect to FIGS. 15-17 .

The exhaust duct 341 is connected between the upper end of the exhaust pipe 343 and the upper end of the two exhaust perforated pipes 347 so that the exhaust pipe 343 and the two exhaust perforated pipes 347 communicate with each other. Referring to FIG. 15 , the exhaust duct 341 includes a duct upper plate 3411 , a duct gasket 3412 , and a duct lower plate 3413 . The piping gasket 342 is inserted between the upper end of the exhaust pipe 343 and the circumferential surface of the central opening of the exhaust duct 341 in the shape of a square plate having a circular opening formed at the center of the exhaust duct 341 . The gap between the peripheral surface of the opening and the upper end of the exhaust pipe 343 is sealed. The exhaust pipe 343 is sealed to the circumferential surface of the central opening among the three openings of the exhaust duct 341 at the upper end of the cover holder 23 at the upper side of the cover holder 23 and communicates with the internal space of the exhaust duct 341, The lower end is coupled in a sealed state to the circumferential surface of the exhaust port of the cover holder 23 and communicates with the inner space of the buried box (1).

Each of the two guide members 344 is installed on the upper side of each exhaust perforated pipe 347 and has a passage through which the protruding rod of each floating body 346 is inserted and slidably moved as air passes through each floating body ( 346) to guide the vertical movement. Each of the two sealing packings 345 has a disk shape having a circular opening formed in the center thereof, and an upper surface thereof is coupled to a lower surface of each guide member 344 . When the circumference of the hole of each sealing packing 345 is pressed by the spherical outer surface of each floating body 346, the hole of each sealing packing 345 is sealed. Each of the two floating bodies 346 is located in the inner space of each exhaust perforated pipe 347 and in the inner space of each exhaust perforated pipe 347 according to the amount of water introduced through the holes of each exhaust perforated pipe 347 . move up and down Each of the two exhaust perforated pipes 347 has an upper end in close contact with the circumferential surface of each of the openings at both ends of the lower surface of the exhaust duct 341 and a lower end in close contact with the horizontal frame of the air conditioning zone of the cover holder 23 to form an exhaust pipe 343 and It is installed upright on the horizontal frame of the air conditioning zone of the cover holder 23 in parallel.

By the vertical movement of each floating body 346 in the inner space of each exhaust perforated pipe 347, the connection portion of each exhaust perforated pipe 347 and the exhaust duct 341 is opened or sealed, thereby reducing the exhaust pipe 343. Air flows out from the inner space of the buried box 1 through the passage or the outflow of this air is blocked. That is, each floating body 346 descends in the inner space of each exhaust perforated pipe 347 to form an empty space between the perimeter of the hole of each sealing packing 345 and the spherical outer surface of each floating body 346 . When the connection portion of each exhaust perforated pipe 347 and the exhaust duct 341 is opened, air flows out into the inner space of the buried box 1 through the exhaust pipe 343 . When each floating body 346 rises in the inner space of each exhaust perforated pipe 347 and the perimeter of the hole of each sealing packing 345 is pressed by the spherical outer surface of each floating body 346, each exhaust perforated pipe The connection portion between the 347 and the exhaust duct 341 is sealed to block the outflow of air through the exhaust pipe 343 .

As shown in FIGS. 18-19 , both the connection part of the left exhaust perforated pipe 347 and the exhaust duct 341 and the connection part of the right exhaust perforated pipe 347 and the exhaust duct 341 must be sealed in the exhaust pipe 343 . ) may be blocked from outflow of air, and if any one of these is open, air may flow out through the exhaust pipe 343 . As shown in FIGS. 1 and 14 , the connection part of the left air supply porous pipe 337 and the air supply duct 331 of the air supply part 33 and the connection part of the right air supply porous pipe 337 and the air supply duct 331 and Both the connection part of the left exhaust perforated pipe 347 and the exhaust duct 341 and the connection part of the right exhaust perforated pipe 347 and the exhaust duct 341 of the exhaust part 34 must be sealed inside the buried box (1). The space may be sealed, and if any one of these is open, the inner space of the buried box 1 may be ventilated.

The cooling unit 4 cools the transformer 100 by using the cooling water introduced from the outside of the buried box 1 through the pipes installed inside and outside the buried box 1 under the control of the controller 5 . . Referring to FIG. 1 , the cooling unit 4 includes a water tank 41 , a water cooler 42 , and a pipe 43 . The water tank 41 is located outside the buried box 1, and water cooled by the temperature difference between the inside and the outside of the buried box 1 is stored therein. The water tank 41 may be installed in a shape of a square box whose entire surface is sealed and installed in close contact with one of the four sides of the buried box 1 . In the buried box (1), a protruding portion of a certain width for supporting the water tank (41) in close contact with one side thereof is formed around the side of the buried box (1) at a certain height. Since the water tank 41 is buried underground together with the buried box 1, it is supported by the protruding part of the periphery of the side of the buried box 1 and the surrounding rubble, soil, etc. can be fixed.

For cooling the water stored in the water tank 41 , at least one gap is formed in the buried box 1 to allow rainwater flowing into the cover 2 to flow out of the buried box 1 . For example, as shown in Figures 6-11, each of the four side surfaces of the buried box (1) is formed with a gap through which rainwater flowing into the cover (2) flows out. As described above, the cover holder 23 is inserted into close contact with the upper end of the inner surface of the buried box 1 and is seated and coupled to the protruding portion below the upper end of the inner surface of the buried box 1 in a sealed state. A gap is formed in the lower edge of the cover holder 23 that is coupled in a sealed state to the protruding part under the upper end of the inner surface of the buried box 1 so that the rainwater flowing into the cover part 2 flows out, and this Correspondingly, a gap is also formed in the portion of the buried box 1 in contact with the gap of the cover holder 23 . Rainwater flowing into the cover 2 passes through the gap between the cover holder 23 and the buried box 1 to be discharged to the outside of the buried box (1).

The outer surface of the water tank 41 is cooled by rainwater flowing out through the gap of the buried box 1 in contact with the gap of the cover holder 23, and the water tank (41) is cooled by the cooling of the outer surface of the water tank (41). The water stored in 41 is cooled and supplied to the water cooler 42 through the water supply pipe 431 . During rain, the rainwater introduced through the ground surface may flow to rubble, soil, etc. around the water tank 41 . Accordingly, the outer surface of the water tank may be cooled by rainwater flowing into rubble, soil, etc. around the water tank 41 in addition to rainwater flowing out through the gap of the buried box 1 . In order to improve the cooling efficiency of the water stored in the water tank 41, it is preferable to increase the contact area between the water stored in the water tank 41 and the outer surface of the water tank 41 as much as possible. Accordingly, the inside of the water tank 41 may be formed in the shape of a pipe twisted in various shapes.

The water cooler 42 is located in the inner space of the buried box 1 under the control of the controller 5 and uses the water introduced from the water tank 41 as cooling water. 100) is cooled. As such, by using the water introduced from the water tank 41 located outside the buried box 1 as the cooling water, the consumption of electric energy according to the cooling of the transformer 100 can be reduced. In more detail, the water cooler 42 compresses the refrigerant and condenses the compressed refrigerant with water flowing in from the water tank 41 , thereby using heat absorption in the vaporization process of the condensed refrigerant to transform the transformer 100 . Cool down. For example, the water cooler 42 may cool the transformer 100 by absorbing heat in the inner space of the buried box 1 . R-22 may be used as the refrigerant, and other materials may be used. A feature of the water cooling method according to this embodiment is to cool the transformer 100 using water from a water tank 41 installed on one side of the buried box 1 . On the other hand, the cooling method according to the compression, condensation, and vaporization of the refrigerant is a technique known to those of ordinary skill in the art to which this embodiment belongs, so a detailed description thereof will be omitted.

The pipe 43 is connected between the water tank 41 and the water cooler 42 to circulate water between the water tank 41 and the water cooler 42 . Referring to FIG. 1 , the pipe 43 includes a water supply pipe 431 and a drain pipe 432 . The water supply pipe 431 is connected between the water tank 41 and the water cooler 42 to supply the water stored in the water tank 41 to the water cooler 42 . The water supply pipe 431 may be connected between the water tank 41 and the water cooler 42 by sealingly coupling one end to the water tank 41 and sealing the other end to the water cooler 42 . The drain pipe 432 is connected between the water tank 41 and the water cooler 42 to supply water discharged from the water cooler 42 to the water tank 41 . The drain pipe 432 may be connected between the water tank 41 and the water cooler 42 by sealingly coupling one end to the water tank 41 and sealing the other end to the water cooler 42 . 1, 10, 11, the sealing member 44 for allowing the water supply pipe 431 and the drain pipe 432 to pass through the lower wall of the buried box 1 in a sealed state is a buried box (1). pressed into the lower wall of the

The control unit 5 controls the driving of at least one of the air conditioning unit 3 and the cooling unit 4 according to at least one of whether the inner space of the buried box 1 is sealed and the temperature. The control unit 5 may be implemented as a micro computer. In more detail, the control unit 5 stops the driving of the air conditioning unit 3 depending on whether the inner space of the buried box 1 is sealed, thereby providing a space between the inner space of the buried box 1 and the outer space of the buried box. Forced air circulation between the internal space of the buried box 1 and the external space of the buried box 1 by allowing the transformer 100 to be cooled by natural convection generated due to a temperature difference or by driving the air conditioning unit 3 By this, the transformer 100 may be cooled. In addition, the control unit 5 stops the driving of the fan 35 of the air conditioning unit 3 according to the temperature of the inner space of the buried box 1 to thereby stop the inner space of the buried box 1 and the outside of the buried box 1 . The internal space of the buried box 1 and the buried box 1 by allowing the transformer 100 to be cooled by natural convection generated due to the temperature difference between the spaces or by driving the fan 35 of the air conditioning unit 3 The transformer 100 may be cooled by forced air circulation between the external spaces of the

The air conditioning unit 3 according to this embodiment includes a fan 35 and proximity sensors 338 and 348 to the components of the air conditioning unit 3 described above for forced air circulation of the internal space of the buried box 1 . is added As shown in FIG. 15 , the proximity sensors 338 and 348 are installed inside the air conditioner 3 shown in FIG. 6 . As shown in FIG. 1 , the fan 35 is installed in the horizontal frame of the air conditioning zone of the cover holder 23 at the lower side of the cover holder 23 . On the other hand, in order to intermittently perform cooling of the inner space of the buried box (1) according to the temperature of the inner space of the buried box (1), a temperature sensor is installed in the inner space of the buried box (1). The proximity sensor 70 is installed on the upper end side of each perforated tube 337, 347 and detects the proximity between this and each floating body 336, 346. The temperature sensor detects the temperature of the inner space of the buried box (1). The temperature sensor is not an element having any technical characteristics in its external or internal structure, and since the present embodiment can be understood only by description thereof, it is omitted from FIG. 1 to avoid complicating the drawing.

The fan 35 is coupled to the circumferential surface of the air supply port of the cover holder 23 from the lower side of the cover holder 23 under the control of the control unit 5 and from the outside of the buried box 1 through the air supply pipe 333 . It sucks air and is coupled to the circumferential surface of the exhaust port of the cover holder 23 from the lower side of the cover holder 23 and discharges the air to the outside of the buried box 1 through the exhaust pipe 343 through the air supply pipe 333 The sucked air is forcibly circulated in the inner space of the buried box 1 to be discharged through the exhaust pipe 343 . Since the inner space of the buried box 1 is sealed during rain by the air supply 3 and the exhaust 4 , the fan 35 is sealed to the circumferential surface of the air supply port of the cover holder 23 . No need. However, since the efficiency of the fan 35 decreases as the distance between the circumferential surface of the air supply port of the fan 35 and the cover holder 23 increases, the circumference of the air supply port of the fan 35 and the cover holder 23 as much as possible. It is preferable that the surfaces are bonded as closely as possible.

Referring to FIG. 1 , the fan 35 includes an air supply fan 351 , an exhaust fan 352 , and a fan case 353 . The air supply fan 351 is coupled to the circumferential surface of the air supply port of the cover holder 23 from the lower side of the cover holder 23 in a sealed or unsealed state, and the blade rotates in the direction of sucking air from the air supply pipe 333 . by sucking air from the outside of the buried box (1) through the air supply pipe (333) and discharged to the inner space of the buried box (1). The air supply fan 351 may be coupled in a sealed state to the circumferential surface of the air inlet of the cover holder 23 to improve its efficiency. The exhaust fan 352 is coupled to the circumferential surface of the exhaust port of the cover holder 23 from the lower side of the cover holder 23 in an unsealed state, and is a buried box ( 1) sucks air from the internal space and discharges it to the outside of the buried box 1 through the exhaust pipe 343 . The fan case 353 is coupled to the inner surface of the object 100 in a state accommodating the air supply fan 351 and the exhaust fan 352 , so that each fan 351 , 352 is a peripheral surface of the air supply port of the cover holder 23 . and to be coupled to the circumferential surface of the exhaust port of the cover holder 23 .

As described below, the driving of the air supply fan 351 and the exhaust fan 352 is stopped under the control of the control unit 5 during rain. The supply fan 351 and the exhaust fan 352 may be driven even during rain due to various causes such as a failure of the control unit 5 . Since the drive of the air supply fan 351 acts in a direction to raise the floating body 336 inside the air supply perforated pipe 337, even if the air supply fan 351 is abnormally driven, the motor temperature of the air supply fan 351 rises, No problems other than unnecessary power consumption. On the other hand, since the driving of the exhaust fan 352 acts in the direction of lowering the floating body 346 inside the supply air perforated pipe 337, if the exhaust fan 352 is abnormally driven, in addition to the above problem, the exhaust fan ( The problem that the floating body 346 is lowered by the driving of the floating body 346 and the perimeter of the hole of the spherical outer surface of the floating body 346 and the sealing packing 345 is widened, and rainwater flows into the hole of the sealing packing 345 can occur

A wind force smaller than the buoyancy force of each floating body 346 generated by the water introduced through the holes of each exhaust perforated pipe 347 acts on each floating body 346 located in the inner space of each exhaust perforated pipe 347 . A gap may be formed between the exhaust fan 352 and the circumferential surface of the exhaust port of the cover holder 23 . In this way, the wind force smaller than the buoyancy of each floating body 346 generated by the water introduced through the holes of each exhaust perforated pipe 347 is each floating body 346 located in the inner space of each exhaust perforated pipe 347 . ), even if the exhaust fan 352 is driven in a state where the spherical outer surface of each floating body 346 presses the circumference of the hole of each sealing packing 345, the air discharged from the exhaust fan 352 is the exhaust fan It exits through the gap between the circumferential surface of the exhaust port 352 and the cover holder 23 . That is, each floating body 346 does not descend by the driving of the exhaust fan 352 in a state in which the spherical outer surface of each floating body 346 presses the circumference of the hole of each sealing packing 345 , and as a result, the floating body 346 does not descend. There is no gap between the spherical outer surface of the floating body 346 and the perimeter of the hole of the sealing packing 345 .

The control unit 5 measures at least one of the position of each floating body 336 in the interior of each air supply porous pipe 337 and the position of each floating body 346 in the interior of each exhaust porous pipe 347, , depending on whether the measurement result indicates the sealing of at least one of the connection portion of each air supply porous pipe 337 and the supply air duct 331 and the connection portion of each exhaust porous tube 347 and the exhaust duct 341 ) to control the drive. That is, when the two air supply porous pipes 337 and the two exhaust porous pipes 347 are installed on a horizontal surface, the two air supply porous pipes 337 and the two exhaust porous pipes 347 are submerged in water of the same height. As a result, the connection part of each air supply porous pipe 337 and the air supply duct 331 and the connection part of each exhaust porous pipe 347 and the exhaust duct 341 are simultaneously opened or sealed.

In this case, the control unit 5 controls any one of the position of each floating body 336 inside each air supply porous pipe 337 and the position of each floating body 346 inside each exhaust porous pipe 347 . is measured, and the measurement result indicates the sealing of any one of the connection part of each air supply porous pipe 337 and the supply air duct 331 and the connection part of each exhaust porous pipe 347 and the exhaust duct 341 The driving of the fan 35 can be controlled by judging by the sealing of both the connection part of each air supply porous pipe 337 and the air supply duct 331 and the connection part of each exhaust porous pipe 347 and the exhaust duct 341 . . Otherwise, the control unit 5 measures the position of each floating body 336 in the interior of each air supply porous pipe 337, and the measurement result is the connection portion of each air supply porous pipe 337 and the air supply duct 331. Controlling the driving of the air supply fan 351 depending on whether sealing is indicated, measuring the position of each floating body 346 inside each exhaust perforated pipe 347, and the measurement result is obtained with each exhaust perforated pipe 347 and The operation of the exhaust fan 352 may be controlled depending on whether the connection portion of the exhaust duct 341 is sealed.

Proximity sensors 338 and 348 are installed on at least one of the upper side of each air supply perforated pipe 337 and the upper side of each exhaust perforated pipe 347 so as to move up and down in the internal space of each air supply perforated pipe 337 . The proximity of the floating body 336 is detected, and the proximity of each floating body 346 moving up and down in the internal space of each exhaust perforated pipe 347 is detected. As shown in FIGS. 1-3, the proximity sensors 338 and 348 are installed on the upper side of the proximity sensor 338 and each exhaust porous pipe 347 installed on the upper side of each supply air perforated pipe 337. The proximity sensor 348 is configured separately. That is, the proximity sensor 338 is inserted into the guide member 334 installed on the upper end side of each air supply perforated pipe 337 to detect the proximity distance between the proximity sensor 338 and each floating body 336 . Similarly, the proximity sensor 348 is inserted into the guide member 344 provided on the upper end side of each exhaust perforated pipe 347 to detect the proximity distance between the proximity sensor 348 and each floating body 346 .

The control unit 5 controls the proximity of each floating object 336 moving up and down in the inner space of each air supply porous pipe 337, that is, the proximity of each air supply porous pipe 337 from the proximity distance detected by the proximity sensor 338. Measuring the position of each floating body 336 in the internal space and the proximity of each floating body 346 moving up and down in the internal space of each exhaust perforated pipe 347 , that is, the proximity detected by the proximity sensor 348 . From the distance, the position of each floating body 346 in the internal space of each exhaust perforated pipe 347 is measured. The amount of water introduced into the air conditioning unit 3 depends on whether the connection part of each air supply porous pipe 337 and the air supply duct 331 is sealed and whether the connection part of each exhaust porous pipe 347 and the exhaust duct 341 is sealed. It can be detected in various ways, such as a method of measuring .

According to this embodiment, the spherical outer surface of each floating body (336, 346) presses the circumference of the hole of each sealing packing (335, 345) of each perforated pipe (337, 347) and the duct (331, 341) Since the connecting portion is sealed, the position of each floating body 336 and 346 in the inner space of each perforated tube 337 and 347 is the sealing of the connecting portion of each of the perforated tubes 337 and 347 and the ducts 331 and 341 . can be expressed without error. In particular, the proximity sensors 338 , 348 can measure the proximity of each floating object 336 , 346 very accurately in a non-contact manner. Although various detection methods are possible, the detection method as described above is based on whether the connection portion of each air supply porous pipe 337 and the supply air duct 331 is sealed, and whether each exhaust porous pipe 347 and the exhaust duct 341 is sealed. It is possible to very accurately detect whether the joint is sealed or not.

In more detail, the control unit 5 determines that the above-described measurement result is between the connection portion of each air supply porous pipe 337 and the air supply duct 331 and the connection portion between each exhaust porous tube 347 and the exhaust duct 341 . Showing at least one seal stops the drive of the air supply fan 351 and the exhaust fan 352 . When any one of the connection part of the supply air duct 331 and the connection part of each exhaust perforated pipe 347 and the exhaust duct 341 is sealed, air circulation between the internal space and the external space of the buried box 1 becomes impossible. Therefore, when it is determined that at least one of the connection portion of each air supply perforated pipe 337 and the air supply duct 331 and the connection portion of each exhaust perforated pipe 347 and the exhaust duct 341 is sealed, each fan 51, 52 In order to prevent overheating and unnecessary power consumption, the control unit 5 stops the driving of the air supply fan 351 and the exhaust fan 352 .

In addition, the control unit 5 indicates that the above-described measurement result indicates the opening of both the connection portion of each air supply porous pipe 337 and the supply air duct 331 and the connection portion of each exhaust porous tube 347 and the exhaust duct 341 , If the temperature of the internal space of the object is less than or equal to the first critical temperature, the driving of the air supply fan 351 and the exhaust fan 352 is stopped, and the above-described measurement result indicates that each air supply porous pipe 337 and the air supply duct 331 are connected. When the temperature of the internal space of the buried box 1 exceeds the first critical temperature and is less than or equal to the second critical temperature, the supply fan ( 351 and the exhaust fan 352 are driven. Here, the first critical temperature refers to the lowest temperature that can deteriorate the transformer 100 located in the inner space of the buried box 1 when maintained for a long period of time (eg, 24 hours), and the second critical temperature The temperature refers to the lowest temperature that can deteriorate the transformer 100 in a short period of time (eg, 1 hour).

As such, according to the present embodiment, deterioration and failure of the transformer 100 installed in the inner space of the buried box 1 due to overheating are prevented, and power consumption according to the driving of each fan 51 and 52 is prevented. In order to minimize The air supply fan 351 and the exhaust fan 352 are driven when the temperature of is greater than the first threshold temperature and less than or equal to the second threshold temperature. That is, in this embodiment, when the temperature of the internal space of the buried box 1 exceeds the first critical temperature and is less than or equal to the second critical temperature, forced air circulation is made between the internal space and the external space of the buried box 1 . It is possible to rapidly cool the transformer 100 installed in the inner space of the buried box (1). When the temperature of the internal space of the buried box 1 is below the first critical temperature, the opening of the connection portion of each air supply porous pipe 337 and the air supply duct 331 and each exhaust porous pipe 347 and the exhaust duct 341 It is possible to cool the transformer 100 installed in the inner space of the buried box 1 by natural convection between the inner space and the outer space of the buried box 1 generated according to the opening of the connection portion of the buried box (1).

In addition, the controller 5 controls the water cooler 42 of the cooling unit 4 when the temperature of the inner space of the buried box 1 exceeds the second critical temperature regardless of whether the inner space of the buried box 1 is sealed. to drive Even in a state in which the inner space of the buried box 1 is opened, the temperature of the transformer 100 located in the inner space of the buried box 1 may rapidly rise due to various reasons. Accordingly, the controller 5 controls the water cooler 42 of the cooling unit 4 when the temperature of the inner space of the buried box 1 exceeds the second critical temperature even when the inner space of the buried box 1 is open. to drive On the other hand, the control unit 5 indicates that the above-described measurement result indicates the opening of both the connection portion of each air supply porous pipe 337 and the air supply duct 331 and the connection portion of each exhaust porous tube 347 and the exhaust duct 341 . When the temperature of the internal space of the object exceeds the second critical temperature, the water cooler 42 of the cooling unit 4 may be driven and the air supply fan 351 and the exhaust fan 352 may be driven at the same time. In this case, the inner space of the buried box 1 can be cooled most rapidly.

As described above, the control unit 5 indicates the opening of both the connection part of each air supply porous pipe 337 and the supply air duct 331 and the connection part of each exhaust porous pipe 347 and the exhaust duct 341, and the buried box When the temperature of the internal space of (1) exceeds the first critical temperature and is less than or equal to the second critical temperature, the supply fan 351 and the exhaust fan 352 are driven, and the temperature of the internal space of the buried box 1 is 2 When the critical temperature is exceeded, the water cooler 42 of the cooling unit 4 is driven. The water cooler 42 of the cooling unit 4 consumes a very large amount of power compared to the fan 35 of the air conditioning unit 3 at the same time. As such, the present embodiment minimizes the driving time of the cooling unit 4 according to the temperature of the internal space of the buried box 1 and, while overheating the transforming unit 100 of the internal space of the buried box 1, the transformer (100) can be rapidly cooled, and by maximizing cooling by natural convection, power according to the driving of the water cooler 42 of the cooling unit 4 and the fans 351 and 352 of the air conditioning unit 3 consumption can be minimized.

According to the embodiments as described above, the air conditioning unit 3 and the buried box 1 that cools the transformer 100 by ventilating or sealing the inner space of the buried box 1 according to the inflow of rainwater. By adopting the cooling unit 4 that cools the transformer 100 using the cooling water introduced from the outside of the It is possible to provide an underground buried transformer having a cooling function for cooling the transformer 100 located in the enclosed space. As a result, high-voltage transformers that generate a lot of heat can be installed underground, making the urban environment on the ground more pleasant. The safety of citizens can be guaranteed. Furthermore, electric energy according to cooling of the transformer 100 by controlling the driving of at least one of the air conditioning unit 3 and the cooling unit 4 according to at least one of whether the internal space of the buried box 1 is sealed and the temperature consumption can be further reduced.

So far, with respect to the present invention, the preferred embodiments have been looked at. Those of ordinary skill in the art to which the present invention pertains will understand that the present invention may be implemented in a modified shape without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments are to be considered in an illustrative rather than a restrictive sense. The scope of the present invention is indicated in the claims rather than the foregoing description, and all differences within the scope equivalent thereto should be construed as being included in the present invention.

1 ... buried box 2 ... cover
21 ... cover frame 22 ... top plate
23 ... cover holder 24 ... instrument cover
25 ... access cover 26 ... support
3 ... air conditioning unit 31 ... housing
32 ... filter 33 ... air supply
34 ... exhaust 35 ... fan
4 ... cooling unit 41 ... water tank
42 ... water cooler 43 ... plumbing
5 ... control unit 100 ... transformer unit

Claims (7)

A buried box that is buried underground in the form of a manhole in which the side and lower surfaces of the front are sealed and the upper surface is an open manhole;
a cover portion covering the open portion of the upper surface of the buried box to seal the inner space of the buried box;
It is located in the inner space of the buried box and converts the AC voltage input from the input cable penetrating the wall of the buried box in a sealed state using electromagnetic induction to an output cable that penetrates the wall of the buried box in a sealed state. a transformer that outputs;
an air conditioning unit for cooling the transformer located in the inner space of the buried box using air introduced from the outside of the buried box by ventilating or sealing the inner space of the buried box according to the inflow of rainwater; and
and a cooling unit for cooling the transformer using cooling water introduced from the outside of the buried box through a pipe installed inside and outside the buried box. The method of claim 1,
The cover part ventilates or seals the inner space of the buried box by the air conditioning unit in a sealed state in which the inner space of the buried box is sealed by coupling the periphery of the cover part and the perimeter of the upper surface side open portion of the buried box in a sealed state. An underground buried transformer that communicates with the air conditioning unit in a sealed state so that it can be The method of claim 1,
The air conditioning unit is mounted on the cover unit so as to communicate in a sealed state with at least one ventilation port of the cover unit to ventilate or seal the inner space of the buried box according to the inflow of rainwater into the air conditioning unit. The method of claim 1,
the cooling unit
a water tank located outside the buried box and storing water cooled by a temperature difference between the inside and the outside of the buried box; and
and a water cooler positioned in the inner space of the buried box and configured to cool the transformer using water introduced from the water tank as the cooling water. The method of claim 1,
Underground buried transformer further comprising a control unit for controlling the operation of at least one of the air conditioning unit and the cooling unit according to at least one of whether the internal space of the buried box is sealed and the temperature. 6. The method of claim 5,
The control unit stops the operation of the fan of the air conditioning unit according to whether the inner space of the buried box is sealed, so that the pressure is transformed by natural convection generated due to a temperature difference between the inner space of the buried box and the outer space of the buried box Underground buried transformer for cooling the transformer or for cooling the transformer by forced air circulation between the inner space of the buried box and the outer space of the buried box by driving the fan of the air conditioning unit. 6. The method of claim 5,
The control unit stops the operation of the fan of the air conditioning unit according to the temperature of the inner space of the buried box, so that the transformation unit by natural convection generated due to a temperature difference between the inner space of the buried box and the outer space of the buried box. Heat in the process of vaporizing the refrigerant by cooling the transformer or by driving the fan of the air conditioning unit to cool the transformer by forced air circulation between the internal space of the buried box and the external space of the buried box, or by driving the cooling unit An underground buried transformer that cools the transformer by absorption.

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