Anti-condensation ring network cabinet and anti-condensation method

Abstract

The present invention discloses an anti-condensation ring network cabinet and an anti-condensation method, which belongs to the field of the anti-condensation technology of the ring network cabinet, and comprises an outer cabinet and a ring network cabinet body arranged in the outer cabinet, wherein a mounting seat is arranged at the bottom of the outer cabinet, a cable well is arranged at the bottom of the mounting seat, an upper air door mechanism communicating with the inner cavity of the outer cabinet is arranged at the top of the outer cabinet, a lower air door mechanism communicating with the inner cavity of the outer cabinet is arranged at the bottom of the outer cabinet, the lower air door mechanism is communicated with the cable well, and the cable well is communicated with an exhaust passage. The present invention is specially designed for the ring network cabinet, and the scheme abandons the traditional anti-condensation method of the dehumidifier, designs a circulating airflow from top to bottom for the inner cavity of the outer cabinet of the ring network cabinet, introduces dry natural wind from the outside, and discharges the moisture in the outer cabinet to the ground through the cable well and the exhaust passage, so as to prevent the water vapor in the cable well from entering the inner cavity of the outer cabinet of the ring network cabinet to form condensation.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-condensation for ring main unit, and in particular to an anti-condensation ring main unit and an anti-condensation method. Background Art

[0002] Ring main unit is a group of electrical equipment installed in a metal or non-metallic insulation cabinet or made into an assembled interval ring main unit. Its core part uses load switches and fuses. It has the advantages of simple structure, small size, low price, improved power supply parameters and performance, and power supply safety. It is widely used in distribution stations and box-type substations in urban residential areas, high-rise buildings, large public buildings, factories and enterprises and other load centers.

[0003] In high temperature seasons or when the power load is large, the cables in the cable trench below the outer cabinet of the ring main unit heat up severely, and the moisture in the cable trench evaporates and turns into water vapor, which enters the inner cavity of the outer cabinet along the cable routing holes below, and forms condensation in the ring main unit body inside the inner cavity of the outer cabinet. Condensation will not only cause creepage and flashover accidents, affecting the insulation performance and service life of the equipment, but also cause major safety accidents when the discharge is serious.

[0004] The traditional method is to install a dehumidifier inside the external cabinet and the ring network cabinet to reduce the moisture in the air inside the cabinet and reduce the air humidity inside the cabinet. However, when a large amount of water vapor enters the cabinet, the dehumidification effect of the dehumidifier is very unobvious. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides an anti-condensation ring network cabinet and an anti-condensation method; the anti-condensation ring network cabinet and the anti-condensation method are specially designed for the ring network cabinet. This scheme abandons the traditional dehumidifier anti-condensation method, and designs a circulating airflow from top to bottom for the inner cavity of the outer cabinet of the ring network cabinet, introduces dry natural wind from the outside, and discharges the moisture in the outer cabinet to the ground through the cable well and the exhaust channel, so as to prevent the water vapor in the cable well from entering the inner cavity of the outer cabinet of the ring network cabinet to form condensation.

[0006] In order to solve the above technical problems, the present invention provides an anti-condensation ring network cabinet, including an outer cabinet and a ring network cabinet body arranged in the outer cabinet, the bottom of the outer cabinet is provided with a mounting seat, the bottom of the mounting seat is provided with a cable well, the top of the outer cabinet is provided with an upper air door mechanism connected to the inner cavity of the outer cabinet, the bottom of the outer cabinet is provided with a lower air door mechanism connected to the inner cavity of the outer cabinet, the lower air door mechanism is connected to the cable well, and the cable well is connected with an exhaust channel.

[0007] In a further improvement of the present invention, the upper air door mechanism comprises an air inlet transverse pipe with air inlet valves at both ends, the middle of the air inlet transverse pipe is connected with an air inlet vertical pipe, the air inlet vertical pipe passes through the top of the outer cabinet and is connected with a truncated cone-shaped pipe, and an air inlet fan is arranged at the outlet end of the truncated cone-shaped pipe; a drying layer is arranged in the air inlet transverse pipe.

[0008] Through the above design, this solution can be more convenient for air intake. When in use, natural wind enters the air inlet horizontal pipe through the air inlet valve, enters the air inlet vertical pipe after being dried by the drying layer, and is discharged into the inner cavity of the outer cabinet by the air inlet fan after passing through the air inlet vertical pipe and the frustum-shaped pipe.

[0009] In a further improvement of the present invention, the above-mentioned air inlet valve includes a mounting tube connected to the air inlet transverse duct, a flap is arranged in the mounting tube, the flap is connected to a rotating shaft, the rotating shaft passes through a bearing embedded in the wall of the mounting tube and is connected to a motor, and the motor is installed on the outer top of the outer cabinet.

[0010] Through the above design, this scheme can more conveniently control the switch of the air inlet valve. When in use, the motor starts, the shaft rotates, and then the flap is rotated. When the axis of the flap does not coincide with the axis of the air inlet transverse duct, the air inlet transverse duct is connected with the outside world, that is, natural wind enters the air inlet transverse duct. The amount of air intake is determined by the angle at which the motor rotates the flap (the opening and closing size of the flap). When the flap is flipped to a horizontal state, the degree of conduction between the air inlet transverse duct and the outside world is the greatest.

[0011] In a further improvement of the present invention, an upper sealing half ring is arranged on the outer side of the upper edge of the above-mentioned flap, and a lower sealing half ring is arranged on the inner side of the lower edge of the flap; or an upper sealing half ring is arranged on the inner side of the upper edge of the flap, and a lower sealing half ring is arranged on the outer side of the lower edge of the flap.

[0012] Through the above design, this scheme can more easily improve the sealing performance of the air inlet transverse duct when it is not connected to the outside world; the position setting of the upper sealing half ring and the lower sealing half ring is determined by the forward and reverse rotation of the motor, that is, when the upper sealing half ring is set on the outer side of the upper edge of the flap and the lower sealing half ring is set on the inner side of the lower edge of the flap, the motor needs to rotate clockwise; when the upper sealing half ring is set on the inner side of the upper edge of the flap and the lower sealing half ring is set on the outer side of the lower edge of the flap, the motor needs to rotate counterclockwise, and the upper sealing half ring and the lower sealing half ring can be welded to the inner wall of the air inlet transverse duct.

[0013] In a further improvement of the present invention, the drying layer comprises a plurality of filter screens embedded in the air inlet transverse duct, and desiccants are arranged between adjacent filter screens.

[0014] Through the above design, this solution can be more convenient for drying natural wind.

[0015] In a further improvement of the present invention, the above-mentioned lower air door mechanism includes a mounting hole plate arranged at the bottom of the outer cabinet, an exhaust fan is arranged at the bottom of the mounting hole plate, and an exhaust valve is arranged at the bottom of the exhaust fan; the exhaust valve includes an H frame arranged horizontally at the bottom of the exhaust fan, and the left and right sides of the H frame are respectively slidably connected with a sealing plate, and the sealing plate is connected to an electric push rod.

[0016] Through the above design, this solution can be more convenient for exhaust. When in use, the electric push rod controls the extension and retraction of the sealing plate, thereby connecting and disconnecting the inner cavity of the outer cabinet and the cable well. After the air in the outer cabinet passes through the installed orifice plate, it is exhausted to the cable well by the exhaust fan. The H frame can be welded to the bottom of the outer cabinet.

[0017] In a further improvement of the present invention, the left and right sides of the H frame are respectively provided with sliding grooves slidably connected to the sealing plate, and the middle part of the H frame is provided with a cable routing hole.

[0018] Through the above design, this solution can facilitate the sliding of the sealing plate. When in use, the electric push rod pushes the sealing plate to slide back and forth in the slide groove, and the cable routing hole is used to guide the cables in the cable well into the outer cabinet.

[0019] In a further improvement of the present invention, a mounting countersunk hole is arranged in the middle of the mounting seat, and the left and right ends of the mounting countersunk hole are respectively connected to a sealing plate sliding cavity, and the sealing plate sliding cavity is connected to a push rod cavity, and an electric push rod is installed in the push rod cavity; the outer cabinet is installed in the mounting countersunk hole.

[0020] Through the above design, this solution can facilitate the movement of the sealing plate. When in use, the electric push rod pushes the sealing plate to slide back and forth in the sealing plate sliding cavity and the sliding groove.

[0021] In a further improvement of the present invention, it also includes a control device, which includes a controller arranged in the inner cavity of the outer cabinet, an outer cabinet humidity sensor and an outer cabinet temperature sensor, and a cable well humidity sensor and a cable well temperature sensor arranged in the cable well; the controller is respectively connected to the outer cabinet humidity sensor, the outer cabinet temperature sensor, the cable well humidity sensor, the cable well temperature sensor, the air intake fan, the motor, the exhaust fan and the electric push rod.

[0022] Through the above design, this solution can be more convenient for automatic operation. When in use, the outer cabinet humidity sensor and the outer cabinet temperature sensor feed back the humidity and temperature in the outer cabinet to the controller, and the cable well humidity sensor and the cable well temperature sensor feed back the humidity and temperature in the cable well to the controller. The controller determines whether the humidity and temperature in the outer cabinet exceed the standard based on the feedback data, and then controls the operation of the upper air door mechanism and the lower air door mechanism to introduce dry natural wind from the outside, and discharges the moisture in the outer cabinet to the ground after passing through the cable well and the exhaust duct.

[0023] An anti-condensation method for an anti-condensation ring network cabinet comprises the following steps:

[0024] (1) When the humidity and temperature of the inner cavity of the outer cabinet of the ring main unit exceed the standard, the controller controls the inlet fan, motor, exhaust fan and electric push rod to start, and the external natural wind enters the inner cavity of the outer cabinet after being dried by the drying layer. The air in the inner cavity of the outer cabinet enters the cable well after being exhausted by the exhaust fan, and then passes through the cable well through the exhaust channel and is discharged to the ground environment, thus forming an airflow circulation from top to bottom;

[0025] (2) After the humidity and temperature of the inner cavity of the outer cabinet of the ring main unit are stabilized, the controller controls the air inlet fan, motor, exhaust fan and electric push rod to be turned off, and the inner cavity of the outer cabinet of the ring main unit is again in a sealed state with no air circulation.

[0026] Through the above design, this solution can be more easily implemented.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention is specially designed for ring network cabinets. This scheme abandons the traditional dehumidifier anti-condensation method and designs a circulating airflow that enters from top to bottom for the inner cavity of the outer cabinet of the ring network cabinet. It uses the upper air door mechanism, the inner cavity of the outer cabinet, the lower air door mechanism, the cable well and the exhaust duct that are connected in sequence to introduce dry natural wind from the outside, and discharges the moisture in the outer cabinet to the ground through the cable well and the exhaust duct, so as to prevent the water vapor in the cable well from entering the inner cavity of the outer cabinet of the ring network cabinet to form condensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the background technology or the technical solution of the present invention, the following briefly introduces the drawings used in conjunction with the prior art or specific implementation methods; obviously, the structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the restrictive conditions under which the present invention can be implemented, so they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0030] Figure 1 It is a structural schematic diagram of a specific implementation mode of the present invention.

[0031] Figure 2 It is a schematic cross-sectional structure diagram of a specific implementation mode of the present invention.

[0032] Figure 3 It is a structural schematic diagram of the air door mechanism in a specific embodiment of the present invention.

[0033] Figure 4 It is a structural schematic diagram of the damper mechanism according to a specific embodiment of the present invention.

[0034] Figure 5 It is a schematic structural diagram of a mounting base according to a specific embodiment of the present invention.

[0035] Figure 6 It is a schematic diagram of the inner cavity structure of the mounting base according to a specific embodiment of the present invention.

[0036] Figure 7 It is a schematic diagram of the operating status of a specific implementation mode of the present invention.

[0037] As shown in the figure: 1-external cabinet; 2-ring main body; 3-mounting seat; 4-air inlet horizontal pipe; 5-air inlet vertical pipe; 6-cone-shaped pipe; 7-inlet fan; 8-mounting pipe; 9-flap; 10-motor; 11-upper sealing half ring; 12-lower sealing half ring; 13-filter; 14-mounting hole plate; 141-cable routing hole on the mounting hole plate; 15-exhaust fan; 16-H frame; 17-slide; 18-sealing plate; 19-electric push rod; 20-cable routing hole; 21-mounting countersunk hole; 22-sealing plate sliding cavity; 23-push rod cavity; 24-controller; 25-external cabinet humidity sensor; 26-external cabinet temperature sensor; 27-cable well humidity sensor; 28-cable well temperature sensor; 29-cable well; 30-exhaust duct; 31-natural wind. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative work should fall within the scope of protection of the present invention.

[0039] At the same time, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like cited in this specification to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0040] At the same time, in the description of this specification, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0041] like Figure 1-7As shown, an anti-condensation ring network cabinet comprises an outer cabinet 1 and a ring network cabinet body 2 arranged in the outer cabinet 1, a mounting seat 3 is arranged at the bottom of the outer cabinet 1, a cable well 29 is arranged at the bottom of the mounting seat 3, an upper air door mechanism connected with the inner cavity of the outer cabinet 1 is arranged at the top of the outer cabinet 1, a lower air door mechanism connected with the inner cavity of the outer cabinet 1 is arranged at the bottom of the outer cabinet 1, the lower air door mechanism is connected with the cable well 29, the cable well 29 is connected with an exhaust channel 30, the exhaust channel 30 is connected with the ground, the exhaust channel 30 can be formed by expanding the cable routing channel connected with the cable well, or can be excavated separately, and the user can choose according to the actual working conditions.

[0042] In high temperature seasons or when the power load is large, the cables in the cable trench below the outer cabinet of the ring main unit heat up severely, and the moisture in the cable trench evaporates and turns into water vapor, which enters the inner cavity of the outer cabinet along the cable routing holes below, and forms condensation in the ring main unit body inside the inner cavity of the outer cabinet. Condensation will not only cause creepage and flashover accidents, affecting the insulation performance and service life of the equipment, but also cause major safety accidents when the discharge is serious.

[0043] The traditional method is to install a dehumidifier inside the external cabinet and the ring network cabinet to reduce the moisture in the air inside the cabinet and reduce the air humidity inside the cabinet. However, when a large amount of water vapor enters the cabinet, the dehumidification effect of the dehumidifier is very unobvious.

[0044] Therefore, the design concept of the present application is to overcome the inherent idea of ​​the current cable well-external cabinet-external airflow path, and creatively improve it to the outside world-external cabinet-cable well, introduce dry natural wind from the outside, and discharge the air in the external cabinet to the ground through the cable well and the exhaust duct, so as to prevent the water vapor and moisture in the cable well from entering the inner cavity of the external cabinet of the ring network cabinet. The air in the cable well is more humid than the outside air. Therefore, the wind flow circulation from bottom to top will cause more water vapor and moisture in the external cabinet even if a drying layer is set at the bottom of the external cabinet, and finally form condensation. The wind flow circulation from top to bottom of the present application can, on the one hand, introduce dry wind from the outside into the external cabinet, and on the other hand, reverse the wind flow from the cable well to the external cabinet, so as to prevent the air from the cable well from entering the external cabinet.

[0045] Among them, Figure 2 and 3 As shown, the upper air door mechanism includes an air inlet transverse duct 4 with air inlet valves at both ends, the middle of the air inlet transverse duct 4 is connected with an air inlet vertical duct 5, the air inlet vertical duct 5 passes through the top of the outer cabinet 1 and is connected with a truncated cone-shaped tube 6, an air inlet fan 7 is provided at the outlet end of the truncated cone-shaped tube 6, and the air inlet fan 7 is located in the outer cabinet; a drying layer is provided in the air inlet transverse duct 4; when in use, natural wind 31 enters the air inlet transverse duct 4 through the air inlet valve, enters the air inlet vertical duct 5 after being dried by the drying layer, and is discharged into the inner cavity of the outer cabinet 1 by the air inlet fan 7 after passing through the air inlet vertical duct 5 and the truncated cone-shaped tube 6.

[0046] Among them, Figure 3As shown, the air inlet valve includes a mounting tube 8 connected to the air inlet transverse duct 4, a flap 9 is arranged in the mounting tube 8, the flap 9 is connected to a rotating shaft, the rotating shaft passes through a bearing embedded in the tube wall of the mounting tube 8 and is connected to a motor 10, and the motor 10 is mounted on the outer top of the outer cabinet 1; the mounting tube 8 and the motor 10 can be welded or threadedly connected to the outer top of the outer cabinet 1. When in use, the motor 10 runs, the rotating shaft rotates, and the flap 9 rotates, thereby opening and closing the air inlet transverse duct 4 and the outside world.

[0047] Among them, Figure 3 As shown, an upper sealing semi-ring 11 is arranged on the outer side of the upper edge of the flap 9, and a lower sealing semi-ring 12 is arranged on the inner side of the lower edge of the flap 9; or an upper sealing semi-ring 11 is arranged on the inner side of the upper edge of the flap 9, and a lower sealing semi-ring 12 is arranged on the outer side of the lower edge of the flap 9. The arrangement of the upper sealing semi-ring 11 and the lower sealing semi-ring 12 can facilitate improving the sealing performance when the air inlet cross duct is not connected to the outside.

[0048] The drying layer includes a plurality of filter screens 13 embedded in the air inlet duct 4 , and desiccants are arranged between adjacent filter screens 13 .

[0049] Among them, Figure 4 As shown, the lower air door mechanism includes a mounting hole plate 14 arranged at the bottom of the outer cabinet 1, an exhaust fan 15 is arranged at the bottom of the mounting hole plate 14, and an exhaust valve is arranged at the bottom of the exhaust fan 15; the exhaust valve includes an H frame 16 arranged horizontally at the bottom of the exhaust fan 15, and the left and right sides of the H frame 16 are respectively slidably connected with a sealing plate 18, and the sealing plate 18 is connected to an electric push rod 19. When in use, the electric push rod pushes the sealing plate to slide and retract, thereby closing the vent on the mounting hole plate 14, that is, opening and closing the inner cavity of the outer cabinet and the cable well.

[0050] Among them, the left and right sides of the H frame 16 are respectively provided with sliding grooves 17 slidably connected to the sealing plate 18, and the middle part of the H frame 16 is provided with a cable routing hole 20; the mounting hole plate 14 is also provided with a cable routing hole 141 at a position opposite to the cable routing hole 20. When in use, the cable enters the outer cabinet after passing through the cable routing holes 20 and 141. After the cable is routed, pay attention to apply sealant to the cable routing hole to ensure the sealing of the inner cavity of the outer cabinet.

[0051] Among them, Figure 5 and 6 As shown, a mounting countersunk hole 21 is arranged in the middle of the mounting seat 3, and the left and right ends of the mounting countersunk hole 21 are respectively connected with a sealing plate sliding cavity 22, and the sealing plate sliding cavity 22 is connected with a push rod cavity 23, and an electric push rod 19 is installed in the push rod cavity 23; the outer cabinet 1 is installed in the mounting countersunk hole 21, and the mounting countersunk hole 21 is a rectangular countersunk hole, and the outer cabinet is installed on the upper side of the rectangular countersunk hole, and the sealing plate sliding cavity 22 is a movable cavity of the sealing plate, which is convenient for the extension and retraction of the sealing plate, and the push rod cavity 23 is used to install the electric push rod 19.

[0052] Among them, the ring network cabinet also includes a control device, which includes a controller 24 arranged in the inner cavity of the outer cabinet 1, an outer cabinet humidity sensor 25 and an outer cabinet temperature sensor 26, and a cable well humidity sensor 27 and a cable well temperature sensor 28 arranged in the cable well 29; the controller 24 is respectively connected to the outer cabinet humidity sensor 25, the outer cabinet temperature sensor 26, the cable well humidity sensor 27, the cable well temperature sensor 28, the air inlet fan 7, the motor 10, the exhaust fan 15 and the electric push rod 19.

[0053] This solution can run automatically. When in use, the outer cabinet humidity sensor and the outer cabinet temperature sensor will feed back the humidity and temperature in the outer cabinet to the controller, and the cable well humidity sensor and the cable well temperature sensor will feed back the humidity and temperature in the cable well to the controller. The controller determines whether the humidity in the outer cabinet exceeds the standard based on the feedback data, and then controls the operation of the upper air door mechanism and the lower air door mechanism to introduce dry natural wind from the outside, and discharge the moisture in the outer cabinet to the ground after passing through the cable well.

[0054] Among them, an anti-condensation method for an anti-condensation ring network cabinet comprises the following steps:

[0055] (1) When the humidity and temperature of the inner cavity of the outer cabinet 1 of the ring main unit exceed the standard, the controller 24 controls the inlet fan 7, the motor 10, the exhaust fan 15 and the electric push rod 19 to start, and the external natural wind 31 enters the inner cavity of the outer cabinet 1 after being dried by the drying layer. The air in the inner cavity of the outer cabinet 1 is drawn by the exhaust fan 15 and enters the cable well 29. After passing through the cable well 29, it passes through the exhaust duct 30 and is discharged to the ground environment, thus forming an upper-in and lower-out wind flow circulation;

[0056] (2) After the humidity and temperature of the inner cavity of the outer cabinet 1 of the ring main unit are stabilized, the controller 24 controls the inlet fan 7, the motor 10, the exhaust fan 15 and the electric push rod 19 to be turned off, and the inner cavity of the outer cabinet 1 of the ring main unit is in a sealed state with no air circulation again.

[0057] Although the present invention has been described in detail with reference to the accompanying drawings and in combination with preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, ordinary technicians in the field can make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions should all be within the scope of the present invention. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should all be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An anti-condensation ring main unit, comprising an outer cabinet and a ring main unit body arranged in the outer cabinet, wherein a mounting seat is arranged at the bottom of the outer cabinet, and a cable well is arranged at the bottom of the mounting seat, characterized in that: The top of the outer cabinet is provided with an upper air door mechanism connected to the inner cavity of the outer cabinet, and the bottom of the outer cabinet is provided with a lower air door mechanism connected to the inner cavity of the outer cabinet, the lower air door mechanism is connected to the cable well, and the cable well is connected to an exhaust channel; The upper air door mechanism comprises an air inlet horizontal pipe with air inlet valves at both ends, the middle of the air inlet horizontal pipe is connected with an air inlet vertical pipe, the air inlet vertical pipe passes through the top of the outer cabinet and is connected with a truncated cone-shaped pipe, and an air inlet fan is arranged at the outlet end of the truncated cone-shaped pipe; a drying layer is arranged in the air inlet horizontal pipe; The air inlet valve comprises a mounting tube connected to the air inlet transverse tube, a flap is arranged in the mounting tube, the flap is connected to a rotating shaft, the rotating shaft passes through a bearing embedded on the wall of the mounting tube and is connected to a motor, and the motor is mounted on the outer top of the outer cabinet; An upper sealing half ring is arranged on the outer side of the upper edge of the flap, and a lower sealing half ring is arranged on the inner side of the lower edge of the flap; or an upper sealing half ring is arranged on the inner side of the upper edge of the flap, and a lower sealing half ring is arranged on the outer side of the lower edge of the flap.

2. The anti-condensation ring main unit according to claim 1, characterized in that: The drying layer comprises a plurality of filter screens embedded in the air inlet transverse pipe, and desiccants are arranged between adjacent filter screens.

3. The anti-condensation ring main unit according to claim 1, characterized in that: The lower air door mechanism includes a mounting hole plate arranged at the bottom of the outer cabinet, an exhaust fan is arranged at the bottom of the mounting hole plate, and an exhaust valve is arranged at the bottom of the exhaust fan; the exhaust valve includes an H frame arranged horizontally at the bottom of the exhaust fan, and the left and right sides of the H frame are respectively slidably connected with a sealing plate, and the sealing plate is connected to an electric push rod.

4. The anti-condensation ring main unit according to claim 3, characterized in that: The left and right sides of the H frame are respectively provided with sliding grooves slidably connected to the sealing plate, and the middle part of the H frame is provided with a cable routing hole.

5. The anti-condensation ring main unit according to claim 4, characterized in that: A mounting countersunk hole is arranged in the middle of the mounting seat, and the left and right ends of the mounting countersunk hole are respectively connected with a sealing plate sliding cavity, and the sealing plate sliding cavity is connected with a push rod cavity, and an electric push rod is installed in the push rod cavity; the outer cabinet is installed in the mounting countersunk hole.

6. The anti-condensation ring main unit according to claim 5, characterized in that: It also includes a control device, which includes a controller arranged in the inner cavity of the outer cabinet, an outer cabinet humidity sensor and an outer cabinet temperature sensor, and a cable well humidity sensor and a cable well temperature sensor arranged in the cable well; the controller is respectively connected to the outer cabinet humidity sensor, the outer cabinet temperature sensor, the cable well humidity sensor, the cable well temperature sensor, the air intake fan, the motor, the exhaust fan and the electric push rod.

7. A method for preventing condensation of an anti-condensation ring network cabinet, characterized in that: The anti-condensation ring main unit according to claim 1 comprises the following steps: (1) When the humidity and temperature of the inner cavity of the outer cabinet of the ring main unit exceed the standard, the controller controls the inlet fan, motor, exhaust fan and electric push rod to start, and the external natural wind enters the inner cavity of the outer cabinet after being dried by the drying layer. The air in the inner cavity of the outer cabinet enters the cable well after being exhausted by the exhaust fan, and then passes through the cable well through the exhaust duct and is discharged to the ground environment, thus forming an airflow circulation from top to bottom; (2) After the humidity and temperature of the inner cavity of the outer cabinet of the ring main unit are stabilized, the controller controls the air inlet fan, motor, exhaust fan and electric push rod to be turned off, and the inner cavity of the outer cabinet of the ring main unit is in a sealed state with no air circulation again.

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