A dehumidifying device for ring main unit

Abstract

The application discloses a dehumidifying device for a ring main unit and belongs to the technical field of ring main units. When fixed fins and movable fins are in a parallel state, the fixed fins and the movable fins in a horizontal state can reduce air flow resistance, avoid vortex and pressure loss between adjacent fixed fins and movable fins, and maximize the spacing between adjacent fixed fins and movable fins in parallel, so that the resistance is reduced, and the purpose of avoiding high energy consumption of the fan is achieved. When the ring main unit is in a high flow condition, the air flow path is changed by offsetting the movable fins, so that the air flow forms multidirectional disturbance between adjacent movable fins. After the direction of the air flow is changed, the contact area and angle of air and the fins are increased, the thermal boundary layer is destroyed, and the air-side heat transfer coefficient is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of ring main units, in particular to a dehumidifying device for a ring main unit. BACKGROUND

[0002] As a core equipment in a power system, a ring main unit is prone to being affected by environmental humidity during long-term operation, which leads to the decline of insulation performance, metal corrosion, the increase of short-circuit risk and the rise of maintenance cost. In view of these problems, a dehumidifying device for a ring main unit reduces the humidity in the cabinet through physical or chemical methods, and becomes a key to ensure stable operation of the equipment.

[0003] Among them, the condensation dehumidification technology is a way of reducing humidity by condensing water vapor in the air into liquid water through a condenser and discharging it out of the cabinet. This way, humid air is condensed into water and directly discharged out of the cabinet by creating condensation conditions locally. This way has high dehumidification efficiency, but is sensitive to environmental temperature and is suitable for environments with large temperature differences, such as coastal or underground distribution rooms with high humidity and large temperature fluctuations.

[0004] As a core component of the condensation dehumidifying device, the heat dissipation efficiency of the condenser directly affects the dehumidification effect. If the heat dissipation is poor, it may lead to a decrease in refrigeration efficiency or even equipment failure. Generally, the number or area of fins of the condenser is increased to improve the heat dissipation efficiency.

[0005] However, in actual operation, due to the limited space inside the ring main unit, the number or area of fins cannot be increased, and due to the narrow space, the air flow resistance in the cabinet is large, and when the air flow is blocked, the heat exchange area of the fins cannot be fully utilized, which easily forms a local high temperature area and further reduces the heat dissipation efficiency. SUMMARY

[0006] The purpose of the present application is to solve the problem of limited space inside the ring main unit, which restricts the increase of the number or area of fins, and due to the narrow space, the air flow resistance in the cabinet is large, and when the air flow is blocked, the heat exchange area of the fins cannot be fully utilized, which easily forms a local high temperature area and further reduces the heat dissipation efficiency.

[0007] To achieve the above purpose, the application adopts the following technical solution: a dehumidifying device for a ring main unit.

[0008] The utility model relates to a dehumidifier, which comprises a dehumidifier body, a shell, a wind channel, a refrigeration system and a condensate pipeline fixedly installed in the shell, the wind channel comprises a fin mounting portion, and the fin mounting portion is provided with an air outlet and an air inlet at two ends respectively, characterized in that a condensing mechanism is arranged in the fin mounting portion, the condensing mechanism comprises a plurality of fixed fins installed in the fin mounting portion, the surface of the fixed fin is provided with a first through hole and a second through hole connected with the refrigeration system, and the condensate pipeline transports condensate to the fixed fin through the refrigeration system.

[0009] The end of the fixed fin is rotatably provided with a movable fin, one side of the fin mounting portion is provided with a deflection cavity for deflection of the movable fin, and when the deflection angle of the movable fin increases, the spacing between adjacent movable fins decreases to form a more dense flow channel, and the flow velocity in the flow channel locally increases.

[0010] As a further description of the above-mentioned technology, a dehumidifying device for a ring network cabinet is provided.

[0011] The inside of the fixed fin is provided with a first partition plate for separating the fixed fin, and the first partition plate is provided with a semicircular portion for plugging the first through hole and the second through hole, so that the condensate only enters and exits the fixed fin from the side of the first through hole and the second through hole that is not plugged.

[0012] The inside of the movable fin is provided with a second partition plate, and the end of the second partition plate is provided with an opening.

[0013] The fixed fin and the movable fin are in communication with each other, and the condensate circulates in the fixed fin and the movable fin along the first partition plate and the second partition plate.

[0014] As a further description of the above-mentioned technology, a dehumidifying device for a ring network cabinet is provided.

[0015] The end of the fixed fin is provided with two recesses, and the recesses are provided with connecting pipes, and the connecting pipes are slidably nested with rotatable internal thread sleeves.

[0016] The movable fin is provided with protrusions corresponding to the positions of the two recesses, and the protrusions are rotatably nested with rotating rings that are in mesh with the internal thread sleeves.

[0017] As a further description of the above-mentioned technology, a dehumidifying device for a ring network cabinet is provided.

[0018] The movable fin is controlled to deflect by a steering mechanism, the steering mechanism comprises a rotating member rotatably installed on the recess, and the surface of the rotating member is provided with a sealing gasket tightly fitted with the recess.

[0019] The bottom of the rotating member is provided with a connecting rod that penetrates the connecting pipe and the rotating ring in sequence, the end of the connecting rod is provided with an embedded part, and the protrusion is provided with an embedded groove for embedding the embedded part.

[0020] As a further description of the above-mentioned technology, a dehumidifying device for a ring main unit is provided:

[0021] The plurality of movable fins are synchronously deflected by a driving mechanism, which includes a driven wheel arranged on the rotating member and penetrating the fin mounting portion;

[0022] And the mounting shaft is fixedly mounted on the fin mounting portion, and a driving wheel is rotatably arranged on the surface of the mounting shaft.

[0023] As a further description of the above-mentioned technology, a dehumidifying device for a ring main unit is provided:

[0024] The mounting shaft is provided with a sliding groove, and the inner wall of the driving wheel is provided with a sliding block slidingly arranged in the sliding groove.

[0025] As a further description of the above-mentioned technology, a dehumidifying device for a ring main unit is provided:

[0026] The driving wheel is provided with a knob, and the knob is provided with a plug penetrating the positioning hole arranged on the surface of the driving wheel.

[0027] As a further description of the above-mentioned technology, a dehumidifying device for a ring main unit is provided:

[0028] The mounting shaft is provided with a ring-shaped movable cavity in the middle, and the movable cavity is provided with a guide rod in the middle.

[0029] As a further description of the above-mentioned technology, a dehumidifying device for a ring main unit is provided:

[0030] The plug slot is composed of at least two circular holes with the same radius and equidistantly arranged around the guide rod as the axis.

[0031] One of the above technical solutions has the following advantages or beneficial effects:

[0032] 1. By setting the condensing mechanism, when the fixed fin and the movable fin are in parallel state, the fixed fin and the movable fin in horizontal state can reduce the air flow resistance under the low flow rate working condition of the ring main unit, avoid vortex and pressure loss between adjacent fixed fin and movable fin, and the spacing between adjacent fixed fin and movable fin is maximum when they are parallel, so as to reduce the resistance and avoid the high energy consumption of fan, when the ring main unit is in high flow rate working condition, the air flow path is changed by offsetting the movable fin, so that the air flow forms multidirectional disturbance between adjacent movable fins, after the direction of air flow is changed, the contact area and angle of air and fin increase, the thermal boundary layer is destroyed, and the air side heat transfer coefficient is improved;

[0033] 2. By setting the turning mechanism, the rotating part drives the fitting part to rotate through the connecting rod, the fitting part drives the movable fin to rotate and offset through the fitting groove, after the multiple movable fins are deflected at the same time, the spacing between adjacent movable fins is reduced to form more dense flow channel, the air flow is forced to change direction in the narrow flow channel, the turbulence intensity is enhanced, the flow velocity in the flow channel is locally increased, the heat exchange weakening caused by insufficient flow velocity is compensated, so as to improve the heat transfer coefficient. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 A perspective sectional structure schematic diagram of a dehumidification device for ring main unit is shown;

[0035] Figure 2 A perspective structure schematic diagram of the fin of the condensing mechanism in horizontal state is shown;

[0036] Figure 3 A perspective sectional structure schematic diagram of the fin of the condensing mechanism in offset state is shown;

[0037] Figure 4 A front view sectional structure schematic diagram of the fin of the condensing mechanism in offset state is shown;

[0038] Figure 5 A perspective structure schematic diagram of the fin in horizontal state is shown;

[0039] Figure 6 A perspective sectional structure schematic diagram of the fin in horizontal state is shown;

[0040] Figure 7 A perspective structure schematic diagram of the fin in offset state is shown;

[0041] Figure 8 A flow direction schematic diagram of condensate in the fin is shown;

[0042] Figure 9 A perspective sectional structure schematic diagram of the turning mechanism is shown;

[0043] Figure 10 Fig. 3 shows a perspective view of the rotating member, connecting rod and fitting portion;

[0044] Figure 11 Fig. 4 shows a perspective view of the driving mechanism;

[0045] Figure 12 Fig. 5 shows a perspective view of the driving wheel and knob in the locked state;

[0046] Figure 13 Fig. 6 shows a perspective view of the driving wheel and knob in the active state;

[0047] Figure 14 Fig. 7 shows a front view of the installation shaft, driving wheel and knob;

[0048] Figure 15 Fig. 8 shows a perspective view of the installation shaft, driving wheel and knob;

[0049] Figure 16 Fig. 9 shows a perspective view of the installation shaft;

[0050] Figure 17 Fig. 10 shows a perspective view of the driving wheel.

[0051] Legend:

[0052] 10, dehumidifier body; 11, shell; 12, air duct; 121, fin mounting portion; 122, deflection cavity; 123, air outlet; 124, air inlet; 13, refrigeration system; 14, condensate pipe;

[0053] 20, condensing mechanism; 21, fixed fin; 211, recess; 212, first through hole; 213, second through hole; 214, first partition plate; 22, movable fin; 221, protrusion; 222, second partition plate; 23, connecting pipe; 24, internally threaded sleeve ring; 25, rotating ring;

[0054] 30, steering mechanism; 31, rotating member; 32, gasket; 33, connecting rod; 34, fitting portion; 35, fitting groove;

[0055] 40, driving mechanism; 41, driven wheel; 42, transmission belt; 43, installation shaft; 431, movable cavity; 432, guide rod; 433, sliding groove; 434, insertion slot; 44, driving wheel; 441, sliding block; 442, positioning hole; 45, knob; 451, sleeve rod; 452, spring; 453, latch. DETAILED DESCRIPTION

[0056] The following will describe in detail, with reference to the accompanying drawings of the embodiments of the present invention, a dehumidification device for a ring main unit according to the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0057] To address the limitations of limited internal space in ring main units, restricting the methods for increasing the number or area of ​​fins, and the high airflow resistance caused by the confined space, which leads to insufficient utilization of the fin heat exchange area and the formation of localized high-temperature zones, further reducing heat dissipation efficiency, this invention proposes a dehumidification device for ring main units, such as... Figure 1 - Figure 17 As shown:

[0058] It includes a dehumidifier body 10, which includes a housing 11, an air duct 12, a refrigeration system 13, and a condensate pipe 14 fixedly installed inside the housing 11;

[0059] The air duct 12 includes a fin mounting part 121, and an air outlet 123 and an air inlet 124 are respectively opened at both ends of the fin mounting part 121. A condensing mechanism 20 is provided inside the fin mounting part 121. The condensing mechanism 20 includes a plurality of fixed fins 21 installed in the fin mounting part 121. Preferably, the number of fixed fins 21 is not less than 50. The surface of the fixed fins 21 is provided with a first through hole 212 and a second through hole 213 connected to the refrigeration system 13. The condensate pipe 14 delivers condensate to the fixed fins 21 through the refrigeration system 13.

[0060] like Figures 5-8 As shown, a movable fin 22 is rotatably provided at the end of the fixed fin 21. A deflection cavity 122 for the movable fin 22 to deflect is provided on one side of the fin mounting part 121. A first partition plate 214 is provided inside the fixed fin 21 to separate the fixed fin 21. The first partition plate 214 is provided with a semi-circular part that blocks the first through hole 212 and the second through hole 213 respectively, so that the condensate enters and exits the fixed fin 21 only from the unblocked side of the first through hole 212 and the second through hole 213. A second partition plate 222 is provided inside the movable fin 22. An opening is provided at the end of the second partition plate 222. The fixed fin 21 and the movable fin 22 are in communication with each other.

[0061] like Figure 8 and Figure 9As shown, in order to facilitate the assembly of the fixed fin 21 and the movable fin 22, the fixed fin 21 is provided with two recesses 211 at its end. Each recess 211 is provided with a connecting tube 23. The connecting tube 23 is slidably nested with a rotatable internal threaded collar 24. The movable fin 22 is provided with a protrusion 221 corresponding to the position of the two recesses 211. A rotating ring 25 that meshes with the internal threaded collar 24 is rotatably embedded in the protrusion 221.

[0062] After placing the recess 211 of the fixed fin 21 in the position corresponding to the protrusion 221 of the movable fin 22, rotate and push the internal threaded collar 24, causing the internal threaded collar 24 to slide and rotate under the restriction of the connecting pipe 23 and engage with the rotating ring 25, so that the movable fin 22 can be rotatably mounted on the fixed fin 21. When the condensate is introduced into the fixed fin 21 through the condensate pipe 14 via the refrigeration system 13, the condensate first enters through the second through hole 213. Guided by the first partition plate 214, the condensate sequentially enters the movable fin 22 through the connecting pipe 23 and the rotating ring 25, and flows along the second partition plate 222. After passing through the opening of the second partition plate 222, the condensate passes through the rotating ring 25 on the other side again. The condensate is re-injected into the fixed fins 21 through the connecting pipe 23. Guided by the first partition plate 214, it flows back into the refrigeration system 13 through the first through hole 212 and reaches the next set of fixed fins 21 and movable fins 22. This cycle continues until the condensate flows through all the fixed fins 21 and movable fins 22. At this time, the fixed fins 21 and movable fins 22 are in a parallel state. Under low flow rate conditions, the horizontal fixed fins 21 and movable fins 22 can reduce airflow resistance and avoid eddies and pressure loss between adjacent fixed fins 21 and movable fins 22. Furthermore, the spacing between adjacent fixed fins 21 and movable fins 22 is the largest when they are parallel, thereby reducing resistance and avoiding excessive fan energy consumption.

[0063] In order to adjust the angle of the movable fin 22 and the distance between adjacent movable fins 22, such as Figure 9 and Figure 10 As shown, the movable fin 22 is deflected by the steering mechanism 30. The steering mechanism 30 includes a rotating part 31 rotatably mounted on the recess 211. A sealing gasket 32 ​​that fits tightly against the recess 211 is sleeved on the surface of the rotating part 31. A connecting rod 33 that passes through the connecting pipe 23 and the rotating ring 25 in sequence is provided at the bottom of the rotating part 31. A fitting part 34 is provided at the end of the connecting rod 33. A fitting groove 35 for the fitting part 34 to be inserted is provided in the protrusion 221.

[0064] After the fixed fin 21 and the movable fin 22 are assembled, a sealing gasket 32 ​​is fitted on the surface of the rotating part 31 and passes through the recess 211. The rotating part 31 is rotatably mounted on the recess 211. At this time, the rotating part 31 drives the fitting part 34 to be embedded in the fitting groove 35 through the connecting rod 33, thus completing the connection between the rotating part 31 and the movable fin 22.

[0065] When the ring main unit is operating at high flow rates, the horizontal fixed fins 21 and movable fins 22 can easily cause the airflow to flow along a fixed path and form local vortices, reducing the uniformity of air-fin contact. At this time, by rotating the rotating component 31, the rotating component 31 drives the fitting part 34 to rotate through the connecting rod 33. The fitting part 34 drives the movable fins 22 to rotate and shift through the fitting groove 35. When the offset angle of the movable fins 22 increases, the airflow path is changed, causing the airflow to form multi-directional disturbances between adjacent movable fins 22. After the airflow direction changes, the contact area and angle between the air and the fins increase, destroying the thermal boundary layer and improving the air-side heat transfer coefficient.

[0066] At the same time, after multiple movable fins 22 deflect simultaneously, the spacing between adjacent movable fins 22 decreases to form a denser flow channel. The airflow is forced to change direction in the narrow flow channel, which enhances the turbulence intensity. The flow velocity in the flow channel increases locally, which compensates for the weakening of heat transfer caused by insufficient flow velocity, thereby achieving the purpose of improving the heat transfer coefficient.

[0067] In order to synchronize the deflection of multiple movable fins 22, such as Figure 11 As shown, multiple movable fins 22 are synchronously deflected by a drive mechanism 40. The drive mechanism 40 includes a driven wheel 41 mounted on a rotating member 31 and passing through the fin mounting part 121, and a mounting shaft 43 fixedly mounted on the fin mounting part 121. A drive wheel 44 is rotatably mounted on the surface of the mounting shaft 43. A transmission belt 42 is meshed on multiple driven wheels 41 and the drive wheel 44. By rotating the drive wheel 44, the drive wheel 44 drives multiple driven wheels 41 to rotate synchronously under the restriction of the mounting shaft 43 via the transmission belt 42. Each driven wheel 41 drives its respective connected rotating member 31 to rotate, thereby achieving the purpose of synchronously controlling the deflection of multiple movable fins 22.

[0068] Furthermore, such as Figures 12-17 As shown, in order to achieve precise control of the deflection angle of the movable fin 22, and to lock the position of the movable fin 22 after deflection so that it cannot rotate on its own, a groove 433 is provided on the surface of the mounting shaft 43, and a slider 441 is provided on the inner wall of the drive wheel 44, which is slidably embedded in the groove 433. With this design, when the slider 441 is located at one end of the groove 433, the fixed fin 21 and the movable fin 22 are in a horizontal state, and when the slider 441 slides from one end of the groove 433 to the other end, the drive wheel 44 rotates to the maximum angle, and the deflection angle of the movable fin 22 is the maximum.

[0069] Preferably, a knob 45 is installed on the drive wheel 44. To facilitate the grip of the operator, several grooves are evenly spaced around the surface of the knob 45 to achieve the purpose of anti-slip. A pin 453 is provided on the knob 45, which passes through the positioning hole 442 opened on the surface of the drive wheel 44. A slot 434 that cooperates with the pin 453 is opened on the mounting shaft 43. An annular movable cavity 431 is opened in the middle of the mounting shaft 43, and a guide rod 432 is provided in the middle of the movable cavity 431. A sleeve rod 451 connected to the knob 45 is rotatably provided on the surface of the guide rod 432. A spring 452 is wound on the surface of the sleeve rod 451, and the two ends of the spring 452 abut against the sleeve rod 451 and the movable cavity 431 respectively.

[0070] When it is necessary to deflect the movable fin 22, by pulling the knob 45, the knob 45 drives the sleeve rod 451 to move in the movable cavity 431. The sleeve rod 451 is prevented from shifting position under the restriction of the guide rod 432, and when it moves, it cooperates with the inner wall of the movable cavity 431 to compress the spring 452. The spring 452 undergoes elastic deformation. At this time, the knob 45 drives the pin 453 to move out of the slot 434, and the locking of the mounting shaft 43 to the knob 45 is released. At this time, the knob 45 is rotated, so that the knob 45 drives the drive wheel 44 to rotate through the cooperation of the pin 453 and the positioning hole 442. The drive wheel 44 drives the slider 441 to rotate in the slide groove 433. The drive wheel 44 drives multiple movable fins 22 to deflect synchronously through the transmission belt 42 and the driven wheel 41.

[0071] After the movable fin 22 has deflected, the knob 45 is released. Under the push of the elastic deformation recovery of the spring 452, the knob 45 automatically resets. Since the slot 434 is composed of at least two circular holes of the same radius that are equidistantly connected around the guide rod 432, preferably nine in number, and the inner diameter of each circular hole is the same as the outer diameter of the pin 453, the knob 45 can drive the pin 453 to re-insert into the slot 434 and complete the fixation during the reset process.

[0072] Working principle:

[0073] Place the recess 211 of the fixed fin 21 at the position corresponding to the protrusion 221 of the movable fin 22, rotate and push the internal threaded collar 24 so that it slides and rotates under the restriction of the connecting pipe 23 and engages with the rotating ring 25, thus completing the rotational installation of the movable fin 22 on the fixed fin 21.

[0074] When the condensate is introduced into the fixed fin 21 through the condensate pipe 14 via the refrigeration system 13, the condensate first enters through the second through hole 213. Guided by the first partition plate 214, it sequentially enters the movable fin 22 through the connecting pipe 23 and the rotating ring 25. It flows along the second partition plate 222. After passing through the opening of the second partition plate 222, the condensate is reinjected into the fixed fin 21 through the rotating ring 25 and the connecting pipe 23 on the other side. Guided by the first partition plate 214, it flows back into the refrigeration system 13 through the first through hole 212 and reaches the next set of fixed fins 21 and movable fins 22. This cycle continues until it flows through all the fixed fins 21 and movable fins 22. At this time, the fixed fins 21 and movable fins 22 are in a parallel state, which is suitable for low flow rate conditions.

[0075] At high flow rates, the angle of the movable fins 22 needs to be adjusted. By pulling the knob 45, the knob 45 moves the sleeve rod 451 within the movable cavity 431. The sleeve rod 451 is prevented from shifting position by the guide rod 432, while simultaneously compressing the spring 452 to cause it to elastically deform. The knob 45 then moves the pin 453 out of the slot 434, releasing the locking of the knob 45 by the mounting shaft 43. Rotating the knob 45 causes the drive wheel 44 to rotate through the engagement of the pin 453 and the positioning hole 442. The drive wheel 44 then causes the slider 441 to rotate within the groove 433, which in turn drives multiple movable fins 22 to deflect synchronously via the transmission belt 42 and the driven wheel 41.

[0076] After the movable fin 22 has deflected, the knob 45 is released. Under the push of the elastic deformation recovery of the spring 452, the knob 45 automatically resets. Since the slot 434 is composed of at least two circular holes of the same radius that are equidistantly connected around the guide rod 432, the knob 45 drives the pin 453 to re-insert into the slot 434 during the reset process and completes the fixation.

[0077] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technology of the dehumidification device for ring main units and the inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A dehumidification device for a ring main unit, comprising a dehumidifier body (10), the dehumidifier body (10) comprising a housing (11), an air duct (12), a refrigeration system (13) and a condensate pipe (14) fixedly installed inside the housing (11), the air duct (12) comprising a fin mounting portion (121), and an air outlet (123) and an air inlet (124) respectively opened at both ends of the fin mounting portion (121), characterized in that, A condensing mechanism (20) is provided inside the fin mounting part (121). The condensing mechanism (20) includes a plurality of fixed fins (21) installed inside the fin mounting part (121). The surface of the fixed fins (21) is provided with a first through hole (212) and a second through hole (213) connected to the refrigeration system (13). The condensate pipe (14) delivers condensate to the fixed fins (21) through the refrigeration system (13). The fixed fin (21) is rotatably provided with a movable fin (22) at its end. A deflection cavity (122) for the movable fin (22) to deflect is provided on one side of the fin mounting part (121). When the offset angle of the movable fin (22) increases, the spacing between adjacent movable fins (22) decreases to form a denser flow channel, and the flow velocity in the flow channel increases locally.

2. The dehumidification device for a ring main unit according to claim 1, characterized in that, The fixed fin (21) is provided with a first partition plate (214) that separates the fixed fin (21), and the first partition plate (214) is provided with a semi-circular part that blocks the first through hole (212) and the second through hole (213), so that the condensate enters and exits the fixed fin (21) only from the unblocked side of the first through hole (212) and the second through hole (213). The movable fin (22) is provided with a second partition plate (222) inside, and the end of the second partition plate (222) is provided with an opening; The fixed fin (21) and the movable fin (22) are interconnected, and the condensate circulates between the fixed fin (21) and the movable fin (22) along the first partition plate (214) and the second partition plate (222).

3. The dehumidification device for a ring main unit according to claim 2, characterized in that, The fixed fin (21) has two recesses (211) at its end, and each recess (211) is provided with a connecting tube (23). The connecting tube (23) is slidably nested with a rotatable internal threaded collar (24). The movable fin (22) is provided with a protrusion (221) corresponding to the position of the two recesses (211), and a rotating ring (25) that meshes with the internal threaded collar (24) is rotatably embedded in the protrusion (221).

4. A dehumidification device for a ring main unit according to claim 3, characterized in that, The movable fin (22) is deflected by a steering mechanism (30). The steering mechanism (30) includes a rotating component (31) rotatably mounted on the recess (211). A sealing gasket (32) that fits tightly against the recess (211) is fitted on the surface of the rotating component (31). The bottom of the rotating part (31) is provided with a connecting rod (33) that passes through the connecting pipe (23) and the rotating ring (25) in sequence. The end of the connecting rod (33) is provided with a fitting part (34), and the protrusion (221) is provided with a fitting groove (35) for the fitting part (34) to be inserted.

5. A dehumidification device for a ring main unit according to claim 1, characterized in that, Multiple movable fins (22) are synchronously deflected by a drive mechanism (40), which includes a driven wheel (41) disposed on a rotating member (31) and passing through the fin mounting portion (121). In addition, a mounting shaft (43) is fixedly installed on the fin mounting part (121), and a drive wheel (44) is rotatably provided on the surface of the mounting shaft (43). A drive belt (42) is meshed on a plurality of driven wheels (41) and the drive wheel (44).

6. A dehumidification device for a ring main unit according to claim 5, characterized in that, The mounting shaft (43) has a groove (433) on its surface. The inner wall of the drive wheel (44) is provided with a slider (441) that is slidably embedded in the groove (433). When the slider (441) slides from one end of the groove (433) to the other end, the drive wheel (44) rotates to the maximum angle.

7. A dehumidification device for a ring main unit according to claim 6, characterized in that, A knob (45) is installed on the drive wheel (44), and a pin (453) is provided on the knob (45) through the positioning hole (442) opened on the surface of the drive wheel (44). A slot (434) is provided on the mounting shaft (43) to cooperate with the pin (453).

8. A dehumidification device for a ring main unit according to claim 7, characterized in that, The mounting shaft (43) has an annular movable cavity (431) in the middle, and a guide rod (432) is provided in the middle of the movable cavity (431). A sleeve rod (451) connected to the knob (45) is rotatably provided on the surface of the guide rod (432). A spring (452) is wound on the surface of the sleeve rod (451). The two ends of the spring (452) abut against the sleeve rod (451) and the movable cavity (431) respectively.

9. A dehumidification device for a ring main unit according to claim 7, characterized in that, The slot (434) is formed by connecting at least two circular holes of the same radius that are equidistantly arranged around the guide rod (432) as the axis, and the inner diameter of each circular hole is the same as the outer diameter of the pin (453).

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