A desiccant reduction device for an electrical distribution box

Abstract

The utility model relates to a kind of desiccant reduction device for distribution box, including mounting bracket, reduction bin, desiccant bin, humidity sensor, air inlet pipe and exhaust pipe;Reduction bin is installed on mounting bracket, and reduction bin has a heating cavity, and heating wire is arranged in heating cavity;The side wall of reduction bin is provided with dry window for gas exchange with distribution box;Desiccant bin is arranged in reduction bin, and desiccant bin is provided with the desiccant that can be heated and reduced, and a plurality of air holes are formed in desiccant bin;One end of air inlet pipe is communicated with reduction bin, and the other end is communicated to outside;One end of exhaust pipe is communicated with reduction bin, and the other end is communicated to outside, and fan and electric control valve are arranged on air inlet pipe and exhaust pipe;Humidity sensor is installed on mounting bracket and located in distribution box.When humidity sensor detects that humidity in distribution box is abnormally increased, heating wire, fan and electric control valve are opened, and desiccant is heated and reduced, so that the continuous effect of moisture-proof of desiccant is ensured.

Description

Technical Field

[0001] This utility model relates to the field of distribution box technology, and specifically to a desiccant reduction device for distribution boxes. Background Technology

[0002] Moisture is an inherent characteristic of underground spaces, and the hot and humid environment of underground engineering projects has a significant impact on the reliability of electrical equipment. For electrical equipment used in high-humidity environments, both domestically and internationally, many distribution boxes with concentrated distribution of common switching devices are currently equipped with overall moisture protection. In some implementations, moisture-proofing devices such as heating wires to dry the equipment are used to reduce the humidity inside the box. However, after the moisture-proofing device stops operating, the relative humidity inside the box will increase again, which can lead to condensation and accelerate the corrosion of electrical equipment. On the other hand, keeping the moisture-proofing components continuously running will result in a large amount of energy consumption.

[0003] In other implementations, desiccant boxes are installed in the electrical distribution boxes to absorb moisture and prevent dampness. However, the moisture-absorbing capacity of desiccants is time-limited and requires periodic replacement. Desiccant replacement typically relies on regular manual inspections, resulting in high maintenance costs, and is particularly cumbersome in underground environments where frequent inspections are inconvenient.

[0004] Therefore, it is necessary to study a desiccant reduction device for distribution boxes. Utility Model Content

[0005] Therefore, the purpose of this utility model is to provide a desiccant reduction device for distribution boxes, which can effectively solve the problems of frequent turning on the heating wire and fan when using heating wire for drying, and frequent replacement of desiccant when using desiccant for moisture prevention.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A desiccant reduction device for a distribution box includes a mounting frame, a reduction chamber, a desiccant chamber, a humidity sensor, an air inlet pipe, and an air outlet pipe;

[0008] The reduction chamber is mounted on the mounting frame and has a heating chamber containing a heating wire.

[0009] The side wall of the reduction chamber is provided with a drying window for gas exchange with the distribution box;

[0010] The desiccant chamber is located in the reduction chamber. The desiccant chamber contains a heatable desiccant that can be reduced. The desiccant chamber has several ventilation holes.

[0011] One end of the air inlet pipe is connected to the reduction chamber, and the other end is connected to the outside.

[0012] One end of the exhaust pipe is connected to the reduction chamber, and the other end is connected to the outside. Both the air inlet pipe and the exhaust pipe are equipped with fans and electrically controlled valves.

[0013] The humidity sensor is mounted on a mounting bracket and located inside the power distribution box; the humidity sensor, heating wire, fan, and electric control valve are all connected to the controller.

[0014] Furthermore, it also includes curved baffles;

[0015] The reduction chamber has a cylindrical structure;

[0016] The arc-shaped baffle is adapted to fit the side wall of the reduction chamber, and the size of the arc-shaped baffle is larger than the size of the drying window;

[0017] The curved baffle rotates along the side wall of the reduction chamber via a rotating assembly to open or close the drying window.

[0018] Furthermore, the rotating assembly includes a rotating shaft, a motor, and a connecting rod;

[0019] The rotating shaft is coaxially mounted at the bottom of the reduction chamber;

[0020] The motor is fixedly connected to the mounting bracket, and the output shaft of the motor is connected to the rotating shaft via a transmission connection.

[0021] One end of the connecting rod is fixedly connected to the rotating shaft, and the other end is fixedly connected to the bottom of the arc-shaped baffle.

[0022] Furthermore, a rotating ring is fixedly connected to the top of the arc-shaped baffle, and the limiting ring is rotatably sleeved on the outer wall of the reduction chamber.

[0023] Furthermore, both the reduction chamber and the desiccant chamber are cylindrical structures, and the desiccant chamber includes a lower cover and a storage compartment;

[0024] The lower cover is threadedly connected to the reduction chamber, the desiccant is placed inside the placement chamber, and the vent is opened on the placement chamber.

[0025] The top and bottom cover of the placement compartment are detachably connected.

[0026] Furthermore, the desiccant compartment also includes a top cover;

[0027] The top of the lower cover has a placement hole, and a placement ring is fixed to the placement hole;

[0028] The top of the placement compartment is fixed with a limiting ring, and the limiting ring is connected to the placement ring by overlapping.

[0029] The upper cover is threadedly connected to the placement ring, and the limiting ring is pressed and fixed on the placement ring.

[0030] Furthermore, the drying window includes a drying opening on the desiccant compartment and a breathable mesh fixed to the drying opening.

[0031] The beneficial effects of the above technical solution are:

[0032] This invention places the desiccant chamber within a reduction chamber, which contains a heatable desiccant for drying and reduction. The reduction chamber is equipped with a heating wire, an air inlet duct, and an exhaust duct. When the humidity sensor detects an abnormal increase in humidity within the distribution box, the controller energizes the heating wire to heat and reduce the desiccant. Simultaneously, the fans and electrically controlled valves on the air inlet and exhaust ducts open, forming an external circulation airflow path. This achieves rapid heating and reduction of the desiccant and removes the moisture generated during the reduction process, thereby restoring the desiccant's moisture-absorbing capacity and allowing it to be used for the next round of moisture protection. This avoids frequent desiccant replacements and manual inspections, effectively reducing maintenance costs and ensuring the continuous moisture-proof effect of the desiccant, thus improving the moisture-proof performance. Furthermore, the automatic activation of heating and dehumidification to reduce the desiccant only when the humidity exceeds the limit effectively reduces energy consumption and avoids energy waste caused by frequent operation of the heating wire and fan, further reducing costs. Attached Figure Description

[0033] Figure 1 A three-dimensional schematic diagram of the power distribution cabinet using this utility model;

[0034] Figure 2 for Figure 1 The front view;

[0035] Figure 3 This is a three-dimensional schematic diagram of the drying and reduction apparatus;

[0036] Figure 4 for Figure 3 The right view;

[0037] Figure 5 for Figure 3 A sectional view.

[0038] Attached reference numerals: 1 is mounting bracket, 2 is reduction chamber, 3 is desiccant chamber, 4 is humidity sensor, 5 is air inlet pipe, 6 is air outlet pipe, 7 is heating wire, 8 is fan, 9 is electric control valve, 10 is distribution box, 11 is arc-shaped baffle, 12 is rotating shaft, 13 is motor, 14 is connecting rod, 15 is rotating ring, 201 is heating chamber, 202 is drying window, 203 is vent mesh, 301 is lower cover, 302 is placement chamber, 303 is placement ring, 304 is limiting ring, 305 is upper cover, 306 is vent hole. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0040] This embodiment aims to provide a desiccant reduction device for electrical distribution boxes, which is mainly used for the drying process of electrical distribution boxes. It addresses the problems of frequent operation of heating wires and fans when using heating wires for drying, and frequent replacement of desiccants when using desiccants for moisture prevention.

[0041] A desiccant reduction device for a distribution box, such as Figures 1-3 It includes a mounting bracket 1, a reduction chamber 2, a desiccant chamber 3, a humidity sensor 4, an air inlet duct 5, and an air outlet duct 6. The mounting bracket 1 is mainly used for fixed connection with the inner wall of the distribution box 10 and provides a fixed base for other components.

[0042] The reduction chamber 2 has a cylindrical structure, and its outer wall is fixed to the mounting frame 1 via a connecting plate. Figure 5 The reduction chamber 2 has a heating cavity 201 with an upper opening, and the upper opening of the reduction chamber 2 is provided with an external thread; a heating wire 7 is provided in the heating cavity 201.

[0043] The side wall of the reduction chamber 2 is provided with a drying window 202 for gas exchange with the distribution box 10. Specifically, the drying window 202 includes a drying port on the desiccant chamber 3, and a ventilated mesh 203 is provided on the drying port to facilitate the exchange of air in the distribution box 10 with the gas in the reduction chamber 2, thereby allowing the desiccant to absorb moisture and dry. In other embodiments, the drying window 202 may also be a plurality of ventilation holes centrally located.

[0044] A desiccant chamber 3 is located within a reduction chamber 2. The desiccant chamber contains a heatable desiccant, such as a molecular sieve desiccant. Several vent holes 306 communicating with the reduction chamber 2 are provided on the desiccant chamber 3. Specifically, the desiccant chamber 3 has a cylindrical structure and includes a lower cover 301, a placement chamber 302, and an upper cover 305. The lower cover 301 is threadedly connected to the reduction chamber 2. The placement chamber 302 is used to hold the desiccant, and the vent holes 306 are located on the placement chamber 302. A placement hole is provided on the top of the lower cover 301, and a placement ring 303 is coaxially fixed to the placement hole. The outer wall of the placement ring 303 is provided with external threads.

[0045] The top of the placement chamber 302 is integrally formed with an outwardly expanding limiting ring 304, which overlaps with the placement ring 303. The upper cover 305 is threadedly connected to the placement ring 303, and presses and fixes the limiting ring 304 onto the placement ring 303. When it is necessary to inspect or replace the desiccant, the threaded connection between the lower cover 301 and the reduction chamber 2 can be released to remove the desiccant chamber 3. Then, the threaded connection between the upper cover 305 and the placement ring 303 can be released to remove the placement chamber 302 to replace the desiccant.

[0046] One end of the air inlet duct 5 is connected to the reduction chamber 2, and the other end is connected to the outside of the distribution box 10; one end of the exhaust duct 6 is connected to the reduction chamber 2, and the other end is connected to the outside of the distribution box 10. Both the air inlet duct 5 and the exhaust duct 6 are equipped with a fan 8 and an electrically controlled valve 9. The fan 8 on the air inlet duct 5 provides airflow towards the reduction chamber 2, and the fan 8 on the exhaust duct 6 provides airflow towards the outside of the distribution box 10, forming an external circulation airflow path. The electrically controlled valve 9 is used to open and close the corresponding air inlet duct 5 and exhaust duct 6 to isolate the reduction chamber 2 from the outside air of the distribution box 10 when external circulation is not required, preventing external moisture from entering the reduction chamber 2.

[0047] Humidity sensor 4 is mounted on mounting bracket 1 and located inside distribution box 10; humidity sensor 4, heating wire 7, fan 8 and electrically controlled valve 9 are all connected to the controller. The controller uses a single-chip microcomputer, which can be integrated into distribution box 10 or set separately on mounting bracket 1. Its specific structure and principle will not be described here.

[0048] Furthermore, such as Figure 3-5 It also includes an arc-shaped baffle 11. The drying window 202 is an arc-shaped window opened on the side wall of the reduction chamber 2; the arc-shaped baffle 11 is adapted to fit the side wall of the reduction chamber 2, and the size of the arc-shaped baffle 11 is larger than the size of the drying window 202; the arc-shaped baffle 11 rotates along the side wall of the reduction chamber 2 through a rotating assembly to open or close the drying window 202, so as to block the air flow between the power distribution cabinet and the reduction chamber 2 when the desiccant is being reduced.

[0049] like Figure 3-5 The rotating assembly includes a rotating shaft 12, a motor 13, and a connecting rod 14. The rotating shaft 12 is coaxially rotatably mounted at the bottom of the reduction chamber 2. The motor 13 is fixedly connected to the mounting frame 1 via a motor frame, and the output shaft of the motor 13 is coaxially connected to the rotating shaft 12 via a coupling. One end of the connecting rod 14 is fixedly connected to the rotating shaft 12, and the other end is fixedly connected to the bottom of the arc-shaped baffle 11, so that the motor 13 can drive the arc-shaped baffle 11 to rotate.

[0050] A rotating ring 15 is fixedly connected to the top of the arc-shaped baffle 11. The rotating ring 15 is rotatably sleeved on the outer wall of the reduction chamber 2 to provide additional support for the top of the arc-shaped baffle 11.

[0051] In this embodiment, during normal drying and moisture absorption, the arc-shaped baffle 11 is positioned at the initial stage where it does not obstruct the drying window 202. Both the air inlet pipe 5 and the air outlet pipe are kept closed by the electrically controlled valve 9, and the fan 8 is turned off. The air inside the distribution box 10 is dried by the desiccant through the drying window 202 and the vent 306. When the humidity sensor 4 detects that the humidity is continuously too high, the system enters the reduction mode. At this time, the heating wire 7 is turned on to release moisture during drying. The electrically controlled valve 9 and the fan 8 are turned on, so that the reduction chamber 2 and the external environment of the distribution box 10 form an external circulation to discharge the moisture released by the desiccant to the outside. The motor 13 rotates at a fixed angle, so that the arc-shaped baffle 11 rotates to close the drying window 202. The reduction mode will continue for a fixed reduction cycle, which can be set according to the empirical value obtained from experiments.

[0052] After the restoration mode ends, the device returns to the initial normal drying and dehumidification mode. The arc-shaped baffle 11 returns to its initial position, no longer obstructing the drying window 202. Both the air inlet duct 5 and the air outlet duct remain closed via the electrically controlled valve 9, the fan 8 is turned off, and the air inside the distribution box 10 is dried by the desiccant through the drying window 202 and the vent 306. However, if, for a period of time after the restoration mode ends, the humidity sensor 4 detects persistently high humidity data without any downward trend, the controller sends a signal to the control panel, prompting manual maintenance.

Claims

1. A desiccant reduction device for an electrical distribution box, comprising: The device comprises a mounting frame, a reduction bin, a drying agent bin, a humidity sensor, an air inlet pipe and an air outlet pipe. The reduction bin is mounted on the mounting frame and has a heating cavity with a heating wire arranged therein. A drying window for gas exchange with the distribution box is formed in the side wall of the reduction bin. The drying agent bin is arranged in the reduction bin and contains drying agents that can be heated for reduction. The air inlet pipe is in communication with the reduction bin at one end and with the outside of the distribution box at the other end. The air outlet pipe is in communication with the reduction bin at one end and with the outside of the distribution box at the other end. The humidity sensor is mounted on the mounting frame and located in the distribution box.

2. A desiccant restoration device for an electrical distribution box according to claim 1, wherein: The humidity sensor, the heating wire, the fan and the electric control valve are connected to the controller. The device further comprises an arc-shaped baffle. The reduction bin has a cylindrical structure. The drying window is an arc-shaped window formed in the side wall of the reduction bin.

3. A desiccant restoration device for an electrical distribution box according to claim 2, wherein: The arc-shaped baffle is adapted to the side wall of the reduction bin and has a size larger than that of the drying window. The arc-shaped baffle is rotatable along the side wall of the reduction bin via a rotating assembly to open or close the drying window. The rotating assembly comprises a rotating shaft, a motor and a connecting rod. The rotating shaft is coaxially arranged at the bottom of the reduction bin.

4. A desiccant restoration device for an electrical distribution box according to claim 2, wherein: The motor is fixedly connected to the mounting frame, and the output shaft of the motor is in transmission connection with the rotating shaft.

5. A desiccant reduction device for an electrical enclosure according to any of claims 1-4, wherein: One end of the connecting rod is fixedly connected to the rotating shaft, and the other end is fixedly connected to the bottom of the arc-shaped baffle. A rotating ring is fixedly connected to the top of the arc-shaped baffle, and a limiting ring is rotatably arranged on the outer wall of the reduction bin. The reduction bin and the drying agent bin both have a cylindrical structure. The lower cover is threadedly connected to the reduction bin. The drying agents are arranged in the placement bin. The top of the placement bin is detachably connected to the lower cover.

6. The drying agent reduction device for the distribution box according to claim 5, wherein: The drying agent bin further comprises an upper cover.

7. A desiccant reduction device for an electrical enclosure according to any one of claims 1-4, wherein: A placement hole is formed in the top of the lower cover, and a placement ring is fixedly arranged on the placement hole. The top of the placement bin is fixedly provided with a limiting ring, and the limiting ring is connected to the placement ring through clamping. The upper cover is threadedly connected to the placement ring and tightly fixes the limiting ring on the placement ring. The drying window comprises a drying port formed in the drying agent bin and a gas permeable net fixedly arranged on the drying port.

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