Ring main unit with anti-condensation function

Abstract

The utility model relates to the technical field of ring main units, in particular to a ring main unit with an anti-condensation function. The ring main unit with the anti-condensation function comprises a cabinet body, the bottom of a cable bin arranged in the cabinet body is provided with a cable inlet used for leading in a cable, and a liquid blocking component is installed in the cable inlet. Compared with traditional fireproof mud and sealant, the ring main unit with the anti-condensation function provided by the utility model has the advantages that the annular elastic air bag is of an elastic structure, and the expanded annular elastic air bag can quickly fill a gap between the cable and the wire inlet pipe, so that the gap between the wire inlet pipe and the cable is sealed, and the service life of the ring main unit is prolonged. The hidden danger that moisture enters the cabinet body from a gap between the wire inlet pipe and the cable is reduced, and the annular elastic air bag of the elastic structure not only eliminates the problem of sealing failure of the annular elastic air bag caused by vibration of the cable or the cabinet body in the structural form, but also can adapt to cables with different diameters.

Description

Technical Field

[0001] This utility model relates to the field of ring main unit technology, and in particular to a ring main unit with anti-condensation function. Background Technology

[0002] A ring main unit is an electrical device consisting of a set of high-voltage switchgear installed in a metal or non-metal insulated cabinet or assembled into a modular ring main unit. Its core components are load switches and fuses. Because there are a large number of high-voltage switchgear inside existing ring main units, and the ring main units are prone to condensation of a large amount of dew during long-term operation, the dew condenses into water droplets, which can easily cause corrosion inside the ring main unit.

[0003] Typically, the cable compartment (cable chamber) at the bottom of a ring main unit requires a cable inlet to allow cables to enter the unit. Current technology uses fire-retardant putty or sealant to seal the cable inlet, reducing moisture entry. However, these materials are rigid after curing, making subsequent cable maintenance time-consuming and laborious, requiring repeated removal and resealing. This is inconvenient and time-consuming. Furthermore, sealing the cable inlet with fire-retardant putty or sealant can cause cracking due to cable or cabinet vibrations, leading to seal failure. Additionally, some ring main units use fixed activated carbon or other adsorption materials for dehumidification in the cable compartment, but these materials are difficult to replace once saturated, making it difficult to maintain consistent dehumidification.

[0004] Therefore, it is necessary to provide a new ring main unit with anti-condensation function to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a ring main unit with anti-condensation function.

[0006] The ring main unit with anti-condensation function provided by this utility model includes a cabinet body, and the bottom of the cable compartment inside the cabinet body is provided with an inlet for cable to enter, and both sides of the cable compartment are provided with electric heating components for dehumidifying the air inside the cable compartment.

[0007] The cabinet is equipped with a liquid blocking component, which includes an inlet pipe. The inlet pipe is fixedly installed in the inlet port at the bottom of the cabinet by screws and extends into the cable compartment. The inlet pipe is equipped with an annular elastic airbag and an annular air storage chamber for inflating the annular elastic airbag. The annular air storage chamber is equipped with a slidingly connected annular piston, and several central connecting rods are fixedly installed on the annular piston.

[0008] The cable compartment of the cabinet is equipped with multiple sets of dehumidification components, and the dehumidification components include a mounting cylinder. The mounting cylinder is fixedly installed on the inner top wall of the cable compartment, and the lower cylinder surface of the mounting cylinder has several evenly distributed air holes. The mounting cylinder is inserted with a slidingly connected activated carbon column, and the mounting cylinder is provided with an external spring for ejecting the activated carbon column.

[0009] Preferably, the inner wall of the inlet pipe is provided with annularly distributed annular grooves, and the annular grooves are located below the annular gas storage cavity. The outer surface of the annular elastic airbag is fixedly connected to the inner wall of the annular groove, and the annular elastic airbag is interconnected with the annular gas storage cavity through the connecting pipe.

[0010] Preferably, the connecting rod passes through a through hole at the top of the annular gas storage chamber and is slidably connected to the through hole. An L-shaped annular threaded sleeve with an L-shaped cross-section is mounted on the connecting rod. A rotating ring is installed on the inner top wall of the L-shaped annular threaded sleeve and is fixedly connected to the top of the connecting rod.

[0011] Preferably, the inner ring wall of the L-shaped annular threaded sleeve is provided with an internal thread portion, and the inlet of the inlet pipe is provided with an external thread portion that matches the internal thread portion.

[0012] Preferably, the outer spring includes a spring, one end of which is fixedly connected to the inner wall of the mounting cylinder, and the other end of which is fixedly mounted with an abutment plate that is slidably connected to the inner wall of the mounting cylinder. The opening of the mounting cylinder is fitted with a threaded cap that is threadedly connected.

[0013] Preferably, the electric heating assembly includes a mounting bracket, which is fixedly mounted on the inner wall of the cable compartment by screws. A fan is fixedly mounted on the inner side of the mounting bracket, and an electric heating plate is fixedly mounted on the outer side of the mounting bracket. A humidity sensor is also installed inside the cable compartment.

[0014] Preferably, a pressure relief valve is installed on the cable compartment inside the cabinet.

[0015] Compared with related technologies, the ring main unit with anti-condensation function provided by this utility model has the following beneficial effects:

[0016] 1. Compared with traditional fireproof putty and sealant, the annular elastic airbag of this utility model has an elastic structure. The expanded annular elastic airbag can quickly fill the gap between the cable and the inlet pipe, thus sealing the gap between the inlet pipe and the cable and reducing the risk of moisture entering the cabinet from the gap between the inlet pipe and the cable. The elastic structure of the annular elastic airbag not only eliminates the problem of sealing failure of the annular elastic airbag due to cable or cabinet vibration in terms of structure, but also can adapt to cables of different diameters.

[0017] 2. When replacing the activated carbon column, after unscrewing the threaded cap, the activated carbon column is pushed out of the installation cylinder by a portion under the action of the spring force, which makes it convenient for the staff to quickly remove the activated carbon column. The overall operation is simple. Attached Figure Description

[0018] Figure 1 A schematic diagram of a preferred embodiment of the ring main unit with anti-condensation function provided by this utility model;

[0019] Figure 2 for Figure 1 The diagram shows the internal structure of the cabinet.

[0020] Figure 3 for Figure 2 A cross-sectional view of the liquid-blocking component shown.

[0021] Figure 4 for Figure 2 A cross-sectional view of the dehumidification component shown.

[0022] Figure 5 for Figure 2 The diagram shows the structure of the cabinet's electric heating assembly.

[0023] The diagram is labeled as follows: 1. Cabinet; 1a. Cable inlet; 11. Pressure relief valve; 2. Liquid blocking component; 21. Cable inlet pipe; 211. External threaded part; 21a. Annular groove; 21b. Annular air storage chamber; 22. Annular elastic air bladder; 23. Connecting pipe; 24. Annular piston; 25. L-shaped annular threaded sleeve; 251. Internal threaded part; 252. Rotating ring; 26. Central connecting rod; 3. Dehumidification component; 31. Mounting cylinder; 31a. Air hole; 311. Threaded cylinder cover; 32. Activated carbon column; 33. External spring; 331. Spring; 332. Abutment plate; 4. Electric heating component; 41. Mounting bracket; 42. Fan; 43. Electric heating plate; 5. Humidity sensor. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0026] Please see Figures 1 to 5 The present invention provides a ring main unit with anti-condensation function, which includes a cabinet body 1, a liquid blocking component 2, and a dehumidification component 3.

[0027] In the embodiments of this utility model, please refer to Figures 1 to 5 The bottom of the cable compartment inside the cabinet 1 is provided with an inlet 1a for cable entry. A liquid blocking component 2 is installed inside the cabinet 1. The liquid blocking component 2 includes an inlet pipe 21. The inlet pipe 21 is fixedly installed in the inlet 1a by screws and extends into the cable compartment. An annular elastic airbag 22 is installed inside the inlet pipe 21 and an annular air storage cavity 21b is provided for inflating the annular elastic airbag 22. Specifically, the inner wall of the inlet pipe 21 is provided with annularly distributed annular grooves 21a. The annular grooves 21a are located below the annular air storage cavity 21b. The outer surface of the annular elastic airbag 22 is fixedly connected to the inner wall of the annular grooves 21a. The annular elastic airbag 22 is connected to the annular air storage cavity 21b through a connecting pipe 23.

[0028] An annular piston 24 is installed inside the annular gas storage chamber 21b, and several central connecting rods 26 are fixedly installed on the annular piston 24. The central connecting rods 26 pass through a through hole opened at the top of the annular gas storage chamber 21b and are slidably connected to the through hole. An L-shaped annular threaded sleeve 25 with an L-shaped cross section is mounted on the central connecting rod 26. A rotating ring 252 is installed on the inner top wall of the L-shaped annular threaded sleeve 25, and the rotating ring 252 is fixedly connected to the top of the central connecting rod 26. An internal thread 251 is provided on the inner ring wall of the L-shaped annular threaded sleeve 25. An external thread 211 that matches the internal thread 251 is opened at the pipe opening of the inlet pipe 21.

[0029] It should be noted that: the cable is inserted from the bottom of the inlet pipe 21 into the cable compartment inside the cabinet 1, and then the L-shaped annular threaded sleeve 25 is pressed down, thereby the connecting rod 26 pushes down the annular piston 24, causing the gas in the annular air storage chamber 21b to be discharged into the annular elastic air bag 22, causing the annular elastic air bag 22 to expand and extend rapidly. When the L-shaped annular threaded sleeve 25 contacts the external thread 211, the L-shaped annular threaded sleeve 25 is rotated to lock the internal thread 251 and the external thread 211, thus locking the position of the annular piston 24. During maintenance, the L-shaped annular threaded sleeve 25 is reversed to slip off from the external thread 211, and then the L-shaped annular threaded sleeve 25 is pulled up. The sliding annular piston 24 creates a negative pressure in the annular air storage chamber 21b, thereby causing the annular elastic air bag 22 to flow back into the annular air storage chamber 21b, making it easy to remove the cable from the inlet pipe 21.

[0030] Compared with traditional fireproof putty and sealant, the annular elastic airbag 22 has an elastic structure. After expansion, the annular elastic airbag 22 can quickly fill the gap between the cable and the inlet pipe 21, thus sealing the gap between the inlet pipe 21 and the cable and reducing the risk of moisture entering the cabinet 1 from the gap between the inlet pipe 21 and the cable. The elastic structure of the annular elastic airbag 22 not only eliminates the problem of sealing failure caused by the vibration of the cable or the cabinet 1, but also adapts to cables of different diameters.

[0031] Among them, the ring-shaped elastic airbag 22 is made of aging-resistant and highly elastic composite rubber material (such as silicone rubber + fiber reinforcement layer) to improve its fatigue resistance and extend its service life. At the same time, a wear-resistant coating is added to the inside of the airbag to reduce wear during cable plugging and unplugging.

[0032] In the embodiments of this utility model, please refer to Figures 1 to 5 The cable compartment of cabinet 1 is equipped with multiple dehumidification components 3, and the dehumidification components 3 include a mounting cylinder 31. The mounting cylinder 31 is fixedly installed on the inner top wall of the cable compartment, and the lower cylinder surface of the mounting cylinder 31 is provided with several evenly distributed air holes 31a. The mounting cylinder 31 is inserted with a slidingly connected activated carbon column 32, and the mounting cylinder 31 is provided with an external spring 33 for ejecting the activated carbon column 32. The external spring 33 includes a spring 331. One end of the spring 331 is fixedly connected to the inner cylinder wall of the mounting cylinder 31, and the other end of the spring 331 is fixedly installed with an abutment plate 332 that is slidably connected to the inner cylinder wall of the mounting cylinder 31. The cylinder opening of the mounting cylinder 31 is provided with a threaded cylinder cap 311 with a threaded connection.

[0033] It should be noted that when installing the activated carbon column 32, after unscrewing the threaded sleeve cap 311, the activated carbon column 32 is inserted into the installation cylinder 31. Then, the threaded sleeve cap 311 is inserted so that the threaded sleeve cap 311 abuts against the outer end of the activated carbon column 32. As the threaded sleeve cap 311 is screwed inward along the cylinder opening, the activated carbon column 32 is firmly abutted against the abutting plate 332 and the spring 331 is compressed.

[0034] When replacing the activated carbon column 32, after unscrewing the threaded cap 311, the activated carbon column 32 is pushed out of the mounting cylinder 31 by the elastic force of the spring 331, which makes it easy for the staff to quickly remove the activated carbon column 32. The overall operation is simple.

[0035] The activated carbon column 32 can be replaced with a renewable adsorption material (such as a molecular sieve) to reduce costs.

[0036] It should also be noted that the moisture inside the cable compartment can enter the activated carbon column 32 through the pores 31a, thereby allowing the activated carbon column 32 to quickly adsorb the moisture, thus effectively reducing the moisture in the cable compartment.

[0037] In the embodiments of this utility model, please refer to Figures 1 to 5 Both sides of the cable compartment are equipped with electric heating components 4 for dehumidifying the air inside the cable compartment. The electric heating components 4 include mounting brackets 41, which are fixedly installed on the inner wall of the cable compartment by screws. A fan 42 is fixedly installed on the inner side of the mounting bracket 41, and an electric heating plate 43 is fixedly installed on the outer side of the mounting bracket 41. A humidity sensor 5 is also installed inside the cable compartment.

[0038] It should be noted that when the humidity sensor 5 detects that the moisture in the cable compartment exceeds the preset value, the fan 42 and the electric heating plate 43 are turned on. Therefore, the airflow generated by the fan 42 passes through the electric heating plate 43 and forms a hot airflow. This airflow will directly act on the cable compartment to dry the condensation.

[0039] Furthermore, a pressure relief valve 11 is installed on the cable compartment inside the cabinet 1 to prevent excessive air pressure inside the cabinet 1 due to the electric heating component 4.

[0040] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0041] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A ring main unit with anti-condensation function, comprising a cabinet (1), wherein the bottom of the cable compartment inside the cabinet (1) is provided with an inlet (1a) for cable entry, and both sides of the cable compartment are provided with electric heating components (4) for dehumidifying the air inside the cable compartment, characterized in that: The cabinet (1) is equipped with a liquid blocking component (2), and the liquid blocking component (2) includes an inlet pipe (21). The inlet pipe (21) is fixedly installed in the inlet port (1a) at the bottom of the cabinet (1) by screws and extends into the cable compartment. The inlet pipe (21) is equipped with an annular elastic airbag (22) and an annular air storage chamber (21b) for injecting air into the annular elastic airbag (22). The annular air storage chamber (21b) is equipped with a slidingly connected annular piston (24), and several rods of annularly distributed central connecting rods (26) are fixedly installed on the annular piston (24). The cable compartment of the cabinet (1) is equipped with multiple sets of dehumidification components (3), and the dehumidification components (3) include a mounting cylinder (31). The mounting cylinder (31) is fixedly installed on the inner top wall of the cable compartment, and the lower cylinder surface of the mounting cylinder (31) is provided with a number of evenly distributed air holes (31a). The mounting cylinder (31) is inserted with a slidingly connected activated carbon column (32), and the mounting cylinder (31) is provided with an external spring (33) for externally springing the activated carbon column (32).

2. The ring main unit with anti-condensation function according to claim 1, characterized in that, The inner wall of the inlet pipe (21) is provided with annular grooves (21a) distributed in a ring, and the annular grooves (21a) are located below the annular gas storage cavity (21b). The outer surface of the annular elastic airbag (22) is fixedly connected to the inner wall of the annular groove (21a), and the annular elastic airbag (22) is interconnected with the annular gas storage cavity (21b) through the connecting pipe (23).

3. The ring main unit with anti-condensation function according to claim 2, characterized in that, The central connecting rod (26) passes through the through hole at the top of the annular gas storage cavity (21b) and is slidably connected to the through hole. An L-shaped annular threaded sleeve (25) with an L-shaped cross section is mounted on the central connecting rod (26). A rotating ring (252) is installed on the inner top wall of the L-shaped annular threaded sleeve (25), and the rotating ring (252) is fixedly connected to the top of the central connecting rod (26).

4. The ring main unit with anti-condensation function according to claim 3, characterized in that, The inner ring wall of the L-shaped annular threaded sleeve (25) is provided with an internal thread (251), and the inlet of the inlet pipe (21) is provided with an external thread (211) that matches the internal thread (251).

5. The ring main unit with anti-condensation function according to claim 1, characterized in that, The outer spring (33) includes a spring (331), one end of which is fixedly connected to the inner wall of the mounting cylinder (31), and the other end of which is fixedly installed with an abutment plate (332) that is slidably connected to the inner wall of the mounting cylinder (31). The cylinder opening of the mounting cylinder (31) is fitted with a threaded cap (311) that is threadedly connected.

6. The ring main unit with anti-condensation function according to claim 1, characterized in that, The electric heating assembly (4) includes a mounting bracket (41), which is fixedly mounted on the inner wall of the cable compartment by screws. A fan (42) is fixedly mounted on the inner side of the mounting bracket (41), and an electric heating plate (43) is fixedly mounted on the outer side of the mounting bracket (41). A humidity sensor (5) is also installed inside the cable compartment.

7. The ring main unit with anti-condensation function according to claim 1, characterized in that, The cable compartment inside the cabinet (1) is equipped with a pressure relief valve (11).

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