Water vapor permeation prevention structure of primary and secondary fused ring network cabinet

Abstract

This application relates to the field of integrated ring main unit technology, specifically a waterproof vapor-permeable structure for primary and secondary integrated ring main units. The structure includes an integrated ring main unit body with wire holes on its outer wall. A detachable protective structure is installed inside the integrated ring main unit, located at one end of the wire holes. The protective structure includes a hollow sheath, connectors, a first seal, and a second seal. The first seal consists of an annular seat and a sealing airbag. This waterproof vapor-permeable structure for primary and secondary integrated ring main units offers the advantages of double-sealing protection and excellent waterproof vapor-permeable performance. The first radial seal between the wire harness and the sheath is achieved through the radial expansion of the sealing airbag, while the second axial seal at the end of the wire harness is achieved through the deformation and contraction of the sealing tube. These two sealing barriers work together to effectively block moisture from permeating along the outer wall of the wire harness into the interior of the unit, significantly improving the ring main unit's moisture-proof and condensation-proof capabilities.

Description

Technical Field

[0001] This application relates to the field of integrated ring main unit technology, and in particular to a waterproof vapor permeation structure for a primary and secondary integrated ring main unit. Background Technology

[0002] Integrated primary and secondary ring main units (RMUs) are widely used in outdoor power distribution networks. The cable holes on the side walls of the unit are the main channels for moisture, condensation, and dust intrusion, and their sealing performance directly determines the insulation performance and operational stability of the RMU. Currently, most existing RMU cable hole sealing structures use a single rubber plug or locking seal structure, which is simple in overall structure and has a single form of protection. However, due to long-term exposure to power frequency vibration and alternating high and low temperature differences, problems such as aging and loosening of seals and failure of the seals may occur. The risk of moisture infiltration is prominent, which can easily lead to corrosion of internal components, insulation degradation, short circuit tripping, and other faults.

[0003] Meanwhile, existing sealing structures have two major drawbacks: First, poor sealing stability; long-term slight movement of the wiring harness will continuously wear down the seals, and the lack of an anti-movement centering structure makes it impossible to maintain a stable sealing state for a long time. Second, extremely poor maintenance adaptability; existing integrated sealing structures require complete removal of the wire hole seal and dismantling of the wiring harness positioning structure when repairing or replacing sealing components. During the entire maintenance process, the wire hole remains completely open, making continuous sealing protection impossible. In outdoor humid, rainy, or snowy conditions, a large amount of water vapor and moisture directly enters the cabinet during maintenance, easily causing moisture damage to the equipment. This makes it impossible to perform maintenance without shutting off the seal, severely impacting equipment maintenance efficiency and operational safety, and failing to meet the protection requirements for the long-term stable operation of distribution network equipment. Therefore, this application proposes a waterproof vapor-permeable structure for a primary and secondary integrated ring main unit to address the aforementioned deficiencies of the existing technology. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this application provides a waterproof and vapor-permeable structure for a primary and secondary integrated ring main unit. This structure offers advantages such as reliable sealing performance, ease of maintenance and repair without power interruption, and continuous sealing and protection of the wiring holes during maintenance, thus solving the aforementioned problems.

[0005] This application provides a waterproof vapor-permeable structure for a primary and secondary integrated ring main unit, employing the following technical solution:

[0006] A waterproof vapor-permeable structure for a primary and secondary integrated ring main unit includes an integrated ring main unit body, on the outer wall of which a wire hole is provided, and a protective structure is detachably installed inside the integrated ring main unit body, wherein the protective structure is located at one end of the wire hole;

[0007] The protective structure includes a hollow sheath tube, a connector, a first seal and a second seal. The first seal consists of an annular seat and a sealing airbag. The outer surface of the sheath tube is fitted with a first guide sleeve and a second guide sleeve. The inside of the sheath tube is provided with a detection component for detecting the sealing airbag, and the detection component works in conjunction with the first guide sleeve.

[0008] The detection assembly includes a lifting rod, a return spring, and a detection element. The detection element is located above the sealing airbag and includes a telescopically connected rod and a sleeve. A pressure block that abuts against the sealing airbag is fixed to the bottom side of the sleeve. An air chamber is formed inside the rod. An air tube extending into the air chamber is installed on the outer wall of the sealing airbag. A piston is slidably sealed inside the air chamber. A connecting rod is hinged between the rod and the lifting rod, and a support rod is hinged to the outer wall of the connecting rod.

[0009] Optionally: The connector consists of a fixedly connected joint and a positioning ring, wherein the joint is connected to a locking ring outside the wire harness, and the positioning ring extends into the inside of the sheath tube and abuts against the sealing airbag, causing the sealing airbag to expand, thereby making the inner side of the sealing airbag fit against the outer surface of the wire harness to achieve a seal.

[0010] Optionally: The positioning ring has an extension groove inside, and a positioning block is slidably installed inside the extension groove. The positioning block extends into the sheath tube to fix the positioning ring. A first return spring is fixed between the positioning ring and the extension groove.

[0011] Optionally: The end of the sheath tube is provided with a plurality of elastic seats distributed in a ring, and a ball bearing is rotatably installed on the inner side of each elastic seat. The inner side of the first guide sleeve and the outer side of the plurality of elastic seats are provided with an interference fit guide slope second. The inner side of the second guide sleeve is provided with guide slope first and an annular abutment groove.

[0012] Optionally, the second sealing element includes a hollow guide tube, a compression ring, and a sealing tube. The sealing tube is embedded inside the guide tube, the compression ring is sleeved on the outer surface of the guide tube, a return spring is fixed between the compression ring and the guide tube, and a lever is installed on the outer wall of the compression ring to abut against the inner side of the annular abutment groove.

[0013] Optional: The sheath tube has a lifting groove and an installation groove inside. The lifting rod is slidably installed in the lifting groove. The lifting rod extends into the inside of the sheath tube, and its top end is provided with an arc-shaped surface that abuts against the guide inclined surface. When the displacement guide sleeve is moved, the guide inclined surface pushes the lifting rod down, which not only releases the fixing of the positioning ring, but also lifts the detection piece through the connecting rod. At the same time, the lever is used to squeeze the sealing tube, thereby sealing the wire harness through the sealing tube.

[0014] Optionally: the rod is slidably installed in the mounting groove, with its bottom end extending to the inside of the sheath tube, and a piston is slidably sealed inside the air chamber, wherein the end of the piston extends to the outside of the rod.

[0015] Optional: A return spring is wound around the outer surface of the piston, the air pipe passes through the inside of the sleeve, and the connecting rod is arranged in an inclined position.

[0016] Optionally: the sleeve is hollow inside and is fitted onto the outside of the rod, and a return spring is installed between its opposite sides, and the support rod is fixed to the bottom wall of the mounting groove.

[0017] Optionally: A return spring three is provided on the top outer surface of the lifting rod. By reciprocating the guide sleeve two, the lifting rod is raised and lowered repeatedly, which in turn drives the detection piece to be raised and lowered repeatedly through the connecting rod. During the reciprocating raising and lowering process, the lifting rod drives the rod body to be raised and lowered repeatedly through the connecting rod, which in turn drives the piston to deliver air into the sealing airbag. Finally, the pressure block is attached to the outside of the sealing airbag to detect the sealing airbag.

[0018] In summary, this application includes at least one of the following beneficial technical effects:

[0019] 1. This invention has the advantages of double sealing protection and good water vapor penetration effect. The first radial seal between the wire harness and the sheath tube is achieved by the radial expansion of the sealing airbag, and the second axial seal at the end of the wire harness is achieved by the deformation and contraction of the sealing tube. The two sealing barriers work together to effectively block the channel for water vapor to penetrate into the cabinet body along the outer wall of the wire harness, significantly improving the moisture-proof and condensation-proof ability of the ring main unit.

[0020] 2. This invention, by having the pressure block always in contact with the outer wall of the sealing airbag, can sense the expansion pressure and deformation state of the airbag in real time. Once the sealing airbag leaks or depressurizes, the pressure change can be detected in time, making it easy for maintenance personnel to discover sealing failure problems in a timely manner. It achieves the advantages of real-time detection of sealing status and high reliability.

[0021] 3. In this invention, when depressurization of the sealing airbag is detected, the piston can be driven to pump gas into the sealing airbag by reciprocating push and pull of the guide sleeve two, achieving temporary gas replenishment and pressurization, thus delaying seal failure. If the pressure still does not recover after gas replenishment, the second sealing element can be further triggered to activate the second sealing barrier, ensuring effective sealing protection before maintenance, thus possessing the advantages of emergency gas replenishment and secondary sealing functions.

[0022] 4. In this invention, when the lifting rod moves down, the positioning block can be automatically pushed out of the lifting groove, releasing the locking and fixing of the positioning ring. The connecting parts can be quickly disassembled without special tools, which facilitates the inspection or replacement of the sealing airbag and reduces the difficulty and cost of operation and maintenance.

[0023] 5. The detection component works in conjunction with the second guide sleeve, and multiple functions such as seal detection, air replenishment and pressurization, second seal triggering, and positioning and unlocking can be achieved simultaneously through a single displacement operation of the second guide sleeve. The structure is ingeniously designed and easy to operate. Attached Figure Description

[0024] Figure 1 This is a structural schematic diagram of the integrated ring network cabinet in this application;

[0025] Figure 2 This is a schematic diagram of the structure of this application;

[0026] Figure 3 This is a cross-sectional view of the protective structure of this application;

[0027] Figure 4 This is a cross-sectional view of the structure of seal element 2 in this application;

[0028] Figure 5 This is a schematic diagram of the positioning ring structure of this application;

[0029] Figure 6 This application Figure 4 A magnified structural diagram of structure A is shown below;

[0030] Figure 7 This application Figure 5 A magnified schematic diagram of structure B is shown.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Integrated ring main unit; 11. Cable hole; 2. Protective structure; 21. Sheath tube; 22. Connector; 23. Positioning ring; 231. Extension groove; 232. Positioning block; 233. First return spring; 24. Seal I; 241. Annular seat; 242. Sealing airbag; 243. Air pipe; 25. Elastic seat; 26. Guide sleeve I; 27. Ball bearing; 28. Guide sleeve II; 281. Annular abutment groove; 282. Guide slope I; 29. ​​Seal II; 291 1. Guide tube; 292. Extrusion ring; 293. Sealing tube; 294. Return spring II; 295. Toggle lever; 210. Guide slope II; 3. Detection assembly; 31. Lifting rod; 32. Return spring III; 33. Detection piece; 331. Rod body; 332. Sleeve; 333. Pressure block; 334. Return spring IV; 335. Air chamber; 336. Connecting rod; 337. Support rod; 338. Piston; 339. Return spring V; 34. Lifting groove; 35. Mounting groove. Detailed Implementation

[0033] The following is in conjunction with the appendix Figures 1-7 This application will be described in further detail.

[0034] This application discloses a waterproof vapor-permeable structure for a primary and secondary fusion ring main unit, including a fusion ring main unit body 1. A wire hole 11 is provided on the outer wall of the fusion ring main unit body 1 for wire harnesses to pass through. A protective structure 2 is detachably installed inside the fusion ring main unit body 1. The protective structure 2 is located at one end of the wire hole 11 and is used to seal and protect the wire harnesses entering the cabinet body.

[0035] Specifically, the protective structure 2 includes a hollow sheath 21, a connector, a first seal 24, and a second seal 29. One end of the sheath 21 is fixedly connected to or abuts against the inner wall of the fusion ring network cabinet 1, and its internal channel is connected to the wire hole 11. The first seal 24 consists of an annular seat 241 and a sealing airbag 242. The annular seat 241 is fixedly installed on the inner wall of the sheath 21, and the sealing airbag 242 is disposed inside the annular seat 241. The outer surface of the sheath 21 is fitted with a first guide sleeve 26 and a second guide sleeve 28, both of which can slide axially along the outer wall of the sheath 21. A detection component 3 is disposed inside the sheath 21, and the detection component 3 is linked with the second guide sleeve 28. The first guide sleeve 26 and the second guide sleeve 28 are threadedly engaged, and one of the first guide sleeve 26 and the second guide sleeve 28 is threadedly engaged with the sheath 21.

[0036] The connector consists of a fixedly connected joint 22 and a positioning ring 23. The joint 22 connects to a locking ring on the outside of the wire harness, securing the wire harness end to the connector. It should be noted that the fixed connection between the joint 22 and the locking ring on the outside of the wire harness acts as a stop on the wire harness. When the positioning ring 23 is engaged with the inner wall of the sheath tube 21 via the positioning block 232, the entire connector is locked. When the wire harness is subjected to an outward pulling force, the force is directly transmitted to the sheath tube 21 and the cabinet through the locking ring, joint 22, positioning ring 23, and positioning block 232, thereby axially tightening and fixing the wire harness, restricting its forward and backward movement. Specifically, the positioning ring 23 has a tubular structure, with one end fixedly connected to the joint 22 and the other end extending into the sheath tube 21 and abutting against the outer wall of the sealing airbag 242. When the positioning ring 23 is inserted into the sheath tube 21, it compresses the sealing airbag 242, causing the sealing airbag 242 to expand radially. The inner side of the sealing airbag 242 fits tightly against the outer surface of the wire harness, achieving a radial seal between the wire harness and the sheath tube 21.

[0037] The positioning ring 23 has an extension groove 231 inside, and a positioning block 232 is slidably installed inside the extension groove 231. It should be noted that the top side of the positioning block 232 has a spherical surface to facilitate better sliding into the sheath tube 21. A groove adapted to the positioning block 232 is formed on the inner wall of the sheath tube 21. A first return spring 233 is fixed between the positioning block 232 and the bottom wall of the extension groove 231. Under normal conditions, the elastic force of the first return spring 233 pushes the positioning block 232 outward from the extension groove 231 and into the sheath tube 21, thus locking and fixing the positioning ring 23 to the sheath tube 21.

[0038] Multiple elastic seats 25 are arranged in a ring at the end of the sheath tube 21 away from the fusion ring network cabinet 1. The multiple elastic seats 25 are evenly distributed along the circumference of the sheath tube 21. Each elastic seat 25 has a ball bearing 27 rotatably mounted on its inner side. The ball bearing 27 is used to reduce the friction when the guide sleeve 1 26 and the guide sleeve 28 slide. It should be noted that when the guide sleeve 1 26 slides, it squeezes the multiple elastic seats 25 through the guide inclined surface 210, causing it to contract radially. The ball bearing 27 tightly presses against the outer wall of the wire harness, generating a huge static friction force, which is equivalent to adding a radial clamping anchor point in the middle and rear section of the wire harness, further preventing the wire harness from sliding. Specifically, the inner side of the guide sleeve 1 26 and the outer side of the multiple elastic seats 25 are provided with an interference fit guide inclined surface 210. When the guide sleeve 1 26 slides along the axial direction of the sheath tube 21, the elastic seats 25 can be driven to contract or expand radially through the cooperation of the guide inclined surface 210. The inner side of the guide sleeve 28 is provided with a guide slope 282 and an annular abutment groove 281. Further explanation is that the ring main unit experiences power frequency vibration during operation, and a single locking ring is prone to loosening under long-term vibration. In this solution, the "locking ring and positioning block 232" bear the axial tensile force, while the "elastic seat 25 and ball bearing 27" provide radial clamping force. This dual constraint forms redundant fixation, effectively resisting long-term mechanical vibration and eliminating the risk of the wire harness gradually coming off the terminal due to vibration. Additionally, since the sealing airbag 242 is an elastic rubber component, if the wire harness is not fixed, any slight axial movement will cause the outer wall of the wire harness to repeatedly rub against the inner wall of the airbag like "sandpaper." Tightening and fixing eliminates relative movement, preventing shearing and wear of the inner wall of the airbag by the wire harness, ensuring the long-term effectiveness of the first radial seal, and greatly delaying the aging and failure of the sealing airbag 242.

[0039] Furthermore, the multiple elastic seats 25 are evenly distributed in a ring. The radial contraction and tightening process essentially pushes the wire harness to the axial position of the sheath tube 21 automatically. Through the centering and guiding effect, the wire harness is always centered. This not only ensures that the sealing airbag 242 is evenly stressed and fits better when it expands, but also ensures that the sealing tube 293 in the second seal 29 can evenly wrap the wire harness around the circumference when it contracts. This avoids the risk of sealing failure caused by excessive compression on one side and gaps on the other side due to wire harness eccentricity.

[0040] In this embodiment, the second seal 29 includes a hollow guide tube 291, a compression ring 292, and a sealing tube 293. The guide tube 291 is fixedly installed inside the sheath tube 21 near the end where the wire harness passes through. The sealing tube 293 is embedded inside the guide tube 291 and is made of elastic sealing material, with an inner diameter larger than the outer diameter of the wire harness. The compression ring 292 is sleeved on the outer surface of the guide tube 291, and a return spring 294 is fixed between the compression ring 292 and the guide tube 291. A lever 295 is installed on the outer wall of the compression ring 292, and the lever 295 extends radially outward and abuts against the annular abutment groove 281 on the inner side of the second guide sleeve 28. When the guide sleeve 28 moves axially, it drives the lever 295 and the compression ring 292 to move synchronously through the annular abutment groove 281. The compression ring 292 axially compresses the sealing tube 293 embedded inside the guide tube 291, causing the sealing tube 293 to undergo radial deformation and contraction, tightly wrapping the outer wall of the wire harness, thus achieving axial sealing.

[0041] The detection component 3 includes a lifting rod 31, a return spring 32, and a detection element 33. The detection element 33 is located above the sealing airbag 242. The detection element 33 includes a telescopically connected rod 331 and a sleeve 332. The sleeve 332 is fitted outside the rod 331 and can slide axially relative to the rod 331. A return spring 334 is installed between the sleeve 332 and the rod 331. A pressure block 333 is fixed to the bottom side of the sleeve 332 and abuts against the outer wall of the sealing airbag 242. An air chamber 335 is opened inside the rod 331. An air tube 243 is installed on the outer wall of the sealing airbag 242. One end of the air tube 243 communicates with the inside of the sealing airbag 242, and the other end extends into the air chamber 335. A piston 338 is slidably sealed inside the air chamber 335. One end of the piston 338 extends to the outside of the rod 331. A return spring 339 is wound around the outer surface of the piston 338. A connecting rod 336 is hinged between the rod body 331 and the lifting rod 31. The connecting rod 336 is set at an inclination. A support rod 337 is hinged to the outer wall of the connecting rod 336 and is fixed inside the protective sleeve 21.

[0042] The sheath tube 21 has a lifting groove 34 and a mounting groove 35 inside. Specifically, the positioning block 232 extends into the lifting groove 34. When the lifting rod 31 moves down, it contacts the positioning block 232, thus releasing the positioning ring 23. The lifting rod 31 is slidably installed in the lifting groove 34. The top end of the lifting rod 31 extends to the outside of the sheath tube 21 and has an arc-shaped surface. This arc-shaped surface abuts against the guide slope 282 on the inner side of the guide sleeve 28. A return spring 32 is provided on the top outer surface of the lifting rod 31, which provides an upward return force for the lifting rod 31. The rod body 331 is slidably installed in the mounting groove 35, and the bottom end of the rod body 331 extends to the inside of the sheath tube 21.

[0043] Example 2

[0044] The difference between this embodiment and Embodiment 1 is that the linkage method of the detection component 3 is different.

[0045] In this embodiment, the bottom end of the lifting rod 31 extends into the interior of the sheath tube 21 and can abut against the positioning block 232. When the guide sleeve 28 slides axially along the sheath tube 21, the guide inclined surface 282 pushes the lifting rod 31 downward against the elastic force of the return spring 32. During the downward movement of the lifting rod 31, its bottom end pushes the positioning block 232 out of the groove on the inner wall of the sheath tube 21, releasing the locking and fixing of the positioning ring 23. At the same time, the lifting rod 31 drives the rod body 331 and the sleeve 332 to move upward through the connecting rod 336, lifting the detection piece 33.

[0046] As the guide sleeve 28 continues to move, its inner annular abutment groove 281 abuts against the lever 295, causing the compression ring 292 to slide axially along the guide tube 291, compressing the reset spring 294. The compression ring 292 axially compresses the sealing tube 293, causing the sealing tube 293 to deform and shrink, thus axially sealing the wire harness.

[0047] When the guide sleeve 28 moves in the reverse direction, the lifting rod 31 returns to its original position upward under the action of the return spring 32, and the connecting rod 336 drives the rod body 331 and the sleeve 332 to return to their original position downward, and the pressure block 333 re-adheres to the outer wall of the sealing airbag 242. At the same time, the positioning block 232 re-engages into the groove on the inner wall of the sheath tube 21 under the action of the first return spring 233, restoring the locking and fixing of the positioning ring 23.

[0048] Example 3

[0049] The difference between this embodiment and Embodiment 1 is that the detection component 3 uses a different method to detect and replenish the airbag 242.

[0050] In this embodiment, when it is necessary to detect the sealing status of the sealing airbag 242, the lifting rod 31 is reciprocated up and down along the lifting groove 34 by reciprocating push and pull of the guide sleeve 28. During the lifting process, the lifting rod 31 is driven by the connecting rod 336 to slide back and forth in the mounting groove 35. When the rod 331 slides back and forth, it drives the piston 338 to reciprocate within the air chamber 335. When the piston 338 slides into the air chamber 335, it forces the gas in the air chamber 335 into the sealing airbag 242 through the air pipe 243, increasing the internal air pressure of the sealing airbag 242. When the piston 338 slides out of the air chamber 335, it is reset by the action of the return spring 339, and at the same time, gas is drawn from the inside of the sealing airbag 242 through the air pipe 243.

[0051] During the reciprocating gas pumping process, the pressure block 333 remains in contact with the outer wall of the sealing bladder 242. If the sealing bladder 242 is properly sealed, its internal air pressure will change accordingly with the pumping action of the piston 338, and the contact pressure felt by the pressure block 333 will also change accordingly. If the sealing bladder 242 is damaged or leaking, even if the piston 338 continues to pump gas, the internal air pressure of the sealing bladder 242 cannot be effectively established, and the contact pressure of the pressure block 333 will not change significantly, indicating that the sealing bladder 242 has failed. It should be noted that both the piston 338 and the gas pipe 243 are equipped with check valves.

[0052] Example 4

[0053] The difference between this embodiment and Embodiment 1 is that the way the guide sleeve 26 and the elastic seat 25 are matched is different.

[0054] In this embodiment, a guide slope 210 is provided on the inner side of the guide sleeve 26, and a mating slope adapted to the guide slope 210 is provided on the outer side of the plurality of elastic seats 25. When the guide sleeve 26 slides along the axial direction of the sheath tube 21 towards the elastic seat 25, the guide slope 210 abuts against the mating slope on the outer side of the elastic seat 25, pushing the plurality of elastic seats 25 to synchronously retract radially inward, so that the ball bearings 27 on the inner side of the elastic seat 25 clamp the outer surface of the wire harness, thereby achieving auxiliary positioning of the wire harness.

[0055] When the guide sleeve 26 slides in the reverse direction, the elastic seat 25 expands radially outward under its own elastic restoring force, releasing the clamping of the wire harness. By sliding the guide sleeve 26, the clamping and releasing states of the wire harness can be flexibly switched as needed, facilitating the insertion, adjustment, or extraction of the wire harness.

[0056] Example 5

[0057] The difference between this embodiment and Embodiment 1 is that the structure of the sealing tube 293 is different.

[0058] In this embodiment, the inner wall of the sealing tube 293 is provided with multiple annular sealing protrusions, which are spaced apart along the axial direction of the sealing tube 293. When the compression ring 292 axially compresses the sealing tube 293, the sealing tube 293 undergoes radial deformation and contraction, and the multiple annular sealing protrusions on its inner wall contract inward simultaneously, forming multiple annular sealing contact surfaces with the outer surface of the wire harness, further enhancing the axial sealing effect.

[0059] The sealing tube 293 is made of silicone rubber or fluororubber, which has good elastic deformation ability and aging resistance, and can maintain stable sealing performance during long-term use.

[0060] Example 6

[0061] The difference between this embodiment and Embodiment 1 is that the detection component 3 is also provided with a signal output unit.

[0062] In this embodiment, a pressure sensor is provided on the contact surface between the pressure block 333 and the sealing airbag 242. The pressure sensor is used to detect the contact pressure of the sealing airbag 242 on the pressure block 333. The pressure sensor is electrically connected to a signal output unit disposed outside the sheath tube 21 via a signal line. The signal output unit can convert the pressure signal detected by the pressure sensor into an electrical signal and transmit it to a remote monitoring terminal via wired or wireless means.

[0063] Maintenance personnel can view the pressure data of the sealing airbag 242 in real time through a remote monitoring terminal to keep track of changes in the sealing status. When the pressure data falls below a preset threshold, the remote monitoring terminal can issue an alarm signal to remind maintenance personnel to go to the site for timely handling.

[0064] It should be noted that this application can be widely used for sealing and protecting the cable entry and exit holes of various outdoor ring main units, switch cabinets, and other power equipment. Its dual-seal structure design is reasonable, ensuring high sealing reliability. It also features sealing status detection and emergency air replenishment functions, effectively solving the technical problems of poor sealing effect, inability to monitor in real time, and difficult maintenance associated with traditional sealing structures.

[0065] Combined with appendix Figures 1-7 The working principle of the above embodiments is as follows:

[0066] During equipment assembly, the wire harness is passed through the wire hole 11 of the fusion ring cabinet 1 and the inside of the sheath tube 21. Multiple elastic seats 25 are distributed in a ring array at the end of the sheath tube 21. Roller balls 27 are rotatably installed on the inner side of the elastic seats 25 to reduce the sliding friction of the guide sleeve. Then, the wire harness and the sheath tube 21 are positioned and fixed by a connector. The connector consists of a fixedly connected joint 22 and a positioning ring 23. The joint 22 is fixedly connected to the external locking ring of the wire harness to limit the end of the wire harness. The positioning ring 23 extends into the inside of the sheath tube 21 and abuts against and squeezes against the outer wall of the sealing airbag 242. At the same time, an extension groove 231 is opened inside the positioning ring 23. A positioning block 232 is slidably assembled in the extension groove 231. A first return spring 233 is fixed between the positioning block 232 and the extension groove 231. Under normal conditions, the first return spring 233 pushes the positioning block 232 to extend into the groove on the inner wall of the sheath tube 21 to lock and fix the positioning ring 23, ensuring the stability of the connection structure.

[0067] When the sealing airbag 242 expands under pressure, its inner side tightly adheres to the outer surface of the wire harness, and its outer side adheres to the inner wall of the sheath tube 21, achieving a radial full seal between the wire harness and the sheath tube 21, forming a barrier against water vapor penetration. During use, the pressure block 333 is always in contact with the outer wall of the sealing airbag 242, and the expansion pressure and deformation state of the airbag are monitored in real time. If the sealing airbag 242 fails to seal, leaks air and depressurizes, the airbag deforms and contracts, and the contact pressure of the pressure block 333 will change significantly. At this time, by reciprocatingly pushing and pulling the guide sleeve 28, the lifting rod 31 can be driven to reciprocate up and down along the lifting groove 34. The return spring 32 provides a return force for the lifting rod 31, ensuring the stability of the reciprocating motion. During the lifting process, the lifting rod 31 drives the rod body 331, the sleeve 332 and the pressure block 333 to reciprocate up and down as a whole through the connecting rod 336, while simultaneously driving the piston 338 in the air... The piston 338 slides back and forth in cavity 335. When the piston 338 moves upward, it pumps gas into the sealing airbag 242 through air pipe 243 to increase the air pressure inside the sealing airbag 242 and strengthen the sealing fit. If the pressure of the sealing airbag 242 has not changed, it can be judged that the sealing airbag 242 has failed. At this time, the guide sleeve 28 is moved. During the displacement of the guide sleeve 28, its internal annular abutment groove 281 abuts and cooperates with the lever 295, driving the lever 295 and the connected compression ring 292 to slide along the axial direction of the guide tube 291, compressing the reset spring 294. The compression ring 292 axially compresses the sealing tube 293 embedded in the inner side of the guide tube 291, causing the sealing tube 293 to deform and shrink, tightly wrapping the outer wall of the wire harness, realizing the axial seal of the wire harness end, forming a second water vapor infiltration barrier, and completely blocking the water vapor infiltration channel through the double sealing structure.

[0068] In addition, when the lifting rod 31 moves down, it will push the positioning block 232 out of the lifting groove 34. At this time, the positioning ring 23 is released from fixation, and the staff can remove the positioning ring 23 and the connector 22 to carry out the maintenance of the sealing airbag 242.

[0069] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A waterproof and vapor permeable structure of a secondary fused ring network cabinet, comprising a fused ring network cabinet body (1), characterized in that: The outer wall of the fusion ring network cabinet (1) is provided with a wire hole (11), and a protective structure (2) is detachably installed inside the fusion ring network cabinet (1), wherein the protective structure (2) is located at one end of the wire hole (11); The protective structure (2) includes a hollow sheath tube (21), a connector, a first seal (24) and a second seal (29). The first seal (24) consists of an annular seat (241) and a sealing airbag (242). The outer surface of the sheath tube (21) is fitted with a first guide sleeve (26) and a second guide sleeve (28). The inside of the sheath tube (21) is provided with a detection component (3) for detecting the sealing airbag (242), and the detection component (3) is used in conjunction with the first guide sleeve (26). The detection component (3) includes a lifting rod (31), a return spring (32), and a detection element (33). The detection element (33) is located above the sealing airbag (242). The detection element (33) includes a telescopically connected rod (331) and a sleeve (332). A pressure block (333) that abuts against the sealing airbag (242) is fixed on the bottom side of the sleeve (332). An air chamber (335) is opened inside the rod (331). An air tube (243) extending into the air chamber (335) is installed on the outer wall of the sealing airbag (242). A piston (338) is slidably sealed inside the air chamber (335). A connecting rod (336) is hinged between the rod (331) and the lifting rod (31), and a support rod (337) is hinged on the outer wall of the connecting rod (336).

2. The waterproof and moisture permeable structure of the primary and secondary fusion ring network cabinet according to claim 1, characterized in that: The connector consists of a fixedly connected joint (22) and a positioning ring (23). The joint (22) is connected to a locking ring outside the wire harness. The positioning ring (23) extends into the sheath tube (21) and abuts against the sealing airbag (242), causing the sealing airbag (242) to expand. Thus, the inner side of the sealing airbag (242) fits against the outer surface of the wire harness, achieving a seal.

3. The waterproof vapor-permeable structure of the primary and secondary integrated ring main unit according to claim 2, characterized in that: The positioning ring (23) has an extension groove (231) inside. A positioning block (232) is slidably installed inside the extension groove (231). The positioning block (232) extends into the sheath tube (21) to fix the positioning ring (23). A first return spring (233) is fixed between the positioning ring (23) and the extension groove (231).

4. The waterproof vapor-permeable structure of the primary and secondary integrated ring main unit according to claim 1, characterized in that: The end of the sheath tube (21) is provided with a plurality of elastic seats (25) arranged in a ring. The inner side of each elastic seat (25) is rotatably mounted with a ball (27). The inner side of the first guide sleeve (26) and the outer side of the plurality of elastic seats (25) are provided with an interference fit guide slope two (210). The inner side of the second guide sleeve (28) is provided with a guide slope one (282) and an annular abutment groove (281).

5. The waterproof vapor-permeable structure of the primary and secondary integrated ring main unit according to claim 4, characterized in that: The second sealing element (29) includes a hollow guide tube (291), a compression ring (292) and a sealing tube (293). The sealing tube (293) is embedded inside the guide tube (291). The compression ring (292) is sleeved on the outer surface of the guide tube (291). A return spring (294) is fixed between the compression ring (292) and the guide tube (291). A lever (295) is installed on the outer wall of the compression ring (292) to abut against the inner side of the annular abutment groove (281).

6. The waterproof vapor-permeable structure of the primary and secondary integrated ring main unit according to claim 1, characterized in that: The sheath tube (21) is provided with a lifting groove (34) and an installation groove (35) respectively. The lifting rod (31) is slidably installed in the lifting groove (34). The lifting rod (31) extends into the sheath tube (21) and its top end is provided with an arc surface that abuts against the guide slope (282). When the displacement guide sleeve (28) is used, the guide slope (282) pushes the lifting rod (31) down, which not only releases the fixing of the positioning ring (23), but also lifts the detection piece (33) through the connecting rod (336). At the same time, the lever (295) is used to squeeze the sealing tube (293), thereby sealing the wire harness through the sealing tube (293).

7. The waterproof vapor-permeable structure of the primary and secondary integrated ring main unit according to claim 6, characterized in that: The rod (331) is slidably installed in the mounting groove (35), and its bottom end extends to the inside of the sheath tube (21). The piston (338) is slidably sealed inside the air chamber (335), wherein the end of the piston (338) extends to the outside of the rod (331).

8. The waterproof vapor-permeable structure of the primary and secondary integrated ring main unit according to claim 7, characterized in that: A return spring (339) is wound around the outer surface of the piston (338), the air pipe (243) passes through the inside of the sleeve (332), and the connecting rod (336) is set in an inclined position.

9. The waterproof vapor-permeable structure of the primary and secondary integrated ring main unit according to claim 7, characterized in that: The sleeve (332) is hollow inside and is sleeved on the outside of the rod (331), and a return spring (334) is installed between its opposite sides. The support rod (337) is fixed on the bottom wall of the mounting groove (35).

10. The waterproof vapor-permeable structure of the primary and secondary integrated ring main unit according to claim 7, characterized in that: The top outer surface of the lifting rod (31) is provided with a return spring three (32). By reciprocating the guide sleeve two (28), the lifting rod (31) is raised and lowered repeatedly, and then the detection piece (33) is driven to be raised and lowered repeatedly through the connecting rod (336). During the reciprocating raising and lowering process, the lifting rod (31) drives the rod body (331) to be raised and lowered repeatedly through the connecting rod (336), and then drives the piston (338) to deliver air into the sealed airbag (242). Finally, the pressure block (333) is attached to the outside of the sealed airbag (242) to detect the sealed airbag (242).

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