Cable incoming and outgoing line sealing interface of distribution box

Abstract

The invention discloses a power distribution box cable incoming and outgoing line sealing interface, which relates to the field of power distribution cabinet equipment, and comprises a power distribution cabinet body, a sealing opening, an outer ring sleeve arranged at the sealing opening, a taper sleeve body arranged in the outer ring sleeve, a sealing connection between the outer ring sleeve and the taper sleeve body through an elastic section, a filling body arranged between the outer ring sleeve and the taper sleeve body, and an adjusting piece arranged between the taper sleeve body and the outer ring sleeve. An inserting body is arranged in the taper sleeve body; the outer ring is sleeved with a sealing cover, the sealing cover is provided with a conical sleeve, the conical sleeve is provided with a plugging bag body, the conical sleeve is provided with a contraction ring, the contraction ring slides along the conical sleeve to extrude the plugging bag body, the conical sleeve is externally provided with a fixing piece, and the outlet sealing interface is of a multi-layer sealing structure under the synergistic effect of an internal adjustable conical sleeve body and an external compressible plugging bag body. The mechanical adjustment can actively change the hooping force on the cable bundle, and can fill irregular gaps between the cables in real time, thereby significantly improving the adaptability to different cable numbers, sizes and environmental changes.

Description

Technical Field

[0001] This invention relates to the field of power distribution rail equipment technology, specifically to a sealed interface for cable inlet and outlet of a power distribution box. Background Technology

[0002] The distribution cabinet contains various electrical components that transmit power and signals via cables. After the cables pass through the inlet and outlet of the distribution cabinet, in order to prevent dust, water and other contaminants from accumulating at the exposed electrical connections, which could form conductive paths, lead to decreased insulation, creepage discharge, and ultimately cause phase-to-phase or phase-to-ground short circuits, resulting in tripping, equipment damage or even fire. At the same time, in order to prevent insects or rodents from damaging the cables in the distribution cabinet, the cable inlet and outlet of the distribution cabinet need to be sealed.

[0003] Existing methods for sealing cable inlets and outlets in distribution cabinets include elastomeric compression seals, commonly found in cable glands. These seals primarily utilize rubber deformation to seal and secure the cables at the inlet and outlet. Another method involves casting or filling seals, typically using fireproof putty or foam sealant to fill the cable inlet and outlet. However, with elastomeric compression seals, the sealing pressure comes entirely from rubber deformation. Over time, the rubber stress relaxes, causing a drop in pressure and rendering the seal ineffective. Casting seals, being a one-time molding process, require the removal of the cast sealant for subsequent maintenance, leading to cumbersome disassembly and reassembly. Furthermore, both elastomeric compression seals and cast seals are customized based on the number of cables, making them unsuitable for sealing varying numbers of cables. Therefore, we propose a new cable inlet and outlet sealing interface for distribution boxes. Summary of the Invention

[0004] The purpose of this invention is to provide a sealed interface for cable entry and exit in a distribution box to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a cable inlet / outlet sealing interface for a distribution box, comprising a distribution cabinet, a sealing opening in the distribution cabinet, an outer ring fixedly connected to the sealing opening, a conical sleeve made of rigid material inside the outer ring, and the outer ring and the conical sleeve being sealed together by an elastic section, a filler being filled between the outer ring and the conical sleeve, and an adjusting member being provided between the conical sleeve and the outer ring for adjusting the conical sleeve to expand and contract along the elastic section, thereby changing the size of the gap between the conical sleeve and the outer ring, and a plug for inserting cables being provided inside the conical sleeve; a sealing cover is fitted on the outer ring outside the distribution cabinet, and a conical sleeve is provided on the sealing cover, with a plurality of plugging bladders inside the conical sleeve for filling the gaps between cables, and a shrink ring is provided on the outer side of the conical sleeve, the shrink ring sliding from the end with the smaller diameter of the conical sleeve opening to the end with the larger diameter of the opening to compress the plugging bladders, and a fixing member for fixing the shrink ring being provided outside the conical sleeve.

[0006] Preferably, the adjusting component includes a hinge seat installed on the outside of the conical sleeve, a hinge plate is installed on the hinge seat, and two opening diagonal rods are hinged on the hinge plate. The free ends of the opening diagonal rods respectively abut against the inner wall of the outer ring sleeve. The two opening diagonal rods can move towards or away from each other, so that the conical sleeve can be opened or retracted along the elastic section. The two opening diagonal rods are provided with arc-shaped adjustment plates, and the arc-shaped adjustment plates are provided with multiple adjustment holes. The opening diagonal rods and the adjustment holes are fixed by pins.

[0007] Preferably, the conical sleeve has an installation step at its small-diameter port, and the plug body includes a plug plate glued to the installation step, with multiple plug holes for cables to pass through on the plug plate.

[0008] Preferably, the connector includes a fixed mesh plate disposed at the small-diameter port of the conical sleeve. The outer ring of the fixed mesh plate is provided with an elastic ring, and the outer side of the elastic ring is fixedly connected to the inner wall of the small-diameter port of the conical sleeve. The fixed mesh plate is distributed with multiple intersecting grooves, and the cable can pierce the grooves and be fixed therein.

[0009] Preferably, both ends of the outer ring are provided with threaded sections. The outer ring is inserted into the sealing port, and both ends of the outer ring are threadedly connected to the threaded sections through a fixing ring. The fixing ring is provided with a insertion groove, and the insertion groove is provided with an insertion strip. A sealing gasket that seals and fits tightly with the power distribution cabinet is connected to the insertion strip.

[0010] Preferably, the outer ring sleeve is fixed to the sealing opening by an adhesive.

[0011] Preferably, the sealing cap is threadedly connected to the threaded section on the outer ring sleeve, and the fixing component includes multiple guide fixing rods installed on the sealing cap, with the guide fixing rods sliding through the shrink ring and the guide fixing rods and shrink ring being fixed by fixing nuts.

[0012] Preferably, the contact surface between the shrink ring and the outer side of the tapered sleeve is a silicone material layer, the outer side of the shrink ring is a rigid material, and a compression spring is sleeved on the outer side of the guide fixing rod. One end of the compression spring is connected to the bottom of the shrink ring, and the other end of the compression spring is connected to the sealing cap.

[0013] Preferably, the filler is a rubber body adapted to the gap between the conical sleeve and the outer ring sleeve, the rubber body has a hollow structure, and the rubber body is provided with an inflation / deflation port.

[0014] Preferably, the surface of the plugging bladder facing the cable is an arc-shaped soft rubber surface, and the inner wall of the plugging bladder facing the conical sleeve is an inclined hard surface, and the conical sleeve is covered with a dry sealing sleeve.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This invention designs a multi-layered sealing structure by combining an internal adjustable conical sleeve and an external compressible plugging bladder. Through mechanical adjustment, the clamping force on the cable bundle can be actively changed, and irregular gaps between cables can be filled in real time. This significantly improves the adaptability to different cable quantities, sizes, and environmental changes, and fundamentally solves the problems of poor sealing and easy failure of traditional interfaces.

[0017] 2. This invention: The overall design transforms complex sealing adjustments into simple mechanical operations. Internally, a lever mechanism enables labor-saving and precise tightness adjustment and locking. Externally, spring pre-tensioning and threaded locking quickly complete gap filling. In particular, the fixed grid plate solution supports cable insertion at any position and one-time overall locking, which greatly simplifies the process and reduces the technical threshold and time cost of construction and subsequent maintenance.

[0018] 3. The system of this invention adopts a design concept that combines rigid support and elastic sealing, and selects materials with precision for the function of each component. Key components are made of high-strength engineering plastics, weather-resistant rubber and corrosion-resistant metals to ensure structural stability and sealing durability. The added dry protective sleeve and other designs further enhance the long-term reliability and service life of the interface under harsh conditions such as humidity and temperature difference. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the power distribution cabinet and the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 3 This is a schematic diagram of a partial explosion structure according to Embodiment 1 of the present invention;

[0022] Figure 4 This is a schematic diagram of a partial explosion structure according to Embodiment 2 of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the tapered sleeve and the fixing component of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of the outer ring sleeve and the adjusting component of the present invention;

[0025] Figure 7 This is a schematic diagram of a partial explosion at the outer ring of the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of the outer ring sleeve and conical sleeve after the filling material is removed;

[0027] Figure 9 This is a schematic diagram of the structure of the plug plate of the present invention above the outer ring sleeve;

[0028] Figure 10 This is a schematic diagram of the fixed mesh plate and cable structure of the present invention;

[0029] Figure 11 for Figure 5 Enlarged view of area A in the middle;

[0030] Figure 12 for Figure 7 Enlarged view of area B in the middle;

[0031] Figure 13 for Figure 7 Enlarged view of the area at point C;

[0032] Figure 14 for Figure 9 Enlarged view of the area at point D;

[0033] Figure 15 for Figure 10 Enlarged schematic diagram of the area at point E in the middle.

[0034] In the diagram: 1. Distribution cabinet body; 2. Outer ring; 3. Conical sleeve; 4. Elastic section; 5. Filler; 6. Adjusting component; 7. Insertion body; 8. Shrink ring; 9. Fixing component; 11. Sealing port; 21. Sealing cover; 22. Conical sleeve; 23. Plug-in bladder; 24. Threaded section; 25. Fixing ring; 26. Insertion groove; 27. Insertion strip; 28. Sealing gasket; 29. ​​Drying sealing sleeve; 31. Mounting step; 51. Air filling / draining port; 61. Hinge seat; 62. Hinge plate; 63. Spreading diagonal bar; 64. Arc-shaped adjusting plate; 65. Adjusting hole; 66. Pin; 71. Insertion plate; 72. Insertion hole; 73. Fixing grid plate; 74. Elastic ring; 91. Guide fixing rod; 92. Fixing nut; 93. Compression spring; 231. Arc-shaped soft rubber surface; 232. Inclined hard surface. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] This invention provides a technical solution: a cable inlet and outlet sealing interface for a distribution box, the core of which is to achieve multi-layer, adjustable sealing by combining an adjustable conical sleeve structure, a filler body, and an external compressible plug bladder, thereby adapting to different numbers and diameters of cables and ensuring a long-term reliable sealing effect.

[0037] The following will describe in detail the specific structure, working principle, material selection and operation process of the present invention in conjunction with two main plug-in implementation methods. Implementation method one uses a replaceable plug-in plate, and implementation method two uses a fixed grid plate with elastic rings. The two implementation methods share the same basic structure, but differ in the cable fixing and adaptive adjustment mechanism.

[0038] Implementation method 1: Use a sealed interface with a replaceable plug plate.

[0039] like Figure 3 As shown, the cable inlet and outlet sealing interface of the distribution box in this embodiment mainly includes an outer ring sleeve 2, a conical sleeve 3, an elastic section 4, a filler 5, an adjusting component 6, a plug-in body 7, a sealing cover 21, a conical sleeve 22, a plugging bladder 23, a shrink ring 8, and a fixing component 9.

[0040] The distribution cabinet 1 and the sealing port 11 are cabinets for which the sealing interface is to be installed. A circular sealing port 11 is provided on its side wall or bottom. The sealing port 11 serves as a channel for cables to enter and exit the cabinet. Its size is determined according to the total diameter of the expected cable bundle, and is usually slightly larger than the maximum diameter of the cable bundle that needs to be passed through.

[0041] The outer ring 2 and its fixing method: The outer ring 2 is a rigid cylinder, preferably made of corrosion-resistant and high-strength materials, such as stainless steel (e.g., 304 stainless steel), engineering plastics (e.g., polyamide PA66, polycarbonate PC), or aluminum alloy with anti-corrosion surface treatment. The outer ring 2 is fixed to the sealing port 11 by one of the following two methods:

[0042] Threaded fixing type (preferred): Both ends of the outer ring sleeve 2 are machined with external threads to form threaded sections 24. During installation, the outer ring sleeve 2 is inserted into the sealing port 11 from the outside or inside of the cabinet. On the inside and outside sides of the cabinet, the two fixing rings 25 are screwed into the corresponding threaded sections 24 respectively. Tightening the fixing rings 25 will clamp and fix the outer ring sleeve 2 to the cabinet wall. To further improve the sealing performance, the inner side of the fixing ring 25 is provided with an annular insertion groove 26. An annular insertion strip 27 is embedded in the groove. The insertion strip 27 is connected to a sealing gasket 28. When the fixing ring 25 is tightened, the sealing gasket 28 (the material can be nitrile rubber NBR or silicone rubber) is tightly pressed onto the wall of the distribution cabinet 1 to achieve a static seal between the outer ring sleeve 2 and the cabinet, preventing water seepage along the cabinet wall.

[0043] Adhesive fixing: As a simplified alternative, high-performance epoxy resin adhesive or polyurethane sealant can be used to directly bond and fix the outer wall of the outer ring 2 to the inner wall of the sealing port 11. This method is suitable for thin-walled cabinets where threaded operation is inconvenient or for one-time installation scenarios.

[0044] The conical sleeve 3 and the elastic section 4 are fitted together. The conical sleeve 3 is a truncated conical sleeve made of rigid material, and its axis coincides with the axis of the outer ring sleeve 2. The rigid material can be ABS engineering plastic, POM (polyoxymethylene) or rigid PVC to ensure its shape stability under stress. The large-diameter end of the conical sleeve 3 is sealed to the inner wall of the outer ring sleeve 2 through the elastic section 4. The elastic section 4 is a flexible, stretchable annular membrane structure, preferably made of ethylene propylene diene monomer (EPDM) or chloroprene rubber (CR), which has good weather resistance, elasticity and tear resistance. One end of the elastic section 4 is bonded or vulcanized to the outer edge of the large end of the conical sleeve 3, and the other end is bonded and sealed to a specific annular groove or plane on the inner wall of the outer ring sleeve 2. The elastic section 4 forms a stretchable flexible sealed cavity sidewall, allowing the conical sleeve 3 to move within a certain range relative to the outer ring sleeve 2 in the axial direction (expanding outward or retracting inward).

[0045] The filler 5 is located in the annular gap between the inner wall of the outer ring sleeve 2 and the outer wall of the cone sleeve 3. In a preferred embodiment, it is a hollow rubber body adapted to the shape of the annular gap, with an internal cavity structure. The rubber material can be foamed silicone rubber or closed-cell EPDM sponge, which has both elasticity and compressibility. The filler 5 is provided with an air inlet 51, which is usually a nozzle with a one-way valve or sealing nut. In the initial state or when the seal needs to be loosened, a small amount of air can be injected into the cavity through the air inlet 51 to make the filler 5 expand slightly and reduce the pressure on the cone sleeve 3. When it is necessary to tighten, some air can be extracted from the air inlet 51, so that the filler 5 contracts and hardens under the external atmospheric pressure, thereby pressing the cone sleeve 3. The main function of the filler 5 is to assist the adjustment member 6, provide continuous radial clamping force after the gap is adjusted, and further block moisture that may pass through the gap.

[0046] Adjusting component 6 is used to precisely control the extension and retraction of the conical sleeve 3 along the elastic segment 4, thereby changing the size of the annular gap between the conical sleeve 3 and the outer ring sleeve 2, and thus changing the small port diameter of the conical sleeve 3. Its specific structure and operation process are as follows:

[0047] The adjusting component 6 mainly includes a hinge seat 61, a hinge plate 62, two spreading diagonal rods 63, an arc-shaped adjusting plate 64, an adjusting hole 65, and a pin 66.

[0048] The hinge seat 61 is fixedly installed on the outer side of the cone sleeve 3 at the middle or larger end by screws or clips, and the hinge plate 62 is fixed on the hinge seat 61. One end of the two spreading diagonal rods 63 is hinged to the same point or two very close points of the hinge plate 62 by a pin, so that the two spreading diagonal rods 63 can rotate around the hinge point like scissors. The free ends of the two spreading diagonal rods 63 (the ends away from the hinge point) respectively abut against the inner wall of the outer ring sleeve 2. In order to reduce friction and avoid damage to the inner wall, the free ends of the spreading diagonal rods 63 can be fitted with sliders made of nylon or polytetrafluoroethylene (PTFE). The arc-shaped adjustment plate 64 is connected between the two spreading diagonal rods 63, and its curvature is similar to the outer contour of the cone sleeve 3. A series of equally spaced adjustment holes 65 are opened on the arc-shaped adjustment plate 64 along its arc length direction.

[0049] Spreading process (increasing the small port diameter of the cone sleeve): When it is necessary to accommodate more or thicker cables, the cone sleeve 3 needs to be spread outwards towards the outer ring 2. The operator first pulls out the currently fixed pin 66, and then pulls the upper middle part of the two spreading diagonal rods 63 to both sides by hand or tool, so that the included angle of the two spreading diagonal rods 63 increases, that is, to achieve "reverse movement". Since the free end of the spreading diagonal rod 63 abuts against the inner wall of the outer ring 2 as a fulcrum, according to the lever principle, the spreading diagonal rod 63 generates an outward pushing force on the hinge plate 62. This pushing force is transmitted to the cone sleeve 3 through the hinge seat 61, forcing The conical sleeve 3 overcomes the elastic force of the elastic section 4 and the resistance of the filler 5, and moves outward from the cabinet. As the conical sleeve 3 moves outward, the elastic section 4 is stretched, the gap between the conical sleeve 3 and the outer ring sleeve 2 increases, and the small diameter port diameter of the conical sleeve 3 also expands. When adjusted to the required position, the pin 66 is inserted into the pair of adjustment holes 65 corresponding to the two spreading diagonal rods 63 at this time (the holes on the arc-shaped adjustment plate are designed in pairs to ensure that the pin can pass through the corresponding parts on the two spreading diagonal rods at the same time). The pin 66 locks the relative angle of the two spreading diagonal rods 63, thereby fixing the position of the conical sleeve 3.

[0050] Retraction process (reducing the small port diameter of the cone sleeve): When it is necessary to tighten the seal or reduce the cable, the opposite operation is performed. Pull out the pin 66, and push the two spreading diagonal rods 63 inward by hand or tool so that they "move towards each other" and the included angle decreases. At this time, the spreading diagonal rods 63 generate an inward pulling force on the hinge plate 62, pulling the cone sleeve 3 to retract into the cabinet. The elastic section 4 assists this process under the action of its own elastic recovery force and the expansion force of the filler 5. The inward movement of the cone sleeve 3 causes the gap between it and the outer ring sleeve 2 to decrease, and the small port diameter also shrinks. After reaching the appropriate position, insert the pin 66 to fix it.

[0051] Through the above adjustments, the tension of the internal space of the conical sleeve 3 can be changed steplessly or in stages, providing basic support for the internal connector 7.

[0052] Plug-in body 7 (plug-in plate type): In this embodiment, a ring of inwardly protruding mounting steps 31 is machined on the inner wall of the small diameter port of the cone sleeve 3. The connector 7 is mainly composed of a circular connector plate 71. The connector plate 71 is preferably made of a material with certain flexibility and strength, such as polyurethane (PU) board, soft PVC board or rubber-reinforced fiberboard. Its outer diameter matches the mounting step 31 and is fixed to the mounting step 31 by high-strength adhesive (such as silicone structural adhesive). According to the actual engineering requirements, multiple connector holes 72 of different diameters are pre-cut on the connector plate 71. These connector holes 72 can be arranged in concentric rings or in a matrix. The inner diameter of each connector hole 72 is slightly smaller than the outer diameter of the corresponding cable. The elasticity of the material tightens the cable to achieve the first seal. The user can select a connector plate 71 with the corresponding number and size of connector holes 72 according to the number and diameter of the cables to be passed through. During installation, the cables are passed through the corresponding connector holes 72 one by one. The cable and the hole wall make close contact and friction to form a seal. For connector holes 72 that are not used temporarily, they can be plugged with matching rubber plugs.

[0053] External sealing assembly (second seal): The sealing cap 21 is an end cap that fits onto the outer portion of the outer ring 2 located on the outside of the cabinet. It is threadedly connected to the threaded section 24 at the end of the outer ring 2. A tapered sleeve 22 extends from the center of the sealing cap 21 outward from the cabinet. The inner cavity of the sleeve is conical, with the larger diameter end facing the cabinet and the smaller diameter end facing outward. The tapered sleeve 22 and the sealing cap 21 can be integrally injection molded (material such as PC / ABS alloy) or manufactured separately and then assembled.

[0054] On the inner wall of the tapered sleeve 22, multiple independent plugging bladders 23 are evenly arranged circumferentially. The plugging bladders 23 are hollow flexible bags that can be filled with gel, grease or air. The materials used are as follows: the surface facing the cable contact is an arc-shaped soft rubber surface 231, made of very soft silicone or thermoplastic elastomer (TPE) with a high coefficient of friction, to adapt to the irregularity of the cable surface and not damage the cable insulation layer; the side facing the inner wall of the tapered sleeve 22 is an inclined hard surface 232, made of slightly hard rubber or plastic with good adhesion to the tapered sleeve 22, to ensure effective pressure transmission when under force.

[0055] The contraction ring 8 is fitted over the tapered sleeve 22. The inner ring surface of the contraction ring 8, in contact with the outer tapered surface of the tapered sleeve 22, is made of silicone to increase friction and prevent scratching the tapered surface. The outer shell of the contraction ring 8 is made of a rigid material, such as metal or hard plastic, to withstand the locking force. The fixing member 9 is used to drive and fix the contraction ring 8. The fixing member 9 includes multiple (usually 3-4) guide fixing rods 91 vertically mounted on the sealing cover 21. The guide fixing rods 91 are parallel to the axis of the tapered sleeve 22. The contraction ring 8 has corresponding through holes and can slide on the guide fixing rods 91. A compression spring 93 is fitted on the guide fixing rod 91. One end of the compression spring 93 presses against the sealing cover 21, and the other end presses against the bottom of the contraction ring 8, providing a preload force to the contraction ring 8 towards the smaller end of the tapered sleeve 22. The end of the guide fixing rod 91 is threaded. By tightening the fixing nut 92, the spring force can be countered, and the contraction ring 8 can be locked in any position.

[0056] After the cable passes through the plug plate 71, it continues through the tapered sleeve 22. Multiple cables may have irregular gaps between them within the tapered sleeve 22. Loosening the fixing nut 92, under the action of the compression spring 93, causes the contraction ring 8 to tend to slide towards the smaller end of the tapered sleeve 22. Since the tapered sleeve 22 is tapered, as the contraction ring 8 slides towards the smaller end, its inner diameter decreases, thus uniformly squeezing the wall of the tapered sleeve 22 from the outside. The wall of the tapered sleeve 22 deforms inward, compressing the inner plugging bladder 23. After being compressed, the plugging bladder 23... The soft, curved rubber surface 231 expands and fills the gaps between the cables until all gaps are completely filled. At the same time, the plugging bladder 23 also exerts a uniform clamping force on the cable sheath. After observing that the sealing effect is good, tighten the fixing nut 92 to firmly fix the shrink ring 8 in this position, thereby maintaining the compressive force on the plugging bladder 23 and forming a reliable second dynamic seal. The drying sealing sleeve 29 (such as a breathable and waterproof cloth sleeve containing desiccant) is put on the outside of the tapered sleeve 22 to absorb moisture that may condense and provide additional environmental protection.

[0057] Select an outer ring 2 with a suitable outer diameter according to the size of the sealing opening 11 of the distribution box. Based on the number and diameter of the cables to be inserted, pre-select or customize a plug plate 71 with corresponding plug holes 72. Insert the outer ring 2 into the sealing opening 11 of the cabinet and secure it to the cabinet by means of threaded fixing or adhesive fixing.

[0058] Place the conical sleeve 3 (with the elastic section 4 already connected) with the glued plug plate 71 into the outer ring sleeve 2, and seal and glue the outer edge of the elastic section 4 to the inner wall of the outer ring sleeve 2. Install the various parts of the adjustment piece 6, put the filler 5 into the gap, and connect the inflation / deflation port 51.

[0059] Based on the estimated size of the cable bundle, the approximate diameter of the small end of the cone sleeve 3 is initially set by operating the adjustment component 6 (opening or retracting the opening diagonal bar 63 and fixing it with the pin 66), and the hardness of the filler 5 can be finely adjusted by the air inlet 51.

[0060] The cables are passed sequentially from the outside of the cabinet through the conical sleeve 22 of the sealing cover 21 and the corresponding plug-in hole 72 on the plug-in plate 71, and then into the cabinet. Ensure that each cable fits tightly with its plug-in hole 72. After all the cables are threaded, the adjusting piece 6 is finely adjusted again to moderately tighten the small end diameter of the conical sleeve 3. The plug-in plate 71 is used to further tighten the cables. Air can be drawn from the filler 5 to harden it and enhance the locking effect.

[0061] Screw the sealing cap 21 (with the conical sleeve 22, plug bladder 23, shrink ring 8, guide fixing rod 91, compression spring 93, etc. already installed) onto the external thread section 24 of the outer ring sleeve 2. Tighten the sealing cap 21 to press it against the end face of the outer ring sleeve 2. Then, loosen the fixing nut 92 and observe the compression spring 93 pushing the shrink ring 8 to automatically squeeze the conical sleeve 22, so that the plug bladder 23 fills the cable gap. If the pressure is insufficient, you can manually push the shrink ring 8 a little further towards the small end of the conical sleeve 22, and then tighten the fixing nut 92 to lock it in place.

[0062] Check that all fixing points (fixing ring 25, pin 66, fixing nut 92, etc.) are secure. A water spray test can be conducted externally to verify the sealing effect.

[0063] The fixed grid plate 73 is a plate fixed at the small diameter port of the conical sleeve 3. Unlike the plug plate 71 in Embodiment 1, it is not pre-drilled. Its plate body is preferably made of a semi-rigid material that is easy to cut and puncture, such as a medium-hardness polyurethane board, polyethylene (PE) board, or rubber composite material. The plate body is covered with a dense, crisscrossing network of grooves by molding or engraving. These grooves divide the plate surface into many small grid units, but do not completely penetrate the plate body, so the plate body still maintains overall sealing.

[0064] The elastic ring 74 is a ring with good elasticity and extensibility. Its material can be natural rubber or high-elasticity TPU (thermoplastic polyurethane). The outer edge of the elastic ring 74 is fixedly connected to the inner wall of the small-diameter port of the cone sleeve 3 by adhesive or mechanical snap-fit. The inner edge of the elastic ring 74 is firmly connected to the outer edge of the fixed mesh plate 73 by adhesive or vulcanization. Therefore, the fixed mesh plate 73 is "suspended" inside the small port of the cone sleeve 3 by the elastic ring 74, and its position floats within a small range with the deformation of the elastic ring 74.

[0065] When installing cables, there is no need to pre-select a plug plate. The operator can directly pierce the corresponding grid groove on the fixing grid plate 73 with the cable head according to the cable position. Since the plate material has a certain toughness, the cable can squeeze through the material in the groove and pass through. The pierced grid material tightly wraps the cable sheath under the action of elasticity, forming an initial seal. The cable can be inserted at any position on the plate, and the position selection is extremely flexible.

[0066] When the cone sleeve 3 is pushed outward by the adjusting member 6 (e.g., to accommodate more cables or loosen the seal): the small port diameter of the cone sleeve 3 increases. Since the outer side of the elastic ring 74 is fixed to the inner wall of the small port, the elastic ring 74 is radially stretched, and its diameter increases. The inner side of the elastic ring 74 is connected to the outer ring of the fixed mesh plate 73. Therefore, the fixed mesh plate 73 is subjected to an outward stretching force from all sides. This force tends to "enlarge" the holes pierced by the cable on the fixed mesh plate 73, thereby reducing the clamping force of the plate material on the cable, making it easier for the cable to be inserted or its position adjusted, and temporarily reducing the sealing pressure.

[0067] When the conical sleeve 3 is retracted inward via the adjusting component 6 (for example, after cable installation and sealing): the small port diameter of the conical sleeve 3 decreases, the outer side of the elastic ring 74 moves inward along with the inner wall of the small port, and the elastic ring 74 contracts radially under its own elastic restoring force, resulting in a smaller ring diameter. This causes the elastic ring 74 to exert a compressive force towards the center on the outer ring of the fixed mesh plate 73, causing the fixed mesh plate 73 to converge towards the center as a whole. All the material around the holes pierced by the cables on the plate is subjected to pressure towards the center, thus more tightly wrapping and compressing each cable, significantly enhancing the sealing pressure.

[0068] During the adjustment of the cone sleeve 3, the state of the filling body 5 (inflation and deflation) can be synchronized. When retracting and locking, the air inside the filling body 5 is extracted to harden it, which not only helps to lock the position of the cone sleeve 3, but its hardened body also indirectly supports the wall of the cone sleeve 3, making the contraction force more evenly transmitted.

[0069] This invention achieves dynamic and tight sealing of cable bundles through a dual, adjustable sealing mechanism consisting of an internal adjustable conical sleeve and a plug-in body, and an external compressible plugging bladder. This effectively solves the sealing problem of incoming and outgoing lines in cases of multiple cables and varying specifications. The mechanical lever structure of the adjusting component 6 and the spring pre-tightening spiral locking structure of the fixing component 9 make the adjustment process labor-saving, precise, and reliable in locking.

[0070] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0071] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sealing interface for cable inlet and outlet of a distribution box, comprising a distribution cabinet (1), wherein the distribution cabinet (1) has a sealing port (11), characterized in that: An outer ring sleeve (2) is fixedly connected to the sealing port (11). A cone sleeve (3) made of hard material is provided inside the outer ring sleeve (2). The outer ring sleeve (2) and the cone sleeve (3) are sealed together through an elastic section (4). A filler (5) is filled between the outer ring sleeve (2) and the cone sleeve. An adjusting member (6) is provided between the cone sleeve (3) and the outer ring sleeve (2). The adjusting member (6) is used to adjust the cone sleeve (3) to extend and retract along the elastic section (4) so ​​that the gap between the cone sleeve (3) and the outer ring sleeve (2) changes. A plug-in body (7) for plugging in cables is provided inside the cone sleeve (3). The outer ring sleeve (2) is fitted with a sealing cover (21) on the outside of the distribution cabinet (1). The sealing cover (21) is provided with a tapered sleeve (22). The tapered sleeve (22) is provided with multiple plugging bladders (23) for filling the gaps between cables. The tapered sleeve (22) is provided with a shrinking ring (8) on the outside. The shrinking ring (8) slides along the tapered sleeve (22) from the end with the smaller opening diameter to the end with the larger opening diameter to squeeze the plugging bladders (23). The tapered sleeve (22) is provided with a fixing piece (9) for fixing the shrinking ring (8).

2. The cable inlet and outlet sealing interface of a distribution box according to claim 1, characterized in that: The adjusting component (6) includes a hinge seat (61) installed on the outside of the conical sleeve (3). A hinge plate (62) is installed on the hinge seat (61), and two opening diagonal rods (63) are hinged on the hinge plate (62). The free ends of the opening diagonal rods (63) respectively abut against the inner wall of the outer ring sleeve (2). The two opening diagonal rods (63) can move towards each other or away from each other, so that the conical sleeve (3) can be opened or retracted along the elastic section (4). The two opening diagonal rods (63) are provided with arc-shaped adjustment plates (64), and the arc-shaped adjustment plates (64) are provided with multiple adjustment holes (65). The opening diagonal rods (63) and the adjustment holes (65) are fixed by pins (66).

3. The cable inlet and outlet sealing interface of a distribution box according to claim 2, characterized in that: The cone sleeve (3) has an installation step (31) at its small diameter port. The plug body (7) includes a plug plate (71) glued to the installation step (31). The plug plate (71) has multiple plug holes (72) for cables to pass through.

4. The cable inlet and outlet sealing interface of a distribution box according to claim 2, characterized in that: The connector (7) includes a fixed grid plate (73) provided at the small diameter port of the conical sleeve (3). The outer ring of the fixed grid plate (73) is provided with an elastic ring (74), and the outer side of the elastic ring (74) is fixedly connected to the inner wall of the small diameter port of the conical sleeve (3). The fixed grid plate (73) has multiple intersecting grooves, and the cable can pierce the grooves and be fixed therein.

5. A sealing interface for cable inlets and outlets in a distribution box according to claim 1, characterized in that: Both ends of the outer ring sleeve (2) are provided with threaded sections (24). The outer ring sleeve (2) is inserted into the sealing port (11), and both ends of the outer ring sleeve (2) are threadedly connected to the threaded sections (24) through the fixing ring (25). The fixing ring (25) is provided with a plug groove (26), and a plug strip (27) is provided at the plug groove (26). A sealing gasket (28) that is sealed and fitted to the power distribution cabinet (1) is connected to the plug strip (27).

6. The cable inlet and outlet sealing interface of a distribution box according to claim 1, characterized in that: The outer ring sleeve (2) is fixed to the sealing port (11) by adhesive.

7. A sealing interface for cable inlet and outlet of a distribution box according to claim 5, characterized in that: The sealing cap (21) is threadedly connected to the threaded section (24) on the outer ring sleeve (2). The fixing member (9) includes multiple guide fixing rods (91) installed on the sealing cap (21), and the guide fixing rods (91) slide through the shrink ring (8). The guide fixing rods (91) and the shrink ring (8) are fixed by fixing nuts (92).

8. A sealed interface for cable inlet and outlet of a distribution box according to claim 7, characterized in that: The contact surface between the shrink ring (8) and the outer side of the tapered sleeve (22) is a silicone material layer, the outer side of the shrink ring (8) is a rigid material, and the outer side of the guide fixing rod (91) is fitted with a compression spring (93). One end of the compression spring (93) is connected to the bottom of the shrink ring (8), and the other end of the compression spring (93) is connected to the sealing cover (21).

9. A sealed interface for cable inlet and outlet of a distribution box according to claim 1, characterized in that: The filler (5) is a rubber body that is adapted to the gap between the conical sleeve (3) and the outer ring sleeve (2). The rubber body has a hollow structure and is provided with an air inlet (51).

10. A sealing interface for cable inlet and outlet of a distribution box according to claim 1, characterized in that: The surface of the plugging bladder (23) facing the cable is an arc-shaped soft rubber surface (231), and the inner wall of the plugging bladder (23) facing the conical sleeve (22) is an inclined hard surface (232). The conical sleeve (22) is covered with a dry sealing sleeve (29).

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