A power distribution cabinet with cable sealing device

Abstract

The application relates to a power distribution cabinet with a cable sealing device and relates to the technical field of power equipment. The power distribution cabinet comprises a power distribution cabinet main body, a sealing cylinder, an adapting ring, a lower pressing ring, a sealing ring and a sealing ring. The sealing cylinder is fixed to the outer side of the main body, the adapting ring is arranged on the inner wall of the through hole and the end face is provided with an annular tooth, the lower pressing ring is sleeved on the cable and the end face is provided with an annular tooth engaged with the adapting ring, the sealing ring is filled in the gap below the adapting ring, and the sealing ring is slidably arranged in the opening and pressurizes the sealing liquid between the adapting ring and the sealing ring. The application can drive the annular tooth to engage to form a rigid main seal through the sealing liquid pressure, reduce the extrusion force borne by the sealing ring, thereby solving the problem that the rubber sealing element is accelerated to age due to long-term high pressure, prolonging the service life of the device and improving the sealing reliability.

Description

Technical Field

[0001] This invention relates to the field of power distribution cabinet technology, and more specifically to a power distribution cabinet with a cable sealing device. Background Technology

[0002] Distribution cabinets, as the main switching equipment in cable networks, are widely used in industrial parks, residential communities, and commercial centers. Each distribution cabinet houses multiple components that need to be connected to the outside via cables to maintain its basic power distribution hub function. To ensure the waterproof and dustproof performance of the distribution cabinet, and to meet the sealing requirements of explosion-proof cabinets that require built-in positive pressure protective gas, the connection points between the cables and the distribution cabinet must be reliably sealed.

[0003] In existing technologies, distribution cabinets typically have multiple openings at the bottom for cables to pass through, and use sealing devices to seal the connection points between the cables and the distribution cabinet. There are two main common sealing methods: one uses rubber gaskets, achieved by forcefully pressing with bolts; the other uses sealing oil in conjunction with a sealing ring, relying on the sealing ring to withstand significant pressure to maintain the sealing space for the sealing oil and prevent leakage.

[0004] Both of the above solutions have significant shortcomings. The former relies on continuous high-pressure compression of the rubber gasket, which accelerates aging with the high-intensity use of rubber materials, leading to a gradual decline in sealing performance. The latter, although introducing a sealing fluid, still relies on the sealing ring bearing significant pressure to prevent oil leakage, essentially depending on the material strength and durability of the rubber products. In other words, both solutions apply the main sealing pressure directly to the rubber seals. The rubber components are under high compressive stress for extended periods, making them prone to permanent deformation and aging failure, resulting in a limited seal life and failing to extend the device's service life while ensuring sealing effectiveness.

[0005] Therefore, there is an urgent need for a cable sealing structure that can reduce the compressive stress on rubber seals and extend the service life of the sealing device while ensuring the sealing effect. Summary of the Invention

[0006] The purpose of this invention is to provide a power distribution cabinet with a cable sealing device, which can effectively solve the problem in the prior art that the cable sealing device is subject to accelerated aging due to long-term high compressive stress on the rubber seal, resulting in a limited sealing life.

[0007] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: A distribution cabinet with a cable sealing device includes a cabinet body, an opening at the bottom of the cabinet body for a cable to pass through, a sealing cylinder fixed on the outside of the cabinet body corresponding to the opening, and a through hole inside the sealing cylinder for the cable to pass through, the through hole being aligned with the opening; further comprising: An adapter ring is provided on the inner wall of the through hole. The outer circumferential surface of the adapter ring is sealed to the inner wall of the through hole. The end face of the adapter ring facing the main body of the power distribution cabinet is provided with annular teeth. A pressure ring is sleeved on the cable and located on the side of the adapter ring facing the main body of the distribution cabinet. The inner circumferential surface of the pressure ring is sealed to the outer wall of the cable. The end face of the pressure ring facing the adapter ring is provided with annular teeth that mesh with the annular teeth on the adapter ring to form a seal. A sealing ring is filled in the through hole between the end face of the adapter ring away from the main body of the distribution cabinet and the bottom of the sealing cylinder, and seals the gap between the inner wall of the through hole and the outer wall of the cable. A sealing ring is slidably fitted onto the cable and at least partially located within the opening. The sealing ring is in sealing contact with the inner wall of the opening and the outer wall of the cable. The through hole between the adapter ring and the sealing ring is filled with sealing fluid. The sealing ring can slide along the cable in a direction away from the main body of the distribution cabinet to pressurize the sealing fluid in the through hole.

[0008] In the aforementioned distribution cabinet with cable sealing device, the sealing cylinder includes a cylinder body and a cover disposed at one end of the cylinder body away from the main body of the distribution cabinet, and the cover is threadedly connected to the cylinder body.

[0009] In the above-mentioned distribution cabinet with cable sealing device, the sealing ring includes an integrally formed first sealing section and a second sealing section. The outer diameter of the second sealing section is larger than the outer diameter of the first sealing section to form a stepped surface. The bottom surface of the adapter ring abuts against the stepped surface. The first sealing section fills the gap between the adapter ring and the cable and extends to the space between the pressure ring and the cable.

[0010] The aforementioned distribution cabinet with cable sealing device also includes a limiting mechanism. The limiting mechanism is located inside the main body of the distribution cabinet and corresponds to the opening position. The limiting mechanism presses at least partially on the sealing ring to prevent the sealing ring from moving away from the sealing cylinder.

[0011] In the aforementioned distribution cabinet with cable sealing device, the limiting mechanism includes: a limiting post, which is axially adjustable to the main body of the distribution cabinet, and the top of the limiting post has a radially protruding abutment; a limiting member, which is slidably sleeved on the limiting post, and the limiting member at least partially presses against the sealing ring; and a spring, which is sleeved on the limiting post, with one end of the spring abutting against the abutment and the other end of the spring abutting against the limiting member.

[0012] In the aforementioned distribution cabinet with a cable sealing device, a fixing ring is also fitted on the cable, and the top of the lower pressure ring abuts against the bottom surface of the fixing ring.

[0013] In the aforementioned distribution cabinet with cable sealing device, a liquid passage port is provided on the fixing ring to connect the upper and lower spaces of the fixing ring.

[0014] In the above-mentioned distribution cabinet with cable sealing device, the sealing cylinder has a liquid storage chamber inside its wall, and the liquid storage chamber is connected to the through hole through multiple communication ports.

[0015] In the aforementioned distribution cabinet with cable sealing device, an air bladder is also provided inside the liquid storage chamber.

[0016] In the aforementioned distribution cabinet with cable sealing device, multiple connection ports are divided into at least upper connection ports and lower connection ports along the length of the cable.

[0017] Compared with the prior art, the advantages of the present invention are: The adapter ring is located on the inner wall of the through hole, and its outer circumferential surface is sealed to the inner wall of the through hole. The pressure ring is sleeved on the cable, and its inner circumferential surface is sealed to the outer wall of the cable. The end face of the adapter ring facing the main body of the distribution cabinet has annular teeth, and the end face of the pressure ring facing the adapter ring has annular teeth that mesh with it. This solves the problem in the prior art where the rubber seals bear all the axial compressive force, resulting in the seals being under high compressive stress for a long time and aging faster. When the sealing ring pressurizes the sealing fluid, the axial force is transmitted downward along the cable, pushing the annular teeth of the pressure ring and the annular teeth of the adapter ring to mesh with each other, forming a tortuous rigid sealing contact surface. This rigid contact surface bears most of the axial load from the sealing fluid pressure, and the tortuous meshing path greatly increases the friction resistance of fluid leakage, enabling effective sealing under relatively small contact stress. At the same time, since the rigid tooth surface bears the main load, the compressive force on the sealing ring located below the adapter ring is significantly reduced, avoiding permanent deformation and aging failure of the sealing ring due to long-term high compressive stress. Thus, while ensuring the sealing effect, the service life of the entire sealing device is greatly extended.

[0018] The sealing ring's placement means it doesn't bear the main axial pressure, serving only as a second line of defense to intercept small amounts of sealant leaking through the annular tooth meshing gap. Because the sealing ring operates in a low-pressure environment, its material aging rate is significantly slowed down. Simultaneously, it forms a double-layer sealing system within the entire sealing device—the rigid tooth surface acts as the main seal, providing pressure isolation, while the sealing ring acts as an auxiliary seal, offering backup protection. Working together, even if the rigid tooth surface experiences minor leakage due to fluctuations in operating conditions, the sealing ring can still effectively intercept it, ensuring the overall sealing reliability of the device.

[0019] The sealing fluid is filled in the through hole between the adapter ring and the sealing ring. When the sealing ring slides down, the sealing fluid is pressurized and penetrates into the micro gaps between the cable, the adapter ring, and the pressure ring. The incompressibility and hydrophobicity of the liquid form a liquid sealing barrier, filling the micro gaps that are difficult for solid seals to completely cover.

[0020] The rigid meshing surface of the ring teeth bears the main axial clamping force, reducing the compressive load on the sealing ring. After the sealing fluid is filled and pressurized, a positive pressure liquid barrier is formed above the rigid meshing surface, further reducing the sealing requirements on the sealing ring below. Under low-pressure conditions, the sealing ring only serves as a fallback seal, and its material aging rate is significantly slowed down. The synergistic effect of these three elements achieves a "pressure-graded" sealing system: the rigid tooth surface bears the structural pressure, the sealing fluid fills micro-gaps and acts as a hydrophobic barrier, and the sealing ring provides final interception. Each sealing element operates under its appropriate working conditions, avoiding the high-pressure accelerated aging problem caused by concentrating all sealing pressure on a single rubber component in existing technologies.

[0021] Furthermore, the sealing cylinder includes a cylinder body and a cap located at the end of the cylinder body away from the main body of the distribution cabinet. The cap is threadedly connected to the cylinder body. Adopting a split-type structural design, the cap is detachably connected to the end of the cylinder body. During installation, the sealing ring can be smoothly inserted into the designated position in the through hole from the bottom of the cylinder body, and then tightened by the cap. This allows for precise control of the initial pre-compression of the sealing ring through the screw-in depth of the cap, avoiding the uneven sealing problem caused by improper installation of the sealing component in the integral structure. Simultaneously, when the sealing ring needs to be replaced due to long-term use, only the cap needs to be unscrewed to remove the old sealing ring and replace it with a new one, without disassembling the entire sealing cylinder or cable. This significantly reduces maintenance difficulty and cost, giving the sealing device excellent maintainability. For distribution cabinet cable sealing structures that require long-term stable operation, this represents a significant practical improvement compared to existing integral sealing structures.

[0022] Furthermore, the sealing ring includes an integrally formed first sealing section and a second sealing section. The outer diameter of the second sealing section is larger than that of the first sealing section to form a stepped surface. The bottom surface of the adapter ring abuts against the stepped surface. The first sealing section fills the gap between the adapter ring and the cable and extends to the space between the pressure ring and the cable. The stepped surface provides a clear axial contact reference for the adapter ring, ensuring that the adapter ring will not move axially under the combined action of the sealing fluid pressure and the meshing force of the pressure ring, thereby ensuring the stability of the ring gear meshing. The first sealing section fills the gap between the adapter ring and the cable and extends to the space between the pressure ring and the cable, completely isolating the outer wall of the cable from the rigid adapter ring and the pressure ring. While protecting the cable, the elastic deformation of the first sealing section itself further fills the microscopic gaps in this area, enhancing the sealing effect. This structure, through the integrated stepped design of the sealing ring, simultaneously achieves the triple functions of axial limiting of the adapter ring, insulation protection of the cable, and auxiliary sealing.

[0023] Furthermore, a limiting mechanism is included. This limiting mechanism is located inside the main body of the distribution cabinet and corresponds to the opening position. The limiting mechanism at least partially presses against the sealing ring to prevent the sealing ring from moving away from the sealing cylinder. The limiting mechanism provides continuous and reliable mechanical constraint to the sealing ring. The reverse thrust generated after the sealing fluid is pressurized is transmitted to the limiting mechanism through the sealing ring, and is borne and offset by the limiting mechanism, rather than relying on the friction between the sealing ring and the inner wall of the opening or the elastic deformation of the sealing ring itself to maintain its position. This allows the static pressure of the sealing fluid to be maintained stably over a long period, ensuring that the annular tooth meshing surface of the adapter ring and the lower pressure ring is always in a compressed working state, and the sealing effect of the rigid sealing surface does not decrease over time. The introduction of the limiting mechanism structurally eliminates the potential positional displacement and pressure attenuation problems of the sealing ring during long-term use, providing structural protection for the pressure stability and long-term reliability of the entire sealing device.

[0024] Furthermore, the limiting mechanism includes: a limiting post, which is adjustablely connected to the main body of the distribution cabinet along its own axial direction, and the top of the limiting post has a radially protruding abutment portion; a limiting member, which is slidably sleeved on the limiting post, and the limiting member at least partially presses against the sealing ring; and a spring, which is sleeved on the limiting post, with one end of the spring abutting against the abutment portion and the other end of the spring abutting against the limiting member. By adjusting the axial installation position of the limiting post, the distance between the abutment portion and the limiting member can be changed, thereby precisely adjusting the compression of the spring and the preload applied to the sealing ring, so that the sealing ring obtains an appropriate and controllable clamping force. This ensures that the sealing ring will not come out of the opening due to insufficient clamping force, nor will it hinder the normal sliding of the cable or damage the surface of the sealing ring due to excessive clamping force. When the sealing ring undergoes slight deformation or wear during long-term use, only the axial position of the limiting post needs to be adjusted to increase the spring preload for compensation, re-establishing a reliable clamping state, and restoring the sealing performance without immediately replacing the sealing ring. The above structure upgrades the constraint method of the sealing ring from the single fixed compression in the existing technology to an adjustable elastic compression, which not only ensures a continuous and stable compression force output, but also provides the functions of adjustable force value and wear compensation.

[0025] Furthermore, a retaining ring is fitted onto the cable, with the top of the lower pressure ring abutting against the bottom surface of the retaining ring. The retaining ring provides a rigid axial limiting reference surface for the lower pressure ring, rather than relying on frictional self-locking between the lower pressure ring and the cable. During operation, the retaining ring continuously constrains the axial position of the lower pressure ring, ensuring that the annular gear engagement does not loosen due to pressure fluctuations or mechanical vibrations, thereby guaranteeing the long-term stability and reliability of the rigid sealing surface. By adding the retaining ring, the axial positioning method of the lower pressure ring is upgraded from frictional constraint between it and the cable to mechanical limiting constraint.

[0026] Furthermore, the fixing ring has a liquid passage opening connecting the upper and lower spaces of the fixing ring. During installation, the sealing fluid can flow smoothly into the area between the lower pressure ring and the adapter ring below the fixing ring through the liquid passage opening, ensuring that the microscopic gaps at the annular tooth meshing interface can be fully filled by the sealing fluid, thereby forming a complete liquid sealing barrier. This avoids the problem of insufficient fluid in the meshing area of ​​the lower pressure ring and the adapter ring due to the fixing ring blocking the fluid path, resulting in a reduced sealing effect. During operation, when the sealing fluid expands or contracts due to changes in ambient temperature or slight displacement of the cable, the liquid passage opening provides a channel for the sealing fluid to flow freely on both sides of the fixing ring, allowing the sealing fluid pressure to be evenly distributed. This prevents abnormal high or negative pressure from forming a closed liquid cavity on one side of the fixing ring, thus preventing abnormal pressure from causing overload impact on the sealing ring or sealing ring.

[0027] Furthermore, the sealing cylinder has a liquid storage chamber inside its wall, which is connected to the through hole via multiple connecting ports. The liquid storage chamber is connected to the sealing fluid space within the through hole via these connecting ports, forming a communicating vessel structure. When the sealing fluid in the through hole expands due to temperature increase, excess sealing fluid can enter the liquid storage chamber through the connecting ports for temporary storage. The increased volume is absorbed by the storage chamber's capacity, thus smoothing out pressure peaks and preventing abnormally high pressure from causing overload impact on the sealing ring, sealing ring, and annular tooth meshing surface. When the sealing fluid shrinks due to temperature decrease or decreases in volume due to minor leakage, the spare sealing fluid in the storage chamber can flow back into the through hole through the connecting ports to maintain the working fluid level and prevent insufficient sealing pressure due to fluid shortage. The design of multiple connecting ports ensures redundancy in the fluid path between the liquid storage chamber and the through hole. Even if some connecting ports are blocked by impurities, the remaining connecting ports can still maintain unobstructed fluid flow, ensuring the reliability of pressure balance and fluid compensation functions.

[0028] Furthermore, an airbag is also provided inside the liquid storage chamber. The airbag is sealed with compressible gas. When the sealing liquid expands in volume due to temperature rise or pressure impact and enters the liquid storage chamber through the connecting port, the liquid squeezes the airbag, compressing the gas inside. The high compressibility of the gas converts the increase in liquid volume into the pressure energy of the gas inside the airbag for storage. Compared with simply relying on the rigid space of the liquid storage chamber to contain the liquid, the intervention of the airbag greatly increases the effective buffer volume of the liquid storage chamber, and the pressure response curve is more gradual, which can effectively absorb instantaneous pressure peaks. When the temperature of the sealing liquid in the through hole drops and the volume shrinks, the compressed gas in the airbag expands and pushes the sealing liquid in the liquid storage chamber back into the through hole for replenishment, maintaining the stable working pressure of the sealing liquid. In addition, the airbag physically isolates the gas from the sealing liquid, avoiding the problem of gas directly entering the sealing liquid area in the through hole, forming bubbles, and affecting the continuity of the liquid sealing barrier.

[0029] Furthermore, the multiple connecting ports are divided into at least an upper connecting port and a lower connecting port along the length of the cable. During the initial liquid injection process, the sealing fluid gradually rises from the bottom of the through hole, with the lower connecting port receiving the fluid first. Air in the storage chamber is smoothly discharged to the through hole through the upper connecting port, avoiding the problem of air blockage caused by poor venting, which would significantly reduce the effective storage volume of the storage chamber. During the working stage, when the sealing fluid needs to be replenished or drained due to temperature changes, the upper and lower connecting ports are located at the high and low ends of the storage chamber, respectively, forming a convection channel. Liquid flow caused by density changes can enter and exit through the lower connecting port, while the upper connecting port acts as a pressure balancing port to keep the air pressure at the top of the storage chamber synchronized with the sealing fluid pressure in the through hole, making the replenishment and draining process smoother and the response faster. Attached Figure Description

[0030] Figure 1 This is a front view diagram of the overall structure of the present invention; Figure 2This is a front sectional view of the overall structure of the present invention; Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A; Figure 4 For the present invention Figure 2 Enlarged schematic diagram of the structure at point B; Figure 5 This is a schematic diagram showing the cooperation of the main body of the distribution cabinet, the sealing cylinder, the cable, the limiting mechanism, and the sealing ring of the present invention; Figure 6 This is a cross-sectional view of the internal structure of the sealing cylinder of the present invention; Figure 7 For the present invention Figure 6 Enlarged schematic diagram of the structure at point C; Figure 8 This is an exploded view of the sealing cylinder and cable sealing fit of the present invention.

[0031] The attached figures are labeled as follows: 1. Main body of the distribution cabinet; 2. Cylinder; 3. Cover; 4. Cable; 5. Limiting mechanism; 51. Limiting post; 52. Limiting component; 53. Spring; 6. Opening; 7. Sealing ring; 8. Liquid storage chamber; 9. Airbag; 10. Upper connecting port; 11. Lower connecting port; 12. Fixing ring; 13. Liquid outlet; 14. Lower pressure ring; 15. Adaptor ring; 16. Sealing ring; 17. Ring tooth. Detailed Implementation

[0032] A distribution cabinet with a cable sealing device includes a cabinet body 1, with an opening 6 at the bottom of the cabinet body 1 for a cable 4 to pass through, and a sealing cylinder fixed on the outer side of the cabinet body 1 corresponding to the opening 6. The sealing cylinder has a through hole for the cable 4 to pass through, and the through hole is aligned with the opening 6. The cabinet also includes: An adapter ring 15 is provided on the inner wall of the through hole. The outer peripheral surface of the adapter ring 15 is sealed to the inner wall of the through hole. The end face of the adapter ring 15 facing the main body 1 of the power distribution cabinet is provided with annular teeth 17. The pressure ring 14 is sleeved on the cable 4 and located on the side of the adapter ring 15 facing the main body 1 of the distribution cabinet. The inner circumferential surface of the pressure ring 14 is sealed to the outer wall of the cable 4. The end face of the pressure ring 14 facing the adapter ring 15 is provided with an annular tooth 17 that meshes with the annular tooth 17 on the adapter ring 15 to form a seal. The sealing ring 16 fills the through hole between the end face of the adapter ring 15 away from the main body 1 of the distribution cabinet and the bottom of the sealing cylinder, and seals the gap between the inner wall of the through hole and the outer wall of the cable 4. A sealing ring 7 is slidably fitted onto the cable 4 and is at least partially located within the opening 6. The sealing ring 7 is in sealing contact with the inner wall of the opening 6 and the outer wall of the cable 4. The through hole between the adapter ring 15 and the sealing ring 7 is filled with sealing fluid. The sealing ring 7 can slide along the cable 4 in a direction away from the main body 1 of the distribution cabinet to pressurize the sealing fluid in the through hole.

[0033] An adapter ring 15 is disposed on the inner wall of the through hole, and its outer circumferential surface is sealed to the inner wall of the through hole. A pressure ring 14 is sleeved on the cable 4, and its inner circumferential surface is sealed to the outer wall of the cable 4. The end face of the adapter ring 15 facing the main body 1 of the distribution cabinet has annular teeth 17, and the end face of the pressure ring 14 facing the adapter ring 15 has annular teeth 17 that mesh with it. This solves the problem in the prior art that the rubber seals bear all the axial clamping force, resulting in the seals being under high compressive stress for a long time and thus accelerating aging. When the sealing ring 7 pressurizes the sealing fluid, the axial force is transmitted downward along the cable 4, pushing the annular teeth 17 of the pressure ring 14 and the annular teeth 17 of the adapter ring 15 to mesh with each other, forming a tortuous rigid sealing contact surface. This rigid contact surface bears most of the axial load from the sealing fluid pressure, and the tortuous meshing path greatly increases the friction resistance of fluid leakage, so that effective sealing can be achieved under relatively small contact stress. At the same time, since the rigid tooth surface bears the main load, the compressive force on the sealing ring 16 located below the adapter ring 15 is significantly reduced, avoiding permanent deformation and aging failure of the sealing ring 16 due to long-term high compressive stress. Thus, while ensuring the sealing effect, the service life of the entire sealing device is greatly extended.

[0034] The arrangement of the sealing ring 16 means that it does not bear the main axial pressure, but only serves as a second sealing line to intercept a small amount of sealing fluid that leaks through the meshing gap of the ring teeth 17. Since the sealing ring 16 is in a low-pressure working environment, its material aging rate is significantly slowed down. At the same time, it forms a double-layer sealing system in the entire sealing device—the rigid tooth surface acts as the main seal to undertake the pressure isolation function, and the sealing ring 16 acts as an auxiliary seal to provide backup protection. The two work together, so even if the rigid tooth surface leaks a small amount due to fluctuations in operating conditions, the sealing ring 16 can still effectively intercept it, ensuring the overall sealing reliability of the device.

[0035] The sealing fluid is filled in the through hole between the adapter ring 15 and the sealing ring 7. When the sealing ring 7 slides down, the sealing fluid is pressurized and penetrates into the micro gaps between the cable 4, the adapter ring 15, and the pressure ring 14. The incompressibility and hydrophobicity of the liquid form a liquid sealing barrier, filling the micro gaps that are difficult for solid seals to completely cover.

[0036] The rigid meshing surface of the ring tooth 17 bears the main axial clamping force, reducing the compressive load on the sealing ring 16. After the sealing fluid is filled and pressurized, a positive pressure liquid barrier is formed above the rigid meshing surface, further reducing the sealing requirements on the sealing ring 16 below. Under low-pressure conditions, the sealing ring 16 only serves as a backstop seal, and its material aging rate is significantly slowed down. The synergistic effect of the three components achieves a "pressure-graded" sealing system: the rigid tooth surface bears the structural pressure, the sealing fluid fills the micro-gap and acts as a hydrophobic barrier, and the sealing ring 16 provides the final interception. Each sealing element operates under its suitable working conditions, avoiding the high-pressure accelerated aging problem caused by concentrating all sealing pressure on a single rubber component in existing technologies.

[0037] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] As the main switching equipment in cable networks, distribution cabinets are widely used in industrial parks, residential communities, and commercial centers. Each distribution cabinet houses multiple components that need to be connected to the outside world via cables to maintain its basic power distribution hub function. To ensure the waterproof and dustproof performance of the distribution cabinet, and to meet the sealing requirements of explosion-proof cabinets requiring built-in positive pressure protective gas, the connection between the cables and the distribution cabinet must be reliably sealed. In existing technologies, an opening for the cables to pass through is typically made at the bottom of the distribution cabinet, and sealing is achieved using either a rubber gasket under high pressure or sealing oil in conjunction with a sealing ring 7. However, the former relies on continuous high-pressure compression of the rubber material, which easily accelerates aging and leads to a decline in sealing performance; the latter, although introducing sealing fluid, still relies on the sealing ring 7 bearing significant pressure to maintain the sealed space. Essentially, it still does not escape the excessive dependence on the strength and durability of rubber materials, causing the seals to be under high compressive stress for extended periods, making them prone to permanent deformation and failure, and failing to extend the service life of the device while ensuring sealing effectiveness.

[0042] Based on the above issues, please refer to Figures 1 to 8 This application provides a distribution cabinet with a cable sealing device, including a distribution cabinet body 1. The bottom of the distribution cabinet body 1 has an opening 6 for a cable 4 to pass through. A sealing cylinder is fixed on the outer side of the distribution cabinet body 1 corresponding to the opening 6. A through hole for the cable 4 to pass through is opened inside the sealing cylinder, and the through hole is aligned with the opening 6. It also includes: an adapter ring 15, disposed on the inner wall of the through hole, with its outer circumferential surface sealingly connected to the inner wall of the through hole, and an annular tooth 17 on the end face of the adapter ring 15 facing the distribution cabinet body 1; and a pressure ring 14, sleeved on the cable 4 and located on the side of the adapter ring 15 facing the distribution cabinet body 1, with its inner circumferential surface tightly sealed to the outer wall of the cable 4. The sealing connection includes a pressure ring 14 with an annular tooth 17 on the end face of the adapter ring 15 that meshes with the annular tooth 17 on the adapter ring 15 to form a seal; a sealing ring 16, which fills the through hole between the end face of the adapter ring 15 away from the main body of the distribution cabinet 1 and the bottom of the sealing cylinder, and seals the gap between the inner wall of the through hole and the outer wall of the cable 4; a sealing ring 7, which is slidably fitted on the cable 4 and at least partially located in the opening 6, and the sealing ring 7 makes sealing contact with the inner wall of the opening 6 and the outer wall of the cable 4. The through hole between the adapter ring 15 and the sealing ring 7 is filled with sealing fluid, and the sealing ring 7 can slide along the cable 4 in a direction away from the main body of the distribution cabinet 1 to pressurize the sealing fluid in the through hole.

[0043] The main body 1 of the distribution cabinet is a box structure used to house and protect electrical components. Its material can be metal (such as cold-rolled steel plate or stainless steel) or high-strength engineering plastic. The specific shape and size can be set according to the actual installation environment and the layout of internal components. An opening 6 at the bottom of the main body 1 is used for cables 4 to pass through. The number, diameter, and arrangement of the openings 6 can be set according to the number and specifications of the cables 4 connected. A sealing cylinder is fixed to the outside of the main body 1 at the position corresponding to the opening 6, providing an installation carrier and housing space for subsequent sealing components. The sealing cylinder can be fixed to the main body 1 by welding, bolting, or snap-fit ​​connection, or it can be integrally formed with the main body 1. A through hole is opened inside the sealing cylinder, its axis aligned with the axis of the opening 6, forming a channel for the cables 4 to pass through. The inner diameter of the through hole is slightly larger than the outer diameter of the cables 4 to allow the cables 4 to pass through and to allow the installation of subsequent sealing components.

[0044] The adapter ring 15 is disposed on the inner wall of the through hole, and its outer circumferential surface is sealed to the inner wall of the through hole, serving a fixing and supporting function. The adapter ring 15 can be made of rigid or semi-rigid materials such as metal ring, hard plastic ring, or ceramic ring to bear the main structural stress. The end face of the adapter ring 15 facing the main body 1 of the distribution cabinet has annular teeth 17, which can be sawtooth, trapezoidal, or wavy. The sealing connection between the adapter ring 15 and the inner wall of the through hole can be achieved by interference fit, bonding, or the use of auxiliary sealing elements. The adapter ring 15 serves as the base of the rigid sealing surface, and its position is relatively fixed, used to cooperate with the lower pressure ring 14 to form the main sealing structure.

[0045] The pressure ring 14 is sleeved on the cable 4 and located on the side of the adapter ring 15 facing the main body 1 of the distribution cabinet. The inner circumferential surface of the pressure ring 14 is sealed to the outer wall of the cable 4. This connection can be a frictional seal generated by close contact, or an elastic seal achieved by an elastic liner embedded in the pressure ring 14. The end face of the pressure ring 14 facing the adapter ring 15 is provided with annular teeth 17. The shape of the annular teeth 17 matches the annular teeth 17 on the adapter ring 15, and the two can mesh with each other. When subjected to axial pressure, the annular teeth 17 of the pressure ring 14 and the annular teeth 17 of the adapter ring 15 mesh tightly, forming a tortuous rigid sealing path. The material of the pressure ring 14 can be the same as or different from that of the adapter ring 15. Under the pressure of the sealing fluid, the pressure ring 14 moves towards the adapter ring 15, achieving tooth surface meshing, thereby converting most of the axial load into the clamping force of the rigid contact surface.

[0046] The sealing ring 16 fills the through hole between the end face of the adapter ring 15 away from the main body 1 of the distribution cabinet and the bottom of the sealing cylinder. The function of the sealing ring 16 is to seal the gap between the inner wall of the through hole and the outer wall of the cable 4, serving as a second line of defense. The material of the sealing ring 16 can be rubber (such as nitrile rubber, fluororubber, silicone rubber), polyurethane, or other elastomer materials. Since the rigid engagement of the adapter ring 15 and the pressure ring 14 bears the main pressure, the compressive pressure of the environment in which the sealing ring 16 is located is significantly reduced, and it is only used to intercept the medium that may leak through the rigid tooth surface in a small amount.

[0047] The sealing ring 7 is slidably fitted onto the cable 4 and is at least partially located within the opening 6. The sealing ring 7 maintains sealed contact with both the inner wall of the opening 6 and the outer wall of the cable 4, forming a movable piston structure. The sealing ring 7 can be made of engineering plastic with self-lubricating properties or a rubber-coated metal ring to reduce sliding friction and ensure sealing. A sealing fluid is filled in the through-hole space between the adapter ring 15 and the sealing ring 7. The sealing fluid can be insulating oil, silicone oil, hydraulic oil, or other incompressible and hydrophobic liquids. When the sealing ring 7 slides along the cable 4 away from the main body of the distribution cabinet 1 (i.e., downwards), it compresses the sealing fluid in the through-hole, increasing its pressure. The high-pressure sealing fluid penetrates into the micro-gap to form a liquid barrier and simultaneously pushes the pressure ring 14 downwards, causing the annular teeth 17 of the adapter ring 15 to engage with the annular teeth 17 of the pressure ring 14.

[0048] By using the intermeshing annular teeth 17 provided on the end faces of the adapter ring 15 and the pressure ring 14, the traditional mode of relying solely on the rubber part to bear the entire axial clamping force is transformed into a graded load-bearing mode in which the rigid tooth surface bears the main load, the sealing fluid fills the micro gaps, and the sealing ring 16 provides low-pressure support.

[0049] After cable 4 is installed, the sealing ring 7 is pushed to slide along cable 4 away from the main body 1 of the distribution cabinet. The sliding of the sealing ring 7 compresses the sealing fluid, causing the pressure of the sealing fluid in the through hole to rise rapidly. The increased hydraulic pressure acts on the top surface of the lower pressure ring 14, generating a downward axial thrust, pushing the lower pressure ring 14 closer to the adapter ring 15. With the slight movement of the lower pressure ring 14, the annular teeth 17 on its end face gradually mesh with the annular teeth 17 on the end face of the adapter ring 15 until a tight rigid sealing contact surface is formed. At this time, most of the axial pressure from the sealing fluid is balanced by the reaction force of the rigid tooth surface, and only a small amount of pressure is transmitted to the sealing ring 16 below. At the same time, the high-pressure sealing fluid seeps into the micro-gap at the meshing of the rigid tooth surface and the tiny gap between cable 4 and the component, using the incompressibility of the liquid to form a continuous liquid sealing barrier. If the operating conditions fluctuate and cause a very small amount of leakage on the rigid tooth surface, the sealing ring 16 located in the low-pressure area will effectively intercept it, ensuring the overall sealing reliability.

[0050] Because of the engagement structure of the annular teeth 17 between the adapter ring 15 and the pressure ring 14, the main axial sealing pressure is borne by the rigid tooth surface, which significantly reduces the compressive force on the sealing ring 16 and avoids permanent deformation and accelerated aging of the sealing ring 16 due to long-term high compressive stress, thereby greatly extending the service life of the sealing device. The engagement of the rigid tooth surface forms a tortuous leakage path, which greatly increases the resistance to fluid leakage, and can achieve efficient sealing even under low contact stress, thus improving sealing reliability. Due to the introduction and pressurization of sealing fluid, the fluidity of the liquid fills the microscopic gaps that are difficult for solid seals to cover, forming an additional liquid sealing barrier, which further enhances the overall sealing performance. Due to the pressure grading mechanism, each sealing element operates under suitable working conditions, avoiding single-point overload failure and improving the stability of the system under complex working conditions.

[0051] Furthermore, the sealing cylinder includes a cylinder body 2 and a cover 3 disposed at one end of the cylinder body 2 away from the main body 1 of the distribution cabinet, and the cover 3 is threadedly connected to the cylinder body 2.

[0052] The cylinder 2 is a cylindrical or square shell structure with a certain depth. It has a through hole for the cable 4 to pass through. One end of the cylinder 2 is fixedly connected to the outer wall of the main body of the distribution cabinet and corresponds to the position of the opening 6. The other end extends away from the main body of the distribution cabinet and forms an opening. The material of the cylinder 2 can be set according to the actual situation. For example, it can be a metal material with sufficient strength and corrosion resistance, such as stainless steel or aluminum alloy, or it can be a high-strength engineering plastic.

[0053] The cover 3 is a disc-shaped or block-shaped component that matches the end opening of the cylinder 2. It has external or internal threads on its outer or inner circumferential surface. By screwing it into the internal or external threads corresponding to the end of the cylinder 2, the end opening of the cylinder 2 can be detachably closed. The center of the cover 3 usually has a through hole for the cable 4 to pass through.

[0054] During installation, after the cable 4 passes through the cylinder 2 and internal components such as the adapter ring 15 and the sealing ring 16, the cap 3 is screwed into the end of the cylinder 2. As the cap 3 is screwed in, its inner end face gradually approaches and eventually abuts or presses against the sealing ring 16 located inside the cylinder 2. This fit allows the operator to precisely adjust the axial compression of the internal components by controlling the number of rotations of the cap 3, thereby ensuring that the sealing ring 16 obtains a suitable amount of pre-compression deformation to form an effective seal, while avoiding the problem of uncontrollable compression caused by interference fit or one-time press-fit.

[0055] Because of the separate threaded connection structure of the cylinder 2 and the cover 3, the installation process of the sealing ring 16 is changed from the traditional integral press fitting to an adjustable screw-in press fitting. This allows for precise control of the pre-compression of the sealing ring 16, avoiding local sealing failure caused by uneven compression. At the same time, due to the detachable nature of the cover 3, when the sealing ring 16 needs to be replaced, it is not necessary to disassemble the entire sealing cylinder or the moving cable 4. The operation can be completed simply by unscrewing the cover 3. This significantly reduces the difficulty and cost of maintenance, and improves the maintainability and service life of the device.

[0056] In addition, the sealing ring 16 includes an integrally formed first sealing section and a second sealing section. The outer diameter of the second sealing section is larger than the outer diameter of the first sealing section to form a stepped surface. The bottom surface of the adapter ring 15 abuts against the stepped surface. The first sealing section fills the gap between the adapter ring 15 and the cable 4 and extends to the space between the pressure ring 14 and the cable 4.

[0057] The first and second sealing sections of the sealing ring 16 are integrally molded, meaning they are vulcanized or injection molded using the same mold during manufacturing, with no seams in between, thus ensuring the overall strength and sealing continuity of the structure. The outer diameter of the second sealing section is larger than that of the first sealing section. The stepped surface formed at the connection between the two can be a horizontal annular plane or a conical surface with a slight inclination, as long as it can form an effective axial support reference. This stepped surface provides a clear axial limiting reference for the adapter ring 15. When the sealing fluid generates pressure to push the lower pressure ring 14 downward, the lower pressure ring 14 drives the adapter ring 15 to be subjected to force synchronously. The bottom surface of the adapter ring 155 tightly abuts against the stepped surface, thereby preventing the adapter ring 15 from axially shifting or tilting under high pressure, ensuring that the annular teeth 17 on the adapter ring 15 and the annular teeth 17 on the lower pressure ring 14 can maintain a stable meshing state.

[0058] The first sealing section fills the gap between the adapter ring 15 and the cable 4, and extends to the space between the pressure ring 14 and the cable 4, wrapping around the outer circumference of the cable 4, located between the rigid components (adapter ring 15 and pressure ring 14) and the outer sheath of the cable 4. Specifically, the first sealing section can be implemented with its inner diameter slightly smaller than the outer diameter of the cable 4, using its own elastic deformation to tightly grip the outer wall of the cable 4; or it can be compressed to a preset height during installation, generating radial rebound force to tightly adhere to the cable 4. Through this cooperation, the first sealing section completely isolates the cable 4 from the adapter ring 15 and the pressure ring 14, preventing direct compression of the cable sheath and causing damage, thus providing insulation protection and mechanical buffering. Simultaneously, the first sealing section undergoes elastic deformation under pressure, further filling any microscopic unevenness that may exist between the adapter ring 15, the pressure ring 14, and the cable 4, intercepting any trace leakage of sealing fluid through the meshing interface of the annular teeth 17, forming an auxiliary sealing barrier.

[0059] When the sealing ring 7 slides away from the main body 1 of the distribution cabinet to pressurize the sealing fluid in the through hole, the hydraulic force is transmitted to the lower pressure ring 14, pushing the lower pressure ring 14 to move towards the adapter ring 15, so that the annular teeth 17 of the two mesh with each other. At this time, the huge axial clamping force is transmitted to the sealing ring 16 below through the adapter ring 15. Since the sealing ring 16 is provided with a second sealing section with a larger outer diameter, the bottom surface of the adapter ring 15 directly abuts against the stepped surface formed by the second sealing section. The stepped surface bears the main axial load with its large bearing area, limiting the displacement of the adapter ring 15. At the same time, the first sealing section with a smaller outer diameter is in a relatively low-pressure compression state, which is mainly responsible for filling the annular gap between the inner hole of the adapter ring 15, the inner hole of the lower pressure ring 14 and the outer wall of the cable 4. This structure allows the sealing ring 16 to no longer rely solely on the overall high compressive deformation to maintain the seal, but instead achieves force diversion through the stepped surface: the stepped surface is responsible for structural positioning and bearing the main pressure, while the first sealing section is responsible for filling micro-gaps and providing a bottom seal. This significantly reduces the compressive stress of the first sealing section and slows down its aging rate while ensuring the reliability of the seal.

[0060] Through the above technical solution, since the sealing ring 16 adopts an integrally formed first sealing section and second sealing section to form a stepped surface, the adapter ring 15 obtains a stable axial contact reference, preventing its axial movement under high pressure conditions, thereby ensuring the stability of the meshing interface of the rigid ring tooth 17; because the first sealing section extends and fills between the adapter ring 15, the lower pressure ring 14 and the cable 4, it realizes the physical isolation between the rigid component and the cable 4, which not only protects the outer sheath of the cable 4 from mechanical damage, but also uses its elastic deformation to fill the micro gaps, enhancing the local sealing effect; therefore, without adding extra parts, this structure simultaneously realizes the axial limiting of the adapter ring 15, the insulation protection of the cable 4 and the auxiliary sealing function through the optimization of the geometry of the sealing ring 16 itself, effectively solving the problems of unreliable positioning of the adapter ring 15 and single function of the sealing component in the prior art, and improving the overall sealing life and reliability of the device.

[0061] To maintain the pressure within the through hole and keep the sealing ring 7 pressed down during use, the distribution cabinet also includes a limiting mechanism 5. The limiting mechanism 5 is located inside the main body 1 of the distribution cabinet and corresponds to the position of the opening 6. The limiting mechanism 5 presses at least partially against the sealing ring 7 to prevent the sealing ring 7 from moving away from the sealing cylinder.

[0062] The limiting mechanism 5 is a mechanical component installed inside the main body 1 of the distribution cabinet, used to axially constrain the sealing ring 7. Its function is to withstand the reverse thrust generated by the pressurized sealing fluid, preventing the sealing ring 7 from undergoing unintended axial displacement under hydraulic pressure. The limiting mechanism 5 and the sealing ring 7 form a direct abutting fit. When the sealing ring 7 is subjected to pressure from the sealing fluid in the through-hole and tends to move towards the interior of the main body 1 of the distribution cabinet (i.e., away from the sealing cylinder), the limiting mechanism 5 provides a reverse supporting force, limiting this displacement tendency within an allowable range. This fit allows the static pressure of the sealing fluid to be maintained stably over a long period, thereby ensuring that the meshing surface of the annular teeth 17 between the adapter ring 15 and the lower pressure ring 14 is always in a compressed working state.

[0063] Specifically, the limiting mechanism 5 includes: a limiting post 51, which is arbitrarily connected to the main body 1 of the distribution cabinet along its own axial direction, and the top of the limiting post 51 has a radially protruding abutment portion; a limiting member 52, which is slidably sleeved on the limiting post 51, and the limiting member 52 at least partially presses on the sealing ring 7; and a spring 53, which is sleeved on the limiting post 51, with one end of the spring 53 abutting against the abutment portion and the other end of the spring 53 abutting against the limiting member 52.

[0064] The limiting post 51 is a rod-shaped or column-shaped component that is adjustable along its own axial position to the main body 1 of the distribution cabinet, and its top end is provided with a radially protruding abutment. The limiting post 51 provides an adjustable axial support reference for the limiting member 52 and limits the upper end position of the spring 53 through the abutment. The connection method between the limiting post 51 and the main body 1 of the distribution cabinet can be set according to the actual situation. For example, it can be a threaded connection, in which the depth of the limiting post 51 screwed into the main body 1 can be changed by rotating it to adjust the axial position; it can also be a snap-fit ​​connection and fixed by a set screw; or it can be a slide rail connection and fixed by a locking block. The abutment can be a flange structure integrally formed on the top end of the limiting post 51, or it can be an independent annular part fixed by interference fit or welding. Its function is to form a stable contact surface with one end of the spring 53, prevent the spring 53 from dislodging and transmit elastic force.

[0065] The limiting member 52 is a block-shaped, ring-shaped, or plate-shaped component that slides on the outer circumferential surface of the limiting post 51, and at least partially presses against the sealing ring 7. The limiting member 52 converts the elastic restoring force of the spring 53 into an axial clamping force on the sealing ring 7 and restricts the sealing ring 7 from moving away from the sealing cylinder. The limiting member 52 and the limiting post 51 have a sliding fit, meaning that the limiting member 52 can slide back and forth along the axial direction of the limiting post 51, but is constrained by the limiting post 51 in the radial direction to maintain alignment. The contact surface between the limiting member 52 and the sealing ring 7 can be a planar contact or a curved surface contact with a buffer pad to ensure uniform pressure distribution. When the sealing ring 7 undergoes slight deformation or wear due to long-term pressure, the limiting member 52 can automatically follow the displacement under the push of the spring 53, continuously maintaining the clamping state on the sealing ring 7.

[0066] One end of the spring 53 abuts against the abutting part, and the other end abuts against the limiting member 52. The spring 53 can provide a continuous and buffered preload to balance the reverse thrust generated after the sealing fluid is pressurized and to compensate for the positional change of the sealing ring 7. The specific form of the spring 53 can be set according to the actual situation. For example, it can be a helical compression spring 53, a disc spring 53 assembly, or a rubber elastomer. The spring 53, through its cooperation with the abutting part and the limiting member 52, forms a force transmission chain of limiting post 51-spring 53-limiting member 52-sealing ring 7: when the axial position of the limiting post 51 is adjusted, the abutting part moves accordingly, changing the compression of the spring 53, thereby adjusting the magnitude of the preload applied to the limiting member 52 and the sealing ring 7; when the sealing ring 7 is subjected to pressure impact from the sealing fluid and undergoes slight displacement, the spring 53 undergoes elastic deformation to absorb energy, avoiding rigid impact that could lead to seal failure.

[0067] Through the above technical solution, the constraint method of the sealing ring 7 is upgraded from the single fixed compression in the existing technology to an adjustable elastic compression. Since the axial position of the limiting post 51 is adjustable, the initial compression of the spring 53 can be precisely set, thereby realizing flexible control of the pre-tightening force of the sealing ring 7 and avoiding the problem of damage to the sealing ring 7 due to excessive pre-tightening force or dislodgement due to insufficient pre-tightening force. Due to the introduction of the spring 53 and the sliding cooperation of the limiting component 52, when the sealing ring 7 is worn or deformed, the spring 53 can automatically release the stored elastic potential energy to push the limiting component 52 to follow up and compensate, ensuring a continuous and stable clamping force output, and solving the problem of frequent shutdown maintenance due to seal failure caused by component wear. Since an elastic buffer system of limiting post 51-spring 53-limiting component 52 is formed, it can effectively absorb the impact load caused by the pressure fluctuation of the sealing fluid, improving the stability and reliability of the entire sealing device under dynamic working conditions.

[0068] Based on any of the above embodiments, a fixing ring 12 is also sleeved on the cable 4, and the top of the pressure ring 14 abuts against the bottom surface of the fixing ring 12.

[0069] The retaining ring 12 is an annular limiting component fitted onto the outer circumference of the cable 4. Its material can be metal, rigid plastic, or other materials with sufficient rigidity and strength. The inner circumferential surface of the retaining ring 12 is tightly fitted to the outer wall of the cable 4 or fixed by interference fit, bonding, or other methods, thereby forming an axial stop reference fixed relative to the cable 4. The retaining ring 12 provides reliable mechanical limiting for the lower pressure ring 14, preventing unintended displacement of the lower pressure ring 14 in the axial direction. Specifically, the retaining ring 12 is located on the side of the lower pressure ring 14 away from the adapter ring 15 (i.e., above), and its bottom surface directly abuts against the top surface of the lower pressure ring 14. When the sealing fluid pressurizes the inside of the through hole, or when external vibration or impact causes the lower pressure ring 14 to experience an upward axial thrust, this thrust is directly transmitted to the retaining ring 12, which bears and offsets it, thereby preventing the lower pressure ring 14 from moving upward. This mating relationship ensures that the annular teeth 17 at the bottom of the pressure ring 14 can always maintain a tight meshing with the annular teeth 17 on the adapter ring 15, avoiding the risk of separation of the rigid sealing surface or sealing failure due to loosening of the pressure ring 14.

[0070] Because a fixed ring 12 is set up and used as the axial limiting reference for the lower pressure ring 14, the technical problem that the lower pressure ring 14 is prone to axial loosening under high pressure or vibration environment when it is positioned by friction with the cable 4 alone is solved, which leads to the failure of the ring tooth 17 to mesh. Thus, the positioning method of the lower pressure ring 14 is upgraded from unreliable friction self-locking to reliable mechanical limiting, which significantly improves the stability and reliability of the rigid sealing surface in long-term operation.

[0071] Furthermore, the fixed ring 12 is provided with a liquid passage 13 that connects the upper and lower spaces of the fixed ring 12.

[0072] The liquid passage 13 is a through hole, groove, or channel structure formed on the body of the fixing ring 12, used to connect the upper and lower spaces of the fixing ring 12. The shape of the liquid passage 13 can be set according to the actual situation, such as a circular hole, a long groove, a rectangular hole, or an irregularly shaped opening. The number of liquid passages 13 can also be set according to the actual flow requirements of the sealing fluid, for example, there can be one, or multiple evenly distributed along the circumference of the fixing ring 12, to ensure that the sealing fluid can flow quickly and evenly on both sides of the fixing ring 12. In this application, the liquid passage 13 is used to establish a fluid communication path between the two areas separated by the fixing ring 12, so that the sealing fluid can freely pass through the fixing ring 12, thereby eliminating the dead zones or pressure isolation zones that may be formed due to the blockage of the solid structure of the fixing ring 12. The liquid inlet 13 forms a mating relationship with the fixed ring 12 and the cable 4. The sealing fluid flows from the upper part of the fixed ring 12 through the liquid inlet 13 to the area where it meshes with the lower pressure ring 14 and the adapter ring 15, or flows in the opposite direction when the pressure changes. Through this fluid communication, the pressure balance and liquid level replenishment of the sealing fluid in the entire sealing cavity are achieved.

[0073] Because a liquid passage 13 is provided on the fixed ring 12 to connect the upper and lower spaces, the sealing fluid can flow freely on both sides of the fixed ring 12. This solves the problem of insufficient fluid in the meshing area between the lower pressure ring 14 and the adapter ring 15 caused by the fixed ring 12 blocking the fluid path, and ensures that the rigid sealing surface is fully wetted by the sealing fluid. At the same time, because the liquid passage 13 provides a pressure balance channel, the sealing fluid can automatically adjust its distribution when it expands and contracts with heat. This achieves the technical effect of preventing local high pressure or negative pressure from impacting the sealing structure and improving the system's adaptability to environmental changes.

[0074] Based on any of the above embodiments, the sealing cylinder has a liquid storage chamber 8 inside its wall, and the liquid storage chamber 8 is connected to the through hole through multiple communication ports.

[0075] The liquid storage chamber 8 refers to the hollow accommodating space located inside the sealing cylinder 2. Its shape can be set according to actual conditions; for example, it can be an annular chamber extending circumferentially along the cylinder 2, or it can be an independent sac-like chamber distributed on the side wall of the cylinder 2. The liquid storage chamber 8 serves as a buffer and compensation container for the sealing fluid, used to contain the sealing fluid whose volume changes due to changes in ambient temperature or pressure fluctuations. The liquid storage chamber 8 and the sealing fluid space within the through-hole form a communicating vessel structure through multiple connecting ports, allowing the sealing fluid to flow freely between the through-hole and the liquid storage chamber 8. When the sealing fluid in the through hole expands in volume due to increased temperature, the excess sealing fluid flows into the storage chamber 8 through the connecting port for temporary storage. The extra volume of the storage chamber 8 absorbs the volume increase, thereby smoothing out the pressure peak in the through hole and preventing abnormal high pressure from causing overload impact on the meshing surfaces of the sealing ring 7, sealing ring 16, and ring tooth 17. Conversely, when the sealing fluid shrinks in volume due to decreased temperature or the fluid volume decreases due to minor leakage, the spare sealing fluid in the storage chamber 8 can flow back into the through hole through the connecting port to maintain the working fluid level and pressure stability of the sealing fluid.

[0076] Multiple connecting ports are fluid channels that penetrate the wall of the sealed cylinder and connect the liquid storage chamber 8 to the through hole. The number, diameter, and distribution of the connecting ports can be set according to actual conditions. For example, they can be several circular holes evenly distributed along the length of the cable 4, or they can be slit-like openings. The design of multiple connecting ports ensures the redundancy of the liquid path between the liquid storage chamber 8 and the through hole. Even if some connecting ports are blocked by impurities, the remaining connecting ports can still maintain unobstructed liquid path, ensuring the reliability of pressure balance and liquid volume compensation functions. In operation, the connecting ports act as gateways for the sealing fluid to enter and exit the liquid storage chamber 8, realizing dynamic pressure balance between the main sealing area in the through hole and the buffer area of ​​the liquid storage chamber 8.

[0077] Because a liquid storage chamber 8 is set inside the sealing cylinder wall and connected to the through hole through multiple connecting ports, the sealing fluid has a buffer space for volume changes. Therefore, it effectively absorbs the pressure fluctuations caused by the expansion or contraction of the sealing fluid volume due to temperature changes, preventing abnormal high pressure from damaging the seal or sealing failure due to lack of fluid. At the same time, due to the design of multiple connecting ports, redundant liquid channels are formed. Therefore, even if some connecting ports are blocked, the remaining connecting ports can still maintain the smooth flow of liquid, improving the fault tolerance and long-term operational reliability of the system.

[0078] Furthermore, an airbag 9 is also provided inside the liquid storage chamber 8. The airbag 9 is an elastic, sealed bladder inside the liquid storage chamber 8, which encapsulates compressible gas. The airbag 9 can be made of rubber, silicone, or other polymer materials with high elasticity and airtightness. Its shape can be adapted to the internal spatial structure of the liquid storage chamber 8, for example, it can be spherical, ellipsoidal, or irregularly shaped. As a pressure buffer and volume compensation element, the airbag 9 forms a linkage with the sealing fluid in the liquid storage chamber 8 and the through hole: when the sealing fluid in the through hole expands in volume due to temperature increase or the pressure increases instantaneously due to external impact, the excess sealing fluid enters the liquid storage chamber 8 through the connecting port and squeezes the airbag 9, compressing the gas inside the airbag 9 and converting the increase in liquid volume into the pressure energy of the gas for storage; conversely, when the sealing fluid contracts in volume due to temperature decrease or a small amount of leakage occurs, causing the liquid level to drop, the compressed gas inside the airbag 9 expands, pushing the sealing fluid in the liquid storage chamber 8 back into the through hole through the connecting port. Through the above combination, the airbag 9 utilizes the high compressibility of gas to significantly increase the effective buffer volume of the liquid storage chamber 8, suppress pressure spikes in the system, and maintain the dynamic stability of the working pressure of the sealing fluid. At the same time, it achieves physical isolation between gas and liquid, preventing air bubbles from mixing into the main sealing area.

[0079] Specifically, during the operation of the distribution cabinet, if changes in ambient temperature or displacement of cable 4 cause fluctuations in the volume of the sealing fluid in the through-hole, the sealing fluid will exchange fluid with the storage chamber 8 through the connecting port. When the sealing fluid rushes into the storage chamber 8, it directly contacts and presses the outer surface of the airbag 9, causing the airbag 9 to elastically deform and contract, increasing the internal air pressure to balance the liquid pressure, thereby absorbing the volume expansion of the liquid and preventing excessive pressure in the through-hole from impacting the sealing ring 7 or sealing ring 16. When liquid needs to be replenished, the airbag 9 expands by its own restoring force, pushing the stored sealing fluid back into the through-hole to fill the space gap caused by cold contraction or leakage. During this process, the airbag 9 always exists as an independent flexible medium in the storage chamber 8, ensuring that only liquid and no free gas enter the storage chamber 8, thus ensuring the continuity of the liquid barrier in the main sealing area.

[0080] Because an air bladder 9 is installed in the liquid storage chamber 8, the high compressibility of the gas absorbs the volume change of the sealing liquid caused by thermal expansion and contraction, thereby avoiding the sudden rise or fall of pressure that may be caused by the rigid liquid storage space. This solves the problem that the liquid storage chamber 8 has limited buffering capacity and is difficult to cope with instantaneous pressure shocks. It achieves the technical effects of smoothing system pressure fluctuations, maintaining long-term stability of sealing liquid pressure, and preventing gas from mixing into the sealing liquid and damaging the continuity of the liquid barrier.

[0081] In addition, the multiple connecting ports are divided into at least an upper connecting port 10 and a lower connecting port 11 along the length of the cable 4.

[0082] By arranging multiple connecting ports in layers along the length of the cable 4, that is, at least distinguishing between the upper connecting port 10 at a higher position and the lower connecting port 11 at a lower position, a fluid exchange channel with a height difference is formed between the liquid storage chamber 8 and the through hole, and the fluid entry and exit path is optimized by utilizing the principle of gravity and liquid level difference.

[0083] The upper connecting port 10 refers to the connecting channel located at a relatively high position along the length of the cable 4. Its specific location can be set according to the height of the liquid storage chamber 8 and the required gas-liquid separation effect. For example, it can be located near the top of the liquid storage chamber 8 or at other positions on the upper side wall of the liquid storage chamber 8. In the cooperation between the upper connecting port 10 and the lower connecting port 11, the upper connecting port 10 mainly undertakes the function of gas discharge or pressure balancing. When the system is in the initial liquid injection stage or the liquid level rising stage, the upper connecting port 10 acts as an exhaust channel, allowing air in the liquid storage chamber 8 to be discharged to the through hole to prevent air blockage. When the system is in a stable working state, the upper connecting port 10 maintains pressure communication with the space above the liquid surface in the through hole or the high-pressure zone, ensuring that the air pressure at the top of the liquid storage chamber 8 is synchronized with the sealing fluid pressure in the through hole, avoiding fluid flow obstruction due to pressure difference.

[0084] The lower connecting port 11 refers to the connecting channel located at a relatively low position along the length of the cable 4. Its specific location can be set according to the bottom structure of the liquid storage chamber 8 and the liquid return requirements. For example, it can be located near the bottom of the liquid storage chamber 8 or at other positions on the lower side wall of the liquid storage chamber 8. In the cooperation between the lower connecting port 11 and the upper connecting port 10, the lower connecting port 11 mainly undertakes the function of liquid inflow and outflow. When the volume of the sealing liquid in the through hole expands, the excess liquid enters the liquid storage chamber 8 through the lower connecting port 11 for temporary storage; when the volume of the sealing liquid contracts and needs to be replenished, the spare liquid in the liquid storage chamber 8 flows back to the through hole through the lower connecting port 11. This high-low layered arrangement allows the liquid to form a natural convection path when entering and exiting the liquid storage chamber 8, that is, the liquid enters and exits from the bottom, and the gas balances from the top, thereby improving the smoothness of liquid circulation.

[0085] During the initial installation and liquid injection process of the sealing device for cable 4 in the distribution cabinet, the sealing liquid is gradually injected from the bottom of the through hole and rises. At this time, the liquid level first reaches the height of the lower connecting port 11, and the liquid begins to enter the lower part of the liquid storage chamber 8 through the lower connecting port 11. As the liquid level continues to rise, the air in the liquid storage chamber 8 is compressed and gathers upward, and finally is smoothly discharged into the through hole through the higher upper connecting port 10. This process effectively avoids the formation of an airlock due to improper position of a single connecting port, thus ensuring that the liquid storage chamber 8 can be fully filled with sealing liquid and maximizing its effective liquid storage volume. During subsequent operation of the device, when the ambient temperature rises and causes the sealing liquid in the through-hole to expand, the expanding liquid pushes the liquid column at the lower connecting port 11 into the liquid storage chamber 8. At the same time, the air at the top of the liquid storage chamber 8 maintains pressure balance through the upper connecting port 10. Conversely, when the temperature drops and causes the liquid to contract, the liquid in the liquid storage chamber 8 quickly flows back to the through-hole through the lower connecting port 11 under the action of gravity and pressure difference, while the upper connecting port 10 immediately introduces air pressure balance to prevent negative pressure suction. Through the layered arrangement of the upper and lower connecting ports 11, a highly efficient liquid-gas separation and convection channel is constructed between the liquid storage chamber 8 and the through-hole, significantly improving the system's response speed to temperature changes and pressure equalization efficiency.

[0086] Through the above technical solution, this application achieves the beneficial effects of layering multiple connecting ports along the length of cable 4: By setting up upper connecting ports 10 and lower connecting ports 11 at different heights, a clear liquid inlet / outlet channel and gas balance channel are formed, solving the problems in the prior art where a single connecting port easily leads to poor venting of the liquid storage chamber 8, forming airlocks, and obstruction of the liquid replenishment and drainage process; because the lower connecting port 11 is dedicated to liquid exchange and is located at a low position, it utilizes gravitational potential energy to promote the natural backflow and discharge of liquid, while the upper connecting port 10 is dedicated to gas discharge and pressure balance and is located at a high position, avoiding liquid blockage of the venting path, thus achieving the technical effect of ensuring that the liquid storage chamber 8 is fully filled with liquid and avoiding effective volume loss; furthermore, because the high and low connecting ports constitute a convection circulation path, the volume compensation response speed of the sealing liquid during temperature changes is accelerated, allowing the internal pressure of the system to quickly reach a balanced state, thereby improving the dynamic performance and long-term operational reliability of the entire cable 4 sealing device under complex temperature environments.

[0087] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A distribution cabinet with a cable sealing device, comprising a cabinet body, wherein an opening for a cable to pass through is provided at the bottom of the cabinet body, a sealing cylinder is fixed on the outer side of the cabinet body corresponding to the opening, and a through hole for the cable to pass through is provided inside the sealing cylinder, the through hole being aligned with the opening; characterized in that, Also includes: An adapter ring is provided on the inner wall of the through hole. The outer circumferential surface of the adapter ring is sealed to the inner wall of the through hole. The end face of the adapter ring facing the main body of the power distribution cabinet is provided with annular teeth. A pressure ring is sleeved on the cable and located on the side of the adapter ring facing the main body of the distribution cabinet. The inner circumferential surface of the pressure ring is sealed to the outer wall of the cable. The end face of the pressure ring facing the adapter ring is provided with annular teeth that mesh with the annular teeth on the adapter ring to form a seal. A sealing ring is filled in the through hole between the end face of the adapter ring away from the main body of the distribution cabinet and the bottom of the sealing cylinder, and seals the gap between the inner wall of the through hole and the outer wall of the cable. A sealing ring is slidably fitted onto the cable and at least partially located within the opening. The sealing ring is in sealing contact with the inner wall of the opening and the outer wall of the cable. The through hole between the adapter ring and the sealing ring is filled with sealing fluid. The sealing ring can slide along the cable in a direction away from the main body of the distribution cabinet to pressurize the sealing fluid in the through hole.

2. A distribution cabinet with a cable sealing device according to claim 1, characterized in that, The sealing cylinder includes a cylinder body and a cover disposed at one end of the cylinder body away from the main body of the distribution cabinet, and the cover is threadedly connected to the cylinder body.

3. A distribution cabinet with a cable sealing device according to claim 1, characterized in that, The sealing ring includes an integrally formed first sealing section and a second sealing section. The outer diameter of the second sealing section is larger than the outer diameter of the first sealing section to form a stepped surface. The bottom surface of the adapter ring abuts against the stepped surface. The first sealing section fills the gap between the adapter ring and the cable and extends to the space between the pressure ring and the cable.

4. A distribution cabinet with a cable sealing device according to claim 1, characterized in that, It also includes a limiting mechanism, which is located inside the main body of the distribution cabinet and corresponds to the opening position. The limiting mechanism presses at least partially on the sealing ring to prevent the sealing ring from moving away from the sealing cylinder.

5. A distribution cabinet with a cable sealing device according to claim 4, characterized in that, The limiting mechanism includes: A limiting post is adjustablely connected to the main body of the distribution cabinet along its own axial direction, and the top of the limiting post has a radially protruding abutment part. The limiting component is slidably sleeved on the limiting post, and the limiting component presses at least partially on the sealing ring; A spring is sleeved on the limiting post, with one end of the spring abutting against the abutting part and the other end of the spring abutting against the limiting member.

6. A distribution cabinet with a cable sealing device according to claim 1, characterized in that, A retaining ring is also fitted onto the cable, and the top of the pressure ring abuts against the bottom surface of the retaining ring.

7. A distribution cabinet with a cable sealing device according to claim 6, characterized in that, The fixed ring has a liquid passage opening that connects the upper and lower spaces of the fixed ring.

8. A distribution cabinet with a cable sealing device according to claim 1, characterized in that, The sealed cylinder has a liquid storage chamber inside its wall, and the liquid storage chamber is connected to the through hole through multiple communication ports.

9. A distribution cabinet with a cable sealing device according to claim 8, characterized in that, An airbag is also provided inside the liquid storage chamber.

10. A distribution cabinet with a cable sealing device according to claim 8, characterized in that, The multiple connection ports are divided into at least upper connection ports and lower connection ports along the length of the cable.

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