Moistureproof corrosion-resistant shielding layer insulation tubular bus for underground rail transit tunnel

Abstract

The invention relates to the technical field of cable manufacturing, discloses a moisture-proof and corrosion-resistant shielding layer insulation tubular bus for an underground rail transit tunnel, and aims to solve the problems of uneven thickness of an insulation layer and a semi-conductive layer and electric field distortion caused by self-weight sagging and train vibration of an existing bus. The bus is composed of a conductor tube, an inner semi-conductive layer, an insulating layer, an outer semi-conductive layer, a corrosion-resistant shielding layer, a voltage-sharing assembly and a sliding adjustment assembly, the sliding adjustment assembly adopts a bottom splayed pushing block and a top overlapping block to cooperate with a circumferential gradual-change depth guide groove, and the vertical extrusion force of the lower part of the bus can be converted into full-circumferential inward pressure. According to the invention, insulation concentricity and electric field uniformity can be effectively maintained, partial discharge and interlayer debonding are inhibited, the vibration resistance and insulation reliability of the bus are improved, the service life is prolonged, and the bus is adaptive to long-term complex operation conditions of rail transit tunnels.

Description

Technical Field

[0001] This invention relates to the field of cable manufacturing technology, and in particular to a moisture-proof and corrosion-resistant shielded insulated tubular busbar for underground rail transit tunnels. Background Technology

[0002] Tubular busbars are rigid, high-capacity power transmission components consisting of a hollow metal conductive tube as the core conductor, successively covered with an insulation layer, a semi-conductive shielding layer, and an outer protective sleeve. They are mainly used for the main power transmission and distribution in high-voltage power transmission and distribution systems. They have advantages such as large current carrying capacity, high heat dissipation efficiency, good mechanical strength, uniform electric field distribution, and strong installation adaptability. They are widely used in rail transit, substations, power plants, and intelligent power distribution systems, and are key power distribution equipment to ensure stable power transmission.

[0003] Tubular busbars in rail transit tunnels are mostly installed using span installation. Under long-term self-weight, the busbar mid-span area will undergo natural sagging deformation, causing the lower semiconductive layer and insulation layer to be continuously subjected to radial compression. This easily leads to uneven distribution of the thickness of the semiconductive and insulation layers on the upper and lower sides of the busbar. Uneven thickness of the semiconductive layer directly reduces its electric field uniformity control effect, while uneven thickness of the insulation layer will disrupt its concentricity with the internal metal conductive tube, easily affecting the electrical performance of the busbar. At the same time, the continuous vibration from train operation will further intensify the alternating stress between the layers, causing the interfacial bonding force between the semiconductive and insulation layers to gradually weaken. This easily leads to local interlayer gaps or even interfacial debonding defects, thereby deteriorating the uniformity of the electric field inside the busbar and reducing the insulation reliability and long-term service life of the busbar. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that, under the combined effects of long-term self-weight sagging and continuous train vibration, the tubular busbars installed in the span of existing rail transit tunnels are prone to problems such as uneven thickness of insulation and semi-conductive layers, weakening of interlayer bonding force, and even gap debonding. This affects the uniformity and concentricity of the electric field, and reduces the electrical performance, insulation reliability and service life of the busbar. To address this, we propose a moisture-proof and corrosion-resistant shielded insulating tubular busbar for underground rail transit tunnels.

[0005] To achieve the above objectives, this application adopts the following technical solution: a moisture-proof and corrosion-resistant shielded insulated tubular busbar for underground rail transit tunnels, comprising: a conductor tube, the conductor tube being coaxially wrapped with an inner semiconductive layer, the inner semiconductive layer being coaxially wrapped with an insulating layer, the insulating layer being coaxially wrapped with an outer semiconductive layer, the outer semiconductive layer being wrapped with a corrosion-resistant shielding layer, a voltage equalization component being disposed outside the corrosion-resistant shielding layer, and a sliding adjustment component being disposed outside the voltage equalization component;

[0006] The sliding adjustment component includes a first sliding block and a second sliding block. The first sliding block and the second sliding block are respectively attached to the left and right sides of the pressure equalization component, and the first sliding block and the second sliding block form an annular sleeve. The bottom end of the first sliding block is integrally provided with a first pushing block, and the bottom end of the second sliding block is integrally provided with a second pushing block. The first pushing block and the second pushing block together form an upward-opening figure-eight structure. The top end of the first sliding block is integrally connected with a first overlapping block, and the top end of the second sliding block is integrally connected with a second overlapping block. The first overlapping block overlaps on top of the second overlapping block, and the first overlapping block and the second overlapping block are slidably connected.

[0007] When the gravity of the conductor tube and the inner semiconductive layer acts on the inner wall of the sliding adjustment component, the downward gravity drives the pressure equalization component to push the first and second push blocks downward. Under the action of the upward-opening figure-eight structure, the downward force is transformed into the force of the first and second sliding blocks sliding along the circumference, thereby increasing the overlapping part between the first and second overlapping blocks.

[0008] Preferably, the sliding adjustment component is wrapped with an outer sheath, and the inner wall of the outer sheath is provided with a plurality of guide grooves at equal intervals, the depth of the guide grooves gradually decreasing from bottom to top.

[0009] Preferably, a third slider is fixedly connected to the outer wall of both the first sliding block and the second sliding block, and the third slider is slidably connected inside the guide groove.

[0010] Preferably, the pressure equalization component includes a lower support block and an upper support block, which are symmetrically arranged at the bottom and top of the corrosion-resistant shielding layer, respectively.

[0011] Preferably, a flexible buffer strip is provided between the lower support block and the upper support block, with the top of the flexible buffer strip fixedly connected to the upper support block and the bottom of the flexible buffer strip fixedly connected to the lower support block.

[0012] Preferably, two sets of flexible buffer strips are symmetrically arranged about the vertical central axis of the lower support block, and the lower support block, the upper support block, and the two sets of flexible buffer strips together form a ring-shaped sleeve.

[0013] Preferably, a first slider is fixedly connected to the outer wall of the lower support block, and a second slider is fixedly connected to the outer wall of the upper support block. Limiting grooves are formed on the inner walls of both the first and second sliding blocks, and the first and second sliders are slidably connected inside the limiting grooves.

[0014] Preferably, a plurality of mounting clamps are installed at equal intervals on the outside of the outer sheath. The mounting clamps are used to install and fix the outer sheath, and ensure that after installation, the first stacked block and the second stacked block are located above the pressure equalization component, and the first pushing block and the second pushing block are located below the pressure equalization component.

[0015] Preferably, the mounting fixture includes a mounting block, a first fixing block is fixedly connected to the top of the mounting block, a second fixing block is provided on the top of the first fixing block, the first fixing block and the second fixing block are engaged together on the outside of the outer sheath, and fixing bolts are installed at both ends of the first fixing block, and the fixing bolts are used to fix the first fixing block and the second fixing block.

[0016] Preferably, the inner walls of both the first fixing block and the second fixing block are fixedly connected with protective pads, and the protective pads are attached to the outer wall of the outer sheath.

[0017] The technical effects and advantages of this invention are as follows:

[0018] This invention, through the coordinated design of a sliding adjustment component with a figure-eight guide structure, a pressure equalization component, and a guide groove with gradually changing depth from bottom to top, placed between the inner core structure of the busbar and the installation fixture, combined with an installation fixture that can accurately position the installation orientation, forms a busbar deformation adaptive control scheme adapted to the harsh working conditions of rail transit. By transforming the vertical self-weight compressive force originally concentrated on the lower side of the busbar into an inward compressive stress evenly distributed along the entire circumference of the busbar, it significantly reduces the concentrated compression deformation and long-term viscoelastic creep risk of the inner semiconductive layer, insulation layer, and outer semiconductive layer on the lower side of the busbar, fundamentally avoiding the problem of uneven circumferential thickness. Furthermore, through the cooperation of the gradually changing groove depth guide structure on both sides and the top superimposed thickening structure during the sliding process, it simultaneously increases the inward compressive force on both sides and the top of the busbar, achieving uniform compression deformation of the insulation layer throughout the entire circumference, effectively maintaining the insulation layer and the internal conductor The concentricity of the tube ensures uniform electric field control of the inner semiconducting layer, suppressing electric field distortion and partial discharge risks caused by uneven thickness and concentricity deviation. At the same time, the sliding adjustment component after sliding into place can form a stable circumferential arched clamping support structure together with the voltage equalization component. Even in a static limit state, it can continuously disperse the concentrated load on the lower side. It can also offset the alternating vibration impact brought by train operation through the uniform compressive stress distribution in the whole circumference, avoiding interface debonding and gap defects caused by the attenuation of interlayer bonding force. It significantly improves the vibration resistance, electrical insulation reliability and structural stability of the busbar, delays the electrical aging, thermal aging and mechanical fatigue process of polymer insulation materials, greatly extends the long-term service life of tubular busbars in closed tunnels of rail transit, reduces operation and maintenance costs and power failure risks, and perfectly adapts to the complex and harsh long-term operating conditions of underground rail transit tunnels. Attached Figure Description

[0019] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0020] Figure 1 This is a three-dimensional structural diagram of the entire invention;

[0021] Figure 2 This is a schematic cross-sectional view of the main body of the tubular busbar of the present invention;

[0022] Figure 3 This is a three-dimensional structural diagram of the internal part of the corrosion-resistant shielding layer of the present invention;

[0023] Figure 4 This is a three-dimensional structural diagram of the voltage equalization component of the present invention;

[0024] Figure 5 This is a three-dimensional structural diagram of the sliding adjustment component of the present invention;

[0025] Figure 6 This is a schematic cross-sectional view of the sliding adjustment component of the present invention;

[0026] Figure 7 This is a three-dimensional structural diagram of the outer sheath portion of the present invention;

[0027] Figure 8 This is a three-dimensional structural diagram of the mounting fixture part of the present invention.

[0028] Legend: 1. Conductor tube; 2. Inner semiconductive layer; 3. Insulating layer; 4. Outer semiconductive layer; 5. Corrosion-resistant shielding layer; 6. Voltage equalization assembly; 7. Sliding adjustment assembly; 8. Outer sheath; 9. Mounting fixture; 10. Guide groove; 601. Lower support block; 602. Upper support block; 603. Flexible buffer strip; 604. First slider; 605. Second slider; 701. First sliding block; 702. Second sliding block; 703. First overlapping block; 704. Second overlapping block; 705. First pushing block; 706. Second pushing block; 707. Third slider; 708. Limiting groove; 901. Mounting block; 902. First fixing block; 903. Second fixing block; 904. Protective pad; 905. Fixing bolt. Detailed Implementation

[0029] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0030] Reference Figure 1 , Figure 2 and Figure 3As shown, the present invention provides a technical solution: a moisture-proof and corrosion-resistant shielded insulating tubular busbar for underground rail transit tunnels, comprising: a conductor tube 1, an inner semiconductive layer 2 coaxially wrapped around the outside of the conductor tube 1, an insulating layer 3 coaxially wrapped around the outside of the inner semiconductive layer 2, an outer semiconductive layer 4 coaxially wrapped around the outside of the insulating layer 3, and a corrosion-resistant shielding layer 5 wrapped around the outside of the outer semiconductive layer 4.

[0031] In rail transit tunnels, tubular busbars are generally installed using span-based hoisting. Adjacent installation clamps 9 provide rigid constraints at both ends of the busbar. Conductor pipe 1 is generally a high-density hollow copper or aluminum pipe, and its self-weight usually accounts for more than 80% of the overall self-weight of the busbar. Under horizontal laying conditions, the vertical self-weight of conductor pipe 1 will continuously generate constant radial compressive stress on the lower inner semiconductive layer 2, insulation layer 3, and outer semiconductive layer 4 that wrap around it. The sagging in the mid-span area will further amplify this radial compression effect, causing the lower inner semiconductive layer 2, insulation layer 3, and outer semiconductive layer 4 to be under concentrated pressure for a long time. Since the elastic modulus of the inner semiconductive layer 2, insulation layer 3, and outer semiconductive layer 4 is much lower than that of metallic conductors, they will undergo continuous viscoelastic creep under long-term constant compressive stress. This leads to a gradual thinning of the thickness of the lower layer under long-term pressure, while the thickness of the upper layer, which is almost unaffected by vertical compression, remains stable. Ultimately, this results in an uneven distribution of the thickness of the inner semiconductive layer 2, insulation layer 3, and outer semiconductive layer 4 on the upper and lower sides of the busbar.

[0032] For tubular busbars laid across spans in rail transit tunnels, uneven thickness of the inner semiconductive layer 2, insulation layer 3, and outer semiconductive layer 4 can have a cascading adverse effect on electrical performance, insulation reliability, structural stability, and long-term service life. Among these, the inner semiconductive layer 2, as the core structure for homogenizing the internal electric field and suppressing partial discharge, directly disrupts the uniform distribution of the internal electric field due to uneven thickness. Localized field strength concentrations occur in areas of abrupt or excessively thin thickness, easily triggering partial discharge. Continuous discharge gradually erodes the interlayer interface, accelerating the electrical and thermal aging of the polymer material. The uneven thickness of the insulation layer 3, as the core barrier for the electrical insulation of the busbar, will disrupt the concentricity between the insulation layer 3 and the internal conductor tube 1, further aggravating the distortion of the internal electric field. Under the long-term effects of its own weight and the alternating vibration loads brought about by train operation, the defects of uneven thickness are easily amplified, accelerating the debonding of the interlayer interface, and ultimately significantly reducing the insulation reliability and long-term service life of the busbar, posing a serious safety hazard to the stable power supply in the closed tunnel of rail transit. In order to solve this technical problem, this application makes the following improvements:

[0033] Please see Figure 2 , Figure 5 and Figure 6As shown, a pressure equalization component 6 is provided outside the corrosion-resistant shielding layer 5, and a sliding adjustment component 7 is provided outside the pressure equalization component 6. The sliding adjustment component 7 includes a first sliding block 701 and a second sliding block 702. The first sliding block 701 and the second sliding block 702 are respectively attached to the left and right sides of the pressure equalization component 6, and the first sliding block 701 and the second sliding block 702 form an annular sleeve. A first pushing block 705 is integrally provided at the bottom end of the first sliding block 701, and a second pushing block 706 is integrally provided at the bottom end of the second sliding block 702. A push block 705 and a second push block 706 together form an upward-opening figure-eight structure. The top of the first sliding block 701 is integrally connected to the first overlapping block 703, and the top of the second sliding block 702 is integrally connected to the second overlapping block 704. The first overlapping block 703 overlaps on top of the second overlapping block 704, and the first overlapping block 703 and the second overlapping block 704 are slidably connected. The outer walls of the first sliding block 701 and the second sliding block 702 are both fixedly connected to the third slider 707, which is slidably connected inside the guide groove 10.

[0034] Please see Figure 6 and Figure 7 As shown, when the gravity of the conductor tube 1 and the inner semiconductive layer 2 acts on the inner wall of the sliding adjustment assembly 7, the downward gravity drives the pressure equalization assembly 6 to push the first pushing block 705 and the second pushing block 706 downward. Under the action of the upward-opening V-shaped structure, the downward force is transformed into the force of the first sliding block 701 and the second sliding block 702 sliding circumferentially, thereby reducing the compressive force acting on the lower side of the insulating layer 3, reducing the compression deformation at the bottom of the insulating layer 3, and simultaneously increasing the pressure of the first stacking block 703 and the second sliding block 702. The overlapping portion between the second overlapping blocks 704 utilizes the first overlapping block 703 and the second overlapping block 704 to increase the squeezing force generated on the pressure equalization component 6 from the top. The sliding adjustment component 7 is wrapped with an outer sheath 8. The inner wall of the outer sheath 8 is provided with several guide grooves 10 at equal intervals. The depth of the guide grooves 10 gradually decreases from bottom to top, so that the first sliding block 701 and the second sliding block 702 can also gradually increase the inward squeezing force generated on the pressure equalization component 6 from both sides during the sliding adjustment process.

[0035] By adjusting the sliding component 7 and the pressure equalization component 6, the compressive force generated by the weight of part of the inner core structure on the lower side of the insulation layer 3 is converted into an inward compressive force on the inner core structure from both sides and the top, so that the insulation layer 3 is subjected to force in the entire circumference, thereby reducing the deformation of the lower side of the insulation layer 3, while increasing the deformation of both sides and the top of the insulation layer 3, which is used to uniformly compress the insulation layer 3 in the entire circumference.

[0036] This technique, which uses the sliding adjustment component 7 to redistribute the self-weight load circumferentially, transforms the vertical self-weight compressive stress, which was originally concentrated on the lower part of the busbar and prone to causing long-term excessive compression creep of the inner semiconductive layer 2, insulating layer 3, and outer semiconductive layer 4, into an inward compressive stress evenly distributed along the entire circumference of the busbar. This significantly reduces the concentrated compression deformation on the lower side of the busbar, fundamentally avoiding the problems of thickness thinning and circumferential thickness unevenness caused by continuous pressure on the lower layers. Furthermore, by increasing the inward compression at the top and sides, it evens out the circumferential compressive stress, thereby uniformly distributing the compression deformation of the inner semiconductive layer 2, insulating layer 3, and outer semiconductive layer 4 in the circumferential direction, effectively maintaining the... The concentricity of the insulation layer 3 and the conductor tube 1 ensures the uniform control of the electric field of the inner semiconducting layer 2, suppressing the risk of electric field distortion and partial discharge caused by uneven thickness and concentricity deviation. At the same time, the uniform compressive deformation and compressive stress distribution in the entire circumference can significantly offset the impact of alternating vibration caused by train operation on the interlayer interface, avoid interface debonding and gap defects caused by the attenuation of interlayer bonding force, significantly improve the vibration resistance and insulation reliability of the busbar, delay the electrical aging, thermal aging and mechanical fatigue process of polymer insulation materials, greatly extend the long-term service life of the tubular busbar in the closed tunnel of rail transit, and reduce operation and maintenance costs and power failure risks.

[0037] Please see Figure 4 As shown, the equalizing component 6 is used to uniformly adjust the sliding adjustment component 7 by compressing its inner semiconductive layer 2, insulating layer 3, and outer semiconductive layer 4. The equalizing component 6 includes a lower support block 601 and an upper support block 602, which are symmetrically arranged at the bottom and top of the corrosion-resistant shielding layer 5, respectively. A flexible buffer strip 603 is provided between the lower support block 601 and the upper support block 602. The top of the flexible buffer strip 603 is fixedly connected to the upper support block 602, and the bottom of the flexible buffer strip 603 is fixedly connected to the lower support block 601. Two sets of flexible buffer strips 603 are symmetrically arranged about the vertical central axis of the lower support block 601. 2 and two sets of flexible buffer strips 603 together form an annular sleeve. The outer wall of the lower support block 601 is fixedly connected to the first slider 604, and the outer wall of the upper support block 602 is fixedly connected to the second slider 605. The inner walls of the first sliding block 701 and the second sliding block 702 are provided with limiting grooves 708. The first slider 604 and the second slider 605 are slidably connected inside the limiting grooves 708. The lower support block 601 provides an arc-shaped support layer between the insulating layer 3, the outer semiconductive layer 4 and the figure-eight structure composed of the first pushing block 705 and the second pushing block 706, in order to maintain the basic shape of the insulating layer 3 and the outer semiconductive layer 4 and prevent them from directly deforming and squeezing into the figure-eight opening structure.

[0038] Please see Figure 1 and Figure 8As shown, several mounting clamps 9 are installed at equal intervals on the outside of the outer sheath 8. The mounting clamps 9 are used to install and fix the outer sheath 8, and ensure that after installation, the first overlapping block 703 and the second overlapping block 704 are located above the pressure equalization component 6, and the first pushing block 705 and the second pushing block 706 are located below the pressure equalization component 6. The mounting clamps 9 include mounting blocks 901. The top of the mounting block 901 is fixedly connected to a first fixing block 902. The top of the first fixing block 902 is provided with a second fixing block 903. The first fixing block 902 and the second fixing block 903 are engaged together on the outside of the outer sheath 8. Fixing bolts 905 are installed at both ends of the first fixing block 902, and the fixing bolts 905 are used to fix the first fixing block 902 and the second fixing block 903. Protective pads 904 are fixedly connected to the inner walls of the first fixing block 902 and the second fixing block 903. The protective pads 904 are attached to the outer wall of the outer sheath 8.

[0039] Working principle: First, use expansion screws to fix the mounting block 901 to the reserved tubular busbar installation position in the rail transit tunnel. Then, the outer sheath 8 is clamped inside the first fixing block 902, and the second fixing block 903 is closed. The fixing bolt 905 is screwed in to complete the installation and fixation of the outer sheath 8. The protective pad 904 is in close contact with the outer wall of the outer sheath 8, which reduces the damage to the outer sheath 8 and buffers vibration. During installation, it must be ensured that after installation and fixation, the first stacked block 703 and the second stacked block 704 are located above the pressure equalization component 6, and the first pushing block 705 and the second pushing block 706 are located below the pressure equalization component 6.

[0040] The equalizing component 6 is enclosed outside the core structure consisting of the entire conductor tube 1, inner semiconductive layer 2, insulating layer 3, outer semiconductive layer 4, and corrosion-resistant shielding layer 5. The lower support block 601 rests below the core structure. Under its gravity, the lower support block 601 pushes downwards against the first pushing block 705 and the second pushing block 706 below it. Since the tops of the first pushing block 705 and the second pushing block 706 have two sets of upward-opening inclined surfaces, and because the lower part of the first pushing block 705 and the second pushing block 706 is restricted by the outer sheath 8 and cannot open downwards or move, when the lower support block 601 pushes downwards along the inclined surfaces, the first pushing block 705 and the second pushing block 706 convert the downward movement tendency into a lateral movement tendency through the inclined surfaces. The first sliding block 701 and the second... The second sliding block 702, along with the third sliding block 707, gradually slides along the guide groove 10. As the guide groove 10 gradually becomes shallower from bottom to top, the first sliding block 701 and the second sliding block 702 gradually move inward as they slide upward, gradually increasing the squeezing force on the lower support block 601 and the upper support block 602 from both sides. In addition, as the first sliding block 701 and the second sliding block 702 gradually slide, they also move together with the first overlapping block 703 and the second overlapping block 704, causing the overlapping part between them to gradually increase. Due to the gradually changing shape of the first overlapping block 703 and the second overlapping block 704, as the overlapping part gradually increases, the thickness of the two overlapping together also gradually increases, thereby gradually increasing the squeezing force on the upper support block 602 from the top.

[0041] This application ensures the smoothness of all contact surfaces between the sliding adjustment component 7, the pressure equalization component 6, and the guide groove 10, thereby minimizing the starting force required for the first sliding block 701 and the second sliding block 702 during sliding. This ensures that the weight of the inner core structure can be adjusted by the sliding adjustment component 7 when it is transferred downwards, rather than causing the bottom of the insulation layer 3 to undergo compression deformation. This minimizes the compression deformation at the bottom of the insulation layer 3. At the same time, during the sliding adjustment process, the first sliding block 701 and the second sliding block 702 can gradually increase the inward squeezing force on the pressure equalization component 6 from both sides and the top. This converts part of the squeezing force generated by the weight of the inner core structure on the lower side of the insulation layer 3 into an inward squeezing force on the inner core structure from both sides and the top through the sliding adjustment component 7 and the pressure equalization component 6. This ensures that the insulation layer 3 is subjected to force throughout the entire circumference, thereby reducing the deformation of the lower side of the insulation layer 3 and increasing the deformation of the sides and the top of the insulation layer 3 to even out the compression deformation of the insulation layer 3 throughout the entire circumference.

[0042] When the first sliding block 701 and the second sliding block 702 slide to their travel limit and come to a stop, the self-weight of the inner core structure still exists, but the force pattern has changed. After the first sliding block 701 and the second sliding block 702 move into place in the circumferential direction, they form a circumferential support structure together with the pressure equalization component 6 through the increase of the inward squeezing force from both sides and the top. This redistributes the vertical gravity that was originally concentrated on the lower side of the insulation layer 3 to the circumferential direction for uniform bearing, forming an arched clamping support. This avoids the gravity from continuously concentrating and squeezing the lower side of the insulation layer 3. At this time, the squeezing force borne by the lower insulation layer 3 has been greatly reduced, so that the first sliding block 701 and the second sliding block 702 can still play a role in weakening the squeezing force on the lower side of the insulation layer 3 even after the sliding is completed.

[0043] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A moisture-proof and corrosion-resistant shielded insulated tubular busbar for underground rail transit tunnels, characterized in that, The device includes a conductor tube, an inner semiconductive layer coaxially wrapped around the outside of the conductor tube, an insulating layer coaxially wrapped around the outside of the inner semiconductive layer, an outer semiconductive layer coaxially wrapped around the outside of the insulating layer, a corrosion-resistant shielding layer wrapped around the outside of the outer semiconductive layer, a voltage equalization component disposed outside the corrosion-resistant shielding layer, and a sliding adjustment component disposed outside the voltage equalization component. The sliding adjustment component includes a first sliding block and a second sliding block. The first sliding block and the second sliding block are respectively attached to the left and right sides of the pressure equalization component, and the first sliding block and the second sliding block form an annular sleeve. The bottom end of the first sliding block is integrally provided with a first pushing block, and the bottom end of the second sliding block is integrally provided with a second pushing block. The first pushing block and the second pushing block together form an upward-opening figure-eight structure. The top end of the first sliding block is integrally connected with a first overlapping block, and the top end of the second sliding block is integrally connected with a second overlapping block. The first overlapping block overlaps on top of the second overlapping block, and the first overlapping block and the second overlapping block are slidably connected. When the gravity of the conductor tube and the inner semiconductive layer acts on the inner wall of the sliding adjustment component, the downward gravity drives the pressure equalization component to push the first and second push blocks downward. Under the action of the upward-opening figure-eight structure, the downward force is transformed into the force of the first and second sliding blocks sliding along the circumference, thereby increasing the overlapping part between the first and second overlapping blocks.

2. The moisture-proof and corrosion-resistant shielded insulated tubular busbar for underground rail transit tunnels according to claim 1, characterized in that: The sliding adjustment component is covered by an outer protective sleeve, and the inner wall of the outer protective sleeve is provided with several guide grooves at equal intervals, the depth of the guide grooves gradually decreasing from bottom to top.

3. The moisture-proof and corrosion-resistant shielded insulated tubular busbar for underground rail transit tunnels according to claim 2, characterized in that: The outer walls of both the first and second sliding blocks are fixedly connected to a third slider, which is slidably connected inside the guide groove.

4. The moisture-proof and corrosion-resistant shielded insulated tubular busbar for underground rail transit tunnels according to claim 1, characterized in that: The pressure equalization component includes a lower support block and an upper support block, which are symmetrically arranged at the bottom and top of the corrosion-resistant shielding layer, respectively.

5. The moisture-proof and corrosion-resistant shielded insulated tubular busbar for underground rail transit tunnels according to claim 4, characterized in that: A flexible buffer strip is provided between the lower support block and the upper support block. The top of the flexible buffer strip is fixedly connected to the upper support block, and the bottom of the flexible buffer strip is fixedly connected to the lower support block.

6. The moisture-proof and corrosion-resistant shielded insulated tubular busbar for underground rail transit tunnels according to claim 5, characterized in that: The flexible buffer strips are arranged symmetrically in two sets about the vertical central axis of the lower support block. The lower support block, the upper support block, and the two sets of flexible buffer strips together form a ring-shaped sleeve.

7. The moisture-proof and corrosion-resistant shielded insulated tubular busbar for underground rail transit tunnels according to claim 4, characterized in that: The lower support block is fixedly connected to the outer wall of a first slider, and the upper support block is fixedly connected to the outer wall of a second slider. The inner walls of the first slider and the second slider are provided with limit grooves, and the first slider and the second slider are slidably connected inside the limit grooves.

8. The moisture-proof and corrosion-resistant shielded insulated tubular busbar for underground rail transit tunnels according to claim 2, characterized in that: Several mounting clamps are installed at equal intervals on the outside of the outer sheath. The mounting clamps are used to install and fix the outer sheath, and ensure that after installation, the first stacked block and the second stacked block are located above the pressure equalization component, and the first pushing block and the second pushing block are located below the pressure equalization component.

9. The moisture-proof and corrosion-resistant shielded insulated tubular busbar for underground rail transit tunnels according to claim 8, characterized in that: The mounting fixture includes a mounting block, a first fixing block is fixedly connected to the top of the mounting block, a second fixing block is provided on the top of the first fixing block, the first fixing block and the second fixing block are engaged together on the outside of the outer sheath, and fixing bolts are installed at both ends of the first fixing block, and the fixing bolts are used to fix the first fixing block and the second fixing block.

10. The moisture-proof and corrosion-resistant shielded insulated tubular busbar for underground rail transit tunnels according to claim 9, characterized in that: The inner walls of both the first and second fixing blocks are fixedly connected with protective pads, which are attached to the outer wall of the outer sheath.

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