A telescopic fitting for sliding support drainage of a tube nut

Abstract

This invention discloses a telescopic fitting for sliding support and current diversion of a busbar, belonging to the field of busbar connector technology. It is assembled between a busbar and an equipment terminal and includes a busbar clamp, an equipment clamp, a support rod assembly, a steering block, and telescopic wires. The busbar clamp is fixedly installed at the end of the busbar, and the equipment clamp is fixedly installed at the end of the equipment terminal. The two ends of multiple telescopic wires are respectively fixedly installed on the busbar clamp and the equipment clamp. The outer end of the equipment clamp is rotatably assembled to one end of the steering block. The support rod assembly is movable and assembled inside the busbar. This invention, through the design of separating mechanical support and electrical current diversion, avoids the phenomenon of excessive current in the support rod causing overheating under special environments due to skin effect, electromagnetic interference, and other factors. Simultaneously, all metal parts of the telescopic fitting can be connected to the charged body, avoiding floating potential and preventing floating discharge under high voltage.

Description

Technical Field

[0001] This invention belongs to the field of busbar connector technology, and specifically provides a telescopic fitting for sliding support and drainage of busbars. Background Technology

[0002] In high-voltage direct current converter stations and substations, the connection between the busbar and equipment terminals requires a telescopic fixing structure to accommodate thermal expansion and contraction. However, traditional telescopic fittings present two major technical challenges:

[0003] Firstly, under the combined influence of the skin effect and the complex electromagnetic environment, the support component will divert some current, causing its own current to increase abnormally and overheating, while the temperature of the main current conductor remains normal. This local overheating may cause the support component to anneal, thereby reducing its mechanical strength. According to the operating specifications of the valve hall hardware of the converter station, its temperature should not exceed 90°C. Exceeding this threshold will trigger an alarm. If the high temperature continues, it may further lead to component failure or even cause a power outage.

[0004] Secondly, if insulation is simply added to the support to suppress current shunting, improper methods may cause some metal parts to generate floating potential, which may lead to floating discharge under high voltage, resulting in ozone corrosion of equipment and electromagnetic interference control systems, ultimately causing power grid operation accidents.

[0005] These problems seriously threaten the safe and stable operation of the power grid. Therefore, there is an urgent need for a sliding support current-draining telescopic fitting for the tube nut that can simultaneously solve the problems of overheating of the support components and floating discharge. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a telescopic fitting for sliding support and drainage of a pipe nut.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a telescopic fitting for sliding support and drainage of a busbar, assembled between the busbar and the equipment terminal, comprising a busbar clamp, an equipment clamp, a support rod assembly, a steering block, and telescopic wires. The busbar clamp is fixedly installed at the end of the busbar, and the equipment clamp is fixedly installed at the end of the equipment terminal. The two ends of a plurality of telescopic wires are respectively fixedly installed on the busbar clamp and the equipment clamp. The outer end of the equipment clamp is rotatably assembled to one end of the steering block. The support rod assembly is movably assembled inside the busbar, and the outer end of the support rod assembly passes through the busbar clamp and is rotatably assembled to the other end of the steering block. The support rod assembly is insulated from the busbar clamp and the busbar. The busbar clamp, the equipment clamp, the support rod assembly, and the steering block are all conductive metal components.

[0008] Furthermore, the tube clamp includes a clamp body, a pressure cap, and a mounting plate. The clamp body and the pressure cap are assembled and installed at the end of the tube busbar by bolts and nuts. The mounting plate is fixedly installed on the end face of the clamp body, and a bushing is fixedly installed in the inner hole of the mounting plate. The bushing is made of insulating material.

[0009] Furthermore, the support rod assembly includes a support rod, a support ring, and a mounting ring. The mounting ring is fixedly installed on the surface of the support ring, and one end of the support rod is fixedly installed in the middle of the support ring. An insulating ring is fixedly installed on the outer ring of the support ring and is inserted into the busbar. The other end of the support rod passes through the mounting plate.

[0010] Furthermore, the outer wall of the mounting plate is integrally formed with an inner cylinder, and an outer cylinder is screwed to the outer side of the inner cylinder. The inner wall of the inner cylinder and the outer wall of the outer cylinder are respectively provided with an inner oil cavity and an outer oil cavity. A piston cavity is evenly provided in the inner oil cavity, and a piston is movably assembled in the piston cavity. A support head is fixedly installed at the inner end of the piston, and the support rod is located between multiple support heads. The support head is made of insulating material.

[0011] Furthermore, the outer wall of the outer cylinder is provided with an adjustment cavity communicating with the outer oil cavity. An adjustment assembly is assembled in the adjustment cavity. The adjustment assembly includes an installation cylinder, which is fixedly installed in the adjustment cavity. A plug is fixedly installed on the outer side of the inner wall of the installation cylinder. A spring is fixedly installed on the inner wall of the plug. A baffle is fixedly installed on the inner end of the spring, and the baffle is movably assembled in the installation cylinder. A bellows is fixedly installed between the plug and the baffle, located outside the spring.

[0012] Furthermore, a cleaning ring is fixedly installed on the outer end of the inner wall of the inner cylinder.

[0013] Furthermore, reinforcing ribs are uniformly fixed between the outer circumferential surface of the inner cylinder and the end face of the mounting plate.

[0014] Furthermore, a limiting ring is fixedly installed on the outer circumferential surface of the support rod, and a wire support assembly is sleeved on the outer circumferential surface of the support rod, with the wire support assembly located between the two limiting rings. The wire support assembly includes a movable cylinder, and telescopic rods are uniformly fixedly installed on the outer circumferential surface of the movable cylinder. Guide rings are fixedly installed on the outer ends of the telescopic rods, and the guide rings correspond one-to-one with the telescopic wires. The inner diameter of the guide ring is larger than the diameter of the telescopic wire.

[0015] Furthermore, guide plates are fixedly installed at both ends of the guide ring and at the end closest to the telescopic rod, and the inner surface of the guide ring and the inner surface of the guide plate form a hyperbolic paraboloid.

[0016] The beneficial effects of using this invention are:

[0017] This invention, through the design of separating mechanical support and electrical current conduction, avoids the phenomenon of excessive current in the support rod causing heat generation under special environments due to factors such as skin effect and electromagnetic fields. At the same time, all metal parts of the telescopic fitting can be connected to the charged body, avoiding floating potential and preventing floating discharge under high voltage.

[0018] This invention achieves radial adaptive floating of the support rod through a floating support structure and hydraulic buffering via an oil chamber and piston, significantly reducing wear and extending mechanical life. At the same time, the temperature and pressure compensation mechanism ensures stability under high temperature and high pressure.

[0019] This invention uses a conductor support assembly with a hyperbolic paraboloid guide ring to limit the bending radius of the conductor, preventing fatigue fracture and improving the reliability and safety of the flow. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of Embodiment 1 of the present invention.

[0021] Figure 2 This is a three-dimensional schematic diagram of the support rod assembly in Embodiment 1 of the present invention.

[0022] Figure 3 This is a three-dimensional schematic diagram of the steering block in Embodiment 1 of the present invention.

[0023] Figure 4 This is a three-dimensional schematic diagram of Embodiment 2 of the present invention.

[0024] Figure 5 This is a three-dimensional schematic diagram of the female clamp in Embodiment 2 of the present invention.

[0025] Figure 6 This is a three-dimensional schematic diagram of the inner and outer cylinders in Embodiment 2 of the present invention.

[0026] Figure 7 This is a cross-sectional view of the inner and outer cylinders in Embodiment 2 of the present invention.

[0027] Figure 8 For the present invention Figure 7 A magnified view of part a in the middle.

[0028] Figure 9 This is a three-dimensional schematic diagram of the support rod in Embodiment 3 of the present invention.

[0029] Figure 10 This is a cross-sectional view of the support rod in Embodiment 3 of the present invention.

[0030] The reference numerals in the attached drawings include: 1. Pipe clamp, 11. Clamp body, 12. Pressure cap, 13. Mounting plate, 14. Inner cylinder, 141. Inner oil chamber, 142. Piston chamber, 15. Outer cylinder, 151. Outer oil chamber, 152. Adjustment chamber, 153. Mounting cylinder, 154. Plug, 155. Spring, 156. Baffle, 157. Bellows, 16. Piston, 17. Support head, 18. Cleaning ring, 19. Reinforcing rib, 2. Equipment clamp, 3. Support rod assembly, 31. Support rod, 311. Limiting ring, 32. Support ring, 33. Mounting ring, 34. Insulating ring, 35. Moving cylinder, 351. Telescopic rod, 352. Guide ring, 353. Guide plate, 4. Steering block, 5. Telescopic wire, 6. Pipe busbar, 7. Equipment terminal. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1:

[0033] Reference Figures 1 to 3 A telescopic fitting for sliding support and drainage of a busbar is assembled between a busbar 6 and an equipment terminal 7. It includes a busbar clamp 1, an equipment clamp 2, a support rod assembly 3, a steering block 4, and telescopic conductors 5. The busbar clamp 1 is fixedly installed at the end of the busbar 6, and the equipment clamp 2 is fixedly installed at the end of the equipment terminal 7. The two ends of multiple telescopic conductors 5 are respectively fixedly installed on the busbar clamp 1 and the equipment clamp 2. The outer end of the equipment clamp 2 is rotatably mounted on one end of the steering block 4. The support rod assembly 3 is movably mounted inside the busbar 6, and its outer end passes through the busbar clamp 1 and is rotatably mounted on the other end of the steering block 4. The support rod assembly 3 is insulated from both the busbar clamp 1 and the busbar 6. The busbar clamp 1, the equipment clamp 2, the support rod assembly 3, and the steering block 4 are all conductive metal components.

[0034] The busbar clamp 1 is installed at the end of the busbar 6, and the equipment clamp 2 is installed at the end of the equipment terminal. The two are connected by a telescopic wire 5. The telescopic wire 5 is a flexible wire, and multiple telescopic wires 5 of equal length are required. The number is determined according to the current carrying capacity of the telescopic fitting.

[0035] The support rod assembly 3 and the busbar 6 are movable assemblies. When the busbar 6 deforms due to thermal expansion and contraction, its end can move outside the support rod assembly 3 without affecting the supporting function of the support rod assembly 3.

[0036] The two ends of the steering block 4 are hinged to the ends of the equipment chuck 2 and the support rod assembly 3, respectively, and the hinge axes at both ends are perpendicular, which can realize the ability to adjust the support rod assembly 3 and the busbar 6 at a certain angle in all directions.

[0037] The design of insulation and conductivity within the telescopic fittings ensures that the support rod assembly 3 is insulated from the tube clamp 1 and the tube busbar 6. At the same time, the support rod assembly 3 is connected to the equipment clamp 2 through the steering block 4. Based on the fact that all are conductive metal components, the potential of the support rod assembly 3 is kept at the same potential as the tube busbar 6 and the telescopic conductor 5, avoiding the generation of floating potential and effectively preventing the occurrence of floating discharge phenomenon, thus improving safety.

[0038] By separating the mechanical support of the support rod assembly 3 from the electrical current conduction of the telescopic wire 5, the mechanical support rod is prevented from overheating due to excessive current in the support component under special environments caused by skin effect, electromagnetic interference, etc.

[0039] Specifically, the busbar clamp 1 includes a clamp body 11, a pressure cap 12, and a mounting plate 13. The clamp body 11 and the pressure cap 12 are assembled and installed at the end of the busbar 6 by bolts and nuts. The mounting plate 13 is fixedly installed on the end face of the clamp body 11, and a bushing is fixedly installed in the inner hole of the mounting plate 13. The bushing is made of insulating material.

[0040] Specifically, the support rod assembly 3 includes a support rod 31, a support ring 32, and a mounting ring 33. The mounting ring 33 is fixedly installed on the surface of the support ring 32, and one end of the support rod 31 is fixedly installed in the middle of the support ring 32. An insulating ring 34 is fixedly installed on the outer ring of the support ring 32, and the insulating ring 34 is inserted into the busbar 6. The other end of the support rod 31 passes through the mounting plate 13.

[0041] The bushing is located inside the inner hole of the chuck body 11 and the mounting plate 13 to ensure insulation between the support rod 31 and the tube chuck 1. The insulating ring 34 ensures insulation between the support rod assembly 3 and the tube busbar 6. The inner diameter of the chuck body 11 and the mounting plate 13 is larger than the diameter of the support rod 31. By setting the structure of the support ring 32, the mounting ring 33 and the insulating ring 34, the support rod assembly 3 can stably move relative to the tube busbar 6. The insulating ring 34 slides on the inner wall of the tube busbar 6 and the support rod 31 slides in the bushing, which works together to achieve smooth expansion and contraction. This avoids the tube busbar 6 from being affected by factors such as thermal expansion and contraction, which can cause great pressure on the support rod assembly 3 when the end moves, thereby improving the stability and service life of the support rod assembly 3.

[0042] Both the bushing and the insulating ring 34 can be made of high-strength engineering plastics, such as epoxy resin or nylon, to ensure stable insulation performance and resistance to high-temperature aging. The insulating materials mentioned later can also be made of the above materials.

[0043] Example 2:

[0044] When the end of the busbar 6 moves or deflects due to thermal expansion and contraction or external forces, the support rod 31 will experience slight displacement and wear when in contact with the bushing. Long-term wear of the support rod 31 will lead to a reduction in its diameter or surface damage, which may cause excessive clearance between the support rod 31 and the bushing. This can cause the support rod to sway or get stuck when the busbar moves. If it gets stuck, the busbar 6 will be unable to move on the axis, which may lead to mechanical instability or even breakage of the support rod. At the same time, wear may damage the insulation layer (i.e., the bushing), causing a short circuit between the support rod and the busbar clamp 1 or the busbar 6, generating an electric arc. Wear of the bushing may cause abnormal potential of the support rod 31, which may lead to grounding faults or fires in severe cases.

[0045] Reference Figures 4 to 8 Based on Example 1, the bushing is removed, and the following improvements are made:

[0046] Specifically, the outer wall of the mounting plate 13 is integrally formed with an inner cylinder 14, and an outer cylinder 15 is screwed to the outer side of the inner cylinder 14. The inner wall of the inner cylinder 14 and the outer wall of the outer cylinder 15 are respectively provided with an inner oil cavity 141 and an outer oil cavity 151. A piston cavity 142 is evenly provided in the inner oil cavity 141, and a piston 16 is movably assembled in the piston cavity 142. A support head 17 is fixedly installed at the inner end of the piston 16, and the support rod 31 is located between multiple support heads 17. The support head 17 is made of insulating material.

[0047] The inner oil cavity 141 and the outer oil cavity 151 form an annular oil cavity, which is filled with oil. The addition of the inner cylinder 14, outer cylinder 15 and piston 16 structure can effectively buffer the offset of the support rod 31, reduce the wear of the support rod 31 while maintaining support for the support rod 31, and improve the service life and safety of the support rod assembly 3.

[0048] When the support rod 31 deflects and causes one piston 16 to move, it will push the oil flow, which in turn will cause the other three pistons 16 to move radially, thus achieving floating support for the support rod 31. By dispersing the concentrated stress through multi-point coordinated floating, the contact pressure between the support rod 31 and the support head 17 is reduced, thereby reducing friction and wear, increasing the stability of the support rod 31, and extending the service life of the support rod 31.

[0049] The support head 17 is made of insulating material to ensure insulation between the support rod 31 and the tube clamp 1, and to ensure equipotential between the support rod 31 and the tube clamp 1. The surface of the support head 17 can be coated with polytetrafluoroethylene to reduce the coefficient of friction.

[0050] The inner cylinder 14 and the outer cylinder 15 are installed by threaded connection. The outer side of the inner cylinder 14 can be wrapped with polytetrafluoroethylene raw material tape to achieve a seal, or other methods can be used to achieve a seal.

[0051] Specifically, the outer wall of the outer cylinder 15 is provided with an adjustment cavity 152 that communicates with the outer oil cavity 151. An adjustment assembly is installed in the adjustment cavity 152. The adjustment assembly includes an installation cylinder 153, which is fixedly installed in the adjustment cavity 152. A plug 154 is fixedly installed on the outer side of the inner wall of the installation cylinder 153. A spring 155 is fixedly installed on the inner wall of the plug 154. A baffle 156 is fixedly installed on the inner end of the spring 155. The baffle 156 is movably assembled in the installation cylinder 153. A bellows 157 is fixedly installed between the plug 154 and the baffle 156 and on the outer side of the spring 155.

[0052] The regulating component acts as a temperature and pressure compensator. When the ambient temperature rises, the oil pressure in the annular oil chamber increases, and the oil applies pressure to the baffle 156 at the regulating chamber 152, causing the bellows 157 to contract and compress the spring 155, increasing the volume of the oil chamber and maintaining the hydraulic pressure within the indicated range. When the ambient temperature drops, the spring 155 extends, causing the bellows 157 to extend, thus maintaining stable oil pressure. The regulating component can automatically adjust the volume of the oil chamber according to the ambient temperature to maintain stable oil pressure, avoiding excessive clamping and loosening of the support rod 31 due to thermal expansion and contraction, effectively limiting and supporting the support rod 31, and ensuring the stability of this telescopic hardware under harsh working conditions, reducing mechanical failures or electrical accidents caused by the deviation of the support rod 31. In addition, the regulating component can also be used to buffer pressure shocks.

[0053] Transformer oil can be used. Before injecting the oil, the outer cylinder 15 is installed on the inner cylinder 14, and then the oil is injected through the regulating chamber 152. Finally, the regulating component is installed. This method also facilitates the replacement of the oil.

[0054] The mounting cylinder 153 can be installed in the regulating cavity 152 by means of a threaded connection, and the plug 154 can be installed in the mounting cylinder 153 by means of a threaded connection. The threaded connection is sealed. In addition, a small hole can be opened on the plug 154 to keep the pressure inside the bellows 157 the same as the external environment.

[0055] Specifically, a cleaning ring 18 is fixedly installed on the outer end of the inner wall of the inner cylinder 14.

[0056] The cleaning ring 18 can be made of sponge or similar material, which can effectively clean the dust on the surface of the support rod 31, prevent the accumulation of dirt from affecting the insulation performance, and will not affect the operation of the support rod 31.

[0057] Specifically, reinforcing ribs 19 are uniformly fixed between the outer circumferential surface of the inner cylinder 14 and the end face of the mounting plate 13.

[0058] The reinforcing rib 19 is used to increase the strength of the inner cylinder 14. The reinforcing rib 19 can be designed as a trapezoidal structure, and its outer end face is used to limit the position of the outer cylinder 15, thereby ensuring that the inner oil cavity 141 and the outer oil cavity 151 can be accurately matched.

[0059] This embodiment reduces the wear of the support rod 31 and improves temperature adaptability through floating support and temperature and pressure compensation, which can effectively extend the service life of the components, enhance stability, avoid floating discharge, and meet the requirements of safe operation of high-voltage power grids.

[0060] Example 3:

[0061] When the busbar 6 is bent, the telescopic conductor 5 located on the outside of the bend tends to be taut, while the telescopic conductor 5 located on the inside of the bend is more relaxed and has a greater degree of bending. Long-term large-degree bending or repeated bending will cause metal fatigue. Especially when the bending radius is too small, the internal stress of the telescopic conductor 5 will be concentrated, which will easily produce micro-cracks. In the long run, it may lead to breakage, causing current interruption and directly leading to current conduction failure, causing local overheating or arcing. Excessive bending may damage the insulation layer of the telescopic conductor 5, causing short circuit or discharge.

[0062] Reference Figure 9 and Figure 10 Based on Example 1, the following improvements are made:

[0063] Specifically, a limiting ring 311 is fixedly installed on the outer circumferential surface of the support rod 31, and a wire support assembly is sleeved on the outer circumferential surface of the support rod 31. The wire support assembly is located between two limiting rings 311. The wire support assembly includes a movable cylinder 35. Telescopic rods 351 are uniformly fixedly installed on the outer circumferential surface of the movable cylinder 35. Guide rings 352 are fixedly installed on the outer ends of the telescopic rods 351, and the guide rings 352 correspond one-to-one with the telescopic wires 5. The inner diameter of the guide rings 352 is larger than the diameter of the telescopic wires 5.

[0064] Specifically, guide plates 353 are fixedly installed at both ends of the guide ring 352 and at the end closest to the telescopic rod 351, and the inner surface of the guide ring 352 and the inner surface of the guide plate 353 form a hyperbolic paraboloid.

[0065] The limiting ring 311 supports and limits the telescopic conductor 5. At the same time, the hyperbolic paraboloid design can limit the degree of bending in the middle of the telescopic conductor 5, ensuring uniform bending, reducing the risk of fatigue fracture of the telescopic conductor 5, and extending the conductor's life.

[0066] The hyperbolic paraboloid ensures that the bending force of the telescopic conductor 5 is evenly distributed, and the bending radius is controlled to be more than 10 times the diameter of the telescopic conductor 5 (far exceeding the safety threshold), thus avoiding stress concentration.

[0067] The end of the telescopic guide wire 5 is provided with a mounting component perpendicular to the female clamp 1 and the equipment clamp 2 to guide the end of the telescopic guide wire 5. In addition, a guide structure can be provided on the outer ring of the mounting component. The guide structure is a cylindrical structure with an arc-shaped surface on the inner wall end to limit the degree of bending of the end of the telescopic guide wire 5. By limiting the maximum degree of bending of the telescopic guide wire 5 as a whole through the guide wire support assembly and the guide structure, excessive bending in some areas can be effectively avoided, thereby improving the service life of the telescopic guide wire 5.

[0068] When the busbar 6 bends, it causes the telescopic conductor 5 to deform, which in turn causes the telescopic rod 351 to extend or shorten, ensuring that the support assembly always keeps in contact with the telescopic conductor 5, thus ensuring reliable flow conduction of the telescopic conductor 5 under dynamic working conditions.

[0069] Both the guide ring 352 and the guide plate 353 are made of insulating material to maintain the insulation between the telescopic wire 5 and the wire support assembly and prevent partial discharge. The surfaces of both the guide ring 352 and the guide plate 353 can be coated with polytetrafluoroethylene to reduce the coefficient of friction.

[0070] Based on the separation of current guiding and support in Embodiment 1, this embodiment adds mechanical protection for the telescopic conductor 5, effectively preventing fatigue of the telescopic conductor 5, optimizing current distribution, and improving safety.

[0071] Example 4:

[0072] This solution combines Embodiment 2 and Embodiment 3, simultaneously protecting both the support rod 31 and the telescopic conductor 5. The floating support reduces wear on the support rod 31, and the conductor support reduces fatigue in the telescopic conductor 5, thus extending the overall lifespan of the fittings. The dual protection reduces the probability of failure. In high-voltage environments such as DC converter stations, thermal expansion and contraction and electromagnetic forces are complex. The combined design of Embodiment 2 and Embodiment 3 ensures the dynamic stability of the support rod 31 and the telescopic conductor 5, enhancing high-voltage adaptability.

[0073] The above content is only a preferred embodiment of the present invention. For those skilled in the art, many changes can be made in the specific implementation and application scope based on the concept of the present invention. As long as these changes do not depart from the concept of the present invention, they all fall within the protection scope of the present invention.

Claims

1. A telescopic fitting for sliding support and drainage of a busbar, assembled between a busbar (6) and a device terminal (7), characterized in that: The device includes a busbar clamp (1), a device clamp (2), a support rod assembly (3), a steering block (4), and a telescopic wire (5). The busbar clamp (1) is fixedly installed at the end of the busbar (6), and the device clamp (2) is fixedly installed at the end of the device terminal (7). The two ends of multiple telescopic wires (5) are respectively fixedly installed on the busbar clamp (1) and the device clamp (2). The outer end of the device clamp (2) is rotatably assembled to one end of the steering block (4). The support rod assembly (3) is movably assembled inside the busbar (6), and the outer end of the support rod assembly (3) passes through the busbar clamp (1) and is rotatably assembled to the other end of the steering block (4). The support rod assembly (3) is insulated from the busbar clamp (1) and the busbar (6). The busbar clamp (1), the device clamp (2), the support rod assembly (3), and the steering block (4) are all conductive metal parts. The tube clamp (1) includes a clamp body (11), a pressure cap (12) and a mounting plate (13). The clamp body (11) and the pressure cap (12) are assembled and installed at the end of the tube busbar (6) by bolts and nuts. The mounting plate (13) is fixedly installed on the end face of the clamp body (11), and a bushing is fixedly installed in the inner hole of the mounting plate (13). The bushing is made of insulating material. The outer wall of the mounting plate (13) is integrally formed with an inner cylinder (14), and an outer cylinder (15) is screwed to the outer side of the inner cylinder (14). The inner wall of the inner cylinder (14) and the outer wall of the outer cylinder (15) are respectively provided with an inner oil cavity (141) and an outer oil cavity (151). A piston cavity (142) is evenly provided in the inner oil cavity (141), and a piston (16) is movably assembled in the piston cavity (142). A support head (17) is fixedly installed at the inner end of the piston (16). The outer wall of the outer cylinder (15) is provided with an adjustment cavity (152) that communicates with the outer oil cavity (151). An adjustment assembly is installed in the adjustment cavity (152). The adjustment assembly includes an installation cylinder (153). The installation cylinder (153) is fixedly installed in the adjustment cavity (152). A plug (154) is fixedly installed on the outer side of the inner wall of the installation cylinder (153). A spring (155) is fixedly installed on the inner wall of the plug (154). A baffle (156) is fixedly installed on the inner end of the spring (155). The baffle (156) is movably assembled in the installation cylinder (153). A bellows (157) is fixedly installed between the plug (154) and the baffle (156) and on the outer side of the spring (155).

2. The telescopic fitting for sliding support and drainage of a tube nut as described in claim 1, characterized in that: The support rod assembly (3) includes a support rod (31), a support ring (32) and a mounting ring (33). The mounting ring (33) is fixedly installed on the surface of the support ring (32), and one end of the support rod (31) is fixedly installed in the middle of the support ring (32). An insulating ring (34) is fixedly installed on the outer ring of the support ring (32), and the insulating ring (34) is inserted into the busbar (6). The other end of the support rod (31) passes through the mounting plate (13).

3. The telescopic fitting for sliding support and drainage of a tube nut as described in claim 2, characterized in that: The support rod (31) is located between a plurality of support heads (17), which are made of insulating material.

4. The telescopic fitting for sliding support and drainage of a tube nut as described in claim 3, characterized in that: A cleaning ring (18) is fixedly installed on the outer end of the inner wall of the inner cylinder (14).

5. The telescopic fitting for sliding support and drainage of a tube nut as described in claim 3, characterized in that: Reinforcing ribs (19) are uniformly fixed between the outer circumferential surface of the inner cylinder (14) and the end face of the mounting plate (13).

6. The telescopic fitting for sliding support and drainage of a tube nut as described in claim 2, characterized in that: The outer circumferential surface of the support rod (31) is fixedly installed with a limiting ring (311). The outer circumferential surface of the support rod (31) is fitted with a wire support assembly, and the wire support assembly is located between two limiting rings (311). The wire support assembly includes a movable cylinder (35). The outer circumferential surface of the movable cylinder (35) is uniformly fixedly installed with telescopic rods (351). The outer ends of the telescopic rods (351) are all fixedly installed with guide rings (352). The guide rings (352) correspond one-to-one with the telescopic wires (5). The inner diameter of the guide rings (352) is larger than the diameter of the telescopic wires (5).

7. A telescopic fitting for sliding support and drainage of a duct as described in claim 6, characterized in that: Guide plates (353) are fixedly installed at both ends of the guide ring (352) and at one end close to the telescopic rod (351). The inner surface of the guide ring (352) and the inner surface of the guide plate (353) form a hyperbolic paraboloid.

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