Environment-friendly PVC electric power sheath tube

Abstract

The invention belongs to the technical field of electric power protective sleeves, and discloses an environment-friendly PVC electric power protective sleeve which comprises a sleeve, a connecting sleeve and an auxiliary assembly are installed on the protective sleeve, the two ends of the protective sleeve are provided with an inserting end and a socket end respectively, the tail ends of the inserting end and the socket end are provided with limiting tables, fixing holes are formed in the limiting tables, and the fixing holes are communicated with the connecting sleeve. A first inserting groove and a second inserting groove are formed in the two ends of the connecting sleeve, a bearing groove is formed in an inner cavity of the connecting sleeve, a guide wheel is installed in an inner cavity of the bearing groove, the first inserting groove and the second inserting groove are connected with the inserting end and the socket end in an inserted mode respectively, and the auxiliary assembly comprises an inner insulating layer and a heat absorbing plate. According to the core technical scheme, the environment-friendly PVC electric power protective sleeve comprises a protective sleeve body, a connecting sleeve and an auxiliary protective heat dissipation assembly, all the assemblies cooperate with one another, and integration of multiple functions of protection, heat dissipation and connection is achieved.

Description

Technical Field

[0001] This invention relates to the field of power sheathing technology, specifically to an environmentally friendly PVC power sheathing. Background Technology

[0002] As a core component ensuring the safe operation of cables, the performance of power cable conduits directly affects the stability, safety, and service life of power transmission. With the deepening of global environmental protection concepts and the increasing demands for protective equipment in power engineering, traditional PVC power cable conduits can no longer meet the diverse needs of modern engineering, and their technical shortcomings are becoming increasingly apparent.

[0003] 1. Existing PVC power cable conduit connection methods are mainly divided into three categories: socket type, adhesive type, and flange type. Socket type connections rely solely on the interference fit of the conduit itself. Under soil settlement, geological changes, or external pressure, they are prone to loosening and detachment, leading to rainwater and mud seeping into the conduit, causing the cable insulation layer to become damp and age, resulting in short circuit faults. Adhesive type connections require special adhesives, and the bonding effect is greatly affected by the temperature and humidity of the construction environment. After long-term use, the adhesive is prone to aging and failure, and the bonded joint is difficult to disassemble and maintain. Flange type connections have a complex structure, low installation efficiency, and the metal flanges are susceptible to soil corrosion, increasing maintenance costs and safety risks. In addition, traditional connection structures lack precise positioning and double fixing design, resulting in insufficient sealing at the joint. In areas with high groundwater levels, water seepage is particularly prominent. According to incomplete statistics, approximately 30% of underground cable faults are directly related to loose conduit connections and water seepage.

[0004] 2. Cables continuously generate Joule heat during operation, especially in densely laid, high-load, or enclosed underground environments, where heat easily accumulates inside the conduit. Traditional PVC conduits are single-tube structures with a thermal conductivity of only 0.16-0.20 W / (m·K), relying primarily on natural heat dissipation, resulting in extremely low efficiency. When the temperature inside the conduit exceeds 70℃, the aging rate of the cable insulation layer (such as XLPE insulation) accelerates significantly, shortening its service life by more than 50%. In extreme cases, high temperatures can cause the insulation layer to melt and break down, leading to serious electrical accidents. While some improved conduits incorporate heat dissipation grooves, the heat dissipation area is limited, and the groove structure can reduce the mechanical strength of the tube, making it difficult to balance heat dissipation performance and structural stability.

[0005] 3. Traditional PVC conduit's protective function is concentrated on basic mechanical protection, lacking sufficient impact resistance, wear resistance, and corrosion resistance. During underground construction, it is easily damaged by impacts from excavators, gravel, and other hard objects; long-term burial in acidic soil, saline-alkali land, and other corrosive environments can cause the conduit surface to age and crack, losing its protective function; some conduits lack effective insulation reinforcement designs, resulting in decreased insulation performance in humid environments and posing a risk of leakage. Furthermore, the cable threading process of traditional conduits relies on manual dragging, resulting in high sliding friction between the inner wall of the conduit and the outer sheath of the cable. This not only increases construction difficulty and reduces installation efficiency but also easily scratches the cable sheath, damages the cable insulation layer, and creates safety hazards.

[0006] To address the aforementioned technical challenges, there is an urgent need to develop a new type of PVC power sheathing pipe that integrates excellent environmental performance, robust and reliable connections, efficient and stable heat dissipation, and comprehensive and diverse protection. This will meet the high standards of modern power engineering for protective equipment and promote the development of the power protection industry towards environmental friendliness, high performance, and intelligence. Summary of the Invention

[0007] The purpose of this section is to outline some aspects of the embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0008] In view of the problems existing in the current environmentally friendly PVC power cable sheathing pipes, this invention is proposed.

[0009] Therefore, the present invention provides an environmentally friendly PVC power sheath, the core technical solution of which includes a sheath body, a connecting sleeve and an auxiliary protection and heat dissipation component. The components work together to achieve multiple functions of protection, heat dissipation and connection.

[0010] To address the aforementioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0011] An environmentally friendly PVC power conduit includes a conduit with a connecting sleeve and auxiliary components installed on the conduit.

[0012] The sheath tube is provided with an insertion end and a socket end at both ends, and a limiting platform is provided at the end of the insertion end and the socket end, and a fixing hole is provided on the limiting platform;

[0013] The connecting sleeve has a first insertion groove and a second insertion groove at both ends. The inner cavity of the connecting sleeve is provided with a bearing groove, and a guide wheel is installed in the inner cavity of the bearing groove. The first insertion groove and the second insertion groove are respectively inserted into the insertion end and the socket end.

[0014] The auxiliary component includes an inner insulating layer and a heat-absorbing plate. An outer insulating layer is provided on the outer side of the heat-absorbing plate, and a rubber protective layer is provided on the outer side of the outer insulating layer. A heat-conducting rod is installed on the outer wall of the heat-absorbing plate, and the heat-conducting rod is connected to the heat dissipation plate.

[0015] As a preferred embodiment of the environmentally friendly PVC power sheathing pipe described in this invention, the insertion end and the socket end are interlocked, and two limiting platforms at the ends of the insertion end and the socket end are fixed by bolts.

[0016] As a preferred embodiment of the environmentally friendly PVC power sheathing pipe of the present invention, the limiting platform is specifically annular, and multiple fixing holes are evenly distributed on the limiting platform, and the inner wall is provided with threads.

[0017] As a preferred embodiment of the environmentally friendly PVC power sheathing pipe of the present invention, the bearing groove is specifically annular, and multiple guide wheels are provided, evenly distributed in the inner cavity of the bearing groove.

[0018] As a preferred embodiment of the environmentally friendly PVC power sheathing pipe described in this invention, the two end faces of the connecting sleeve are provided with mounting holes, the mounting holes are provided with threads, and the fixing bolts pass through the limiting platform and are threadedly connected to the mounting holes.

[0019] As a preferred embodiment of the environmentally friendly PVC power sheathing pipe of the present invention, the heat-absorbing plate is specifically arc-shaped and evenly distributed on the outer wall of the sheathing pipe, and the outer insulation layer fixes the heat-absorbing plate to the sheathing pipe.

[0020] In a preferred embodiment of the environmentally friendly PVC power sheathing pipe described in this invention, multiple heat-conducting rods are provided and evenly distributed on the heat-absorbing plate, and the heat-conducting rods pass through the outer insulation layer and are connected to the heat dissipation plate.

[0021] As a preferred embodiment of the environmentally friendly PVC power sheathing pipe of the present invention, the rubber protective layer is provided with a through-hole groove, and the heat dissipation plate is located in the inner cavity of the through-hole groove and its height is lower than that of the rubber protective layer.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. Significantly enhanced reliability of the connection structure

[0024] Dual fixing design: It adopts a dual fixing structure of "precise insertion of the insertion end and the socket end + bolt reinforcement". The pull-out force at the joint is ≥5kN, and the anti-settlement capacity is increased by more than 80%. It can effectively resist the risk of loosening caused by soil settlement, geological changes and external pressure.

[0025] Excellent sealing performance: The fluororubber O-ring is installed in the insertion groove of the connecting sleeve. With precise clearance fit, the sealing performance of the joint reaches IP68 level, which can effectively prevent rainwater and mud from seeping into the pipe. When used in areas with high groundwater level, the seepage rate is 0.

[0026] Easy and efficient installation: The connection structure is designed to be simple and requires no complicated tools. A single person can complete the docking and installation, which improves the installation efficiency by more than 60% compared with the traditional flange connection. At the same time, the bolt connection method facilitates disassembly and maintenance in the later stage, reducing maintenance costs.

[0027] 2. Significantly improved heat dissipation efficiency, extending cable life.

[0028] Integrated heat dissipation system: Constructs an integrated heat dissipation system consisting of "heat absorption plate for rapid heat absorption - copper heat conduction rod for efficient heat conduction - aluminum alloy heat dissipation plate for rapid heat dissipation", which improves heat dissipation efficiency by more than 150% compared with traditional PVC sheath pipes, and reduces the operating temperature of cables inside the sheath pipe by 20-30℃.

[0029] Strong heat dissipation stability: The heat dissipation components are firmly connected to the main body of the protective tube, and can still maintain good heat dissipation performance under working conditions such as vibration and impact. The heat dissipation efficiency will not decrease due to structural loosening. The heat dissipation plate is embedded in the rubber protective layer, which not only ensures the heat dissipation area, but also avoids damage from external forces, and the heat dissipation performance is stable in the long term.

[0030] Extended cable life: Through effective heat dissipation, the operating temperature of the cable insulation layer is controlled below 60℃, the aging rate is slowed down by more than 60%, and the cable life is extended from the traditional 15-20 years to 30-35 years, significantly reducing the replacement and maintenance costs of power engineering.

[0031] 3. Comprehensive upgrade in protection performance, adaptable to multiple application scenarios.

[0032] Multiple insulation protection: The double insulation design of inner and outer insulation layers has a total breakdown voltage of ≥45kV / mm. The insulation performance is more than 100% higher than that of traditional sheaths, which can effectively prevent leakage accidents and maintain good insulation performance in harsh environments such as humid and dusty environments.

[0033] Impact and wear resistant: The rubber protective layer is 12-15mm thick, with a Shore hardness of 65-70HA and an impact strength of ≥15kJ / m². It can withstand the impact of a 50mm diameter, 1kg hard object falling from a height of 1m without breaking. Its wear resistance reaches the T6 level in the GB / T16895.21-2011 standard, increasing its service life by more than 200%.

[0034] Strong corrosion resistance: The main body of the sheath and the connecting sleeve are made of environmentally friendly modified PVC composite material, and the surface of the auxiliary components is treated with anti-corrosion treatment (anodization, passivation, and welding protection). It can be used for a long time in corrosive environments such as acidic soil (pH value 3-5) and saline-alkali land (salt content ≤5%), with a corrosion rate ≤0.01mm / year. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0036] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0037] Figure 2 This is a schematic cross-sectional view of the overall structure of the present invention;

[0038] Figure 3 This is a schematic diagram of the three-dimensional structure of the sheath tube of the present invention;

[0039] Figure 4 This is a schematic diagram of the three-dimensional structure of the connecting sleeve of the present invention;

[0040] Figure 5 This is a schematic cross-sectional view of the sheath tube of the present invention;

[0041] Figure 6 This is a schematic diagram of the exploded structure of the auxiliary component of the present invention.

[0042] In the diagram: 100 sheath tube, 110 insertion end, 120 socket end, 130 limiting platform, 140 fixing hole, 150 fixing bolt, 200 connecting sleeve, 210 first insertion groove, 220 second insertion groove, 230 bearing groove, 240 guide wheel, 250 mounting hole, 300 auxiliary component, 310 inner insulation layer, 320 heat absorption plate, 330 heat conduction rod, 340 outer insulation layer, 350 heat dissipation plate, 360 rubber protective layer, 370 through hole groove. Detailed Implementation

[0043] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0044] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0045] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0046] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0047] This invention provides the following technical solution: an environmentally friendly PVC power sheathing pipe, which significantly enhances the reliability of the connection structure during use.

[0048] Dual fixing design: It adopts a dual fixing structure of "precise insertion of the insertion end and the socket end + bolt reinforcement". The pull-out force at the joint is ≥5kN, and the anti-settlement capacity is increased by more than 80%. It can effectively resist the risk of loosening caused by soil settlement, geological changes and external pressure.

[0049] Excellent sealing performance: The fluororubber O-ring is installed in the insertion groove of the connecting sleeve. With precise clearance fit, the sealing performance of the joint reaches IP68 level, which can effectively prevent rainwater and mud from seeping into the pipe. When used in areas with high groundwater level, the seepage rate is 0.

[0050] Easy and efficient installation: The connection structure is designed to be simple and requires no complicated tools. A single person can complete the docking and installation, which improves the installation efficiency by more than 60% compared with the traditional flange connection. At the same time, the bolt connection method facilitates disassembly and maintenance in the later stage, reducing maintenance costs.

[0051] Significantly improved heat dissipation efficiency and extended cable life.

[0052] Integrated heat dissipation system: Constructs an integrated heat dissipation system consisting of "heat absorption plate for rapid heat absorption - copper heat conduction rod for efficient heat conduction - aluminum alloy heat dissipation plate for rapid heat dissipation", which improves heat dissipation efficiency by more than 150% compared with traditional PVC sheath pipes, and reduces the operating temperature of cables inside the sheath pipe by 20-30℃.

[0053] Strong heat dissipation stability: The heat dissipation components are firmly connected to the main body of the protective tube, and can still maintain good heat dissipation performance under working conditions such as vibration and impact. The heat dissipation efficiency will not decrease due to structural loosening. The heat dissipation plate is embedded in the rubber protective layer, which not only ensures the heat dissipation area, but also avoids damage from external forces, and the heat dissipation performance is stable in the long term.

[0054] Extended cable life: Through effective heat dissipation, the operating temperature of the cable insulation layer is controlled below 60℃, the aging rate is slowed down by more than 60%, and the cable life is extended from the traditional 15-20 years to 30-35 years, significantly reducing the replacement and maintenance costs of power engineering.

[0055] Comprehensive upgrade in protection performance, adaptable to multiple application scenarios.

[0056] Multiple insulation protection: The double insulation design of inner and outer insulation layers has a total breakdown voltage of ≥45kV / mm. The insulation performance is more than 100% higher than that of traditional sheaths, which can effectively prevent leakage accidents and maintain good insulation performance in harsh environments such as humid and dusty environments.

[0057] Impact and wear resistant: The rubber protective layer is 12-15mm thick, with a Shore hardness of 65-70HA and an impact strength of ≥15kJ / m². It can withstand the impact of a 50mm diameter, 1kg hard object falling from a height of 1m without breaking. Its wear resistance reaches the T6 level in the GB / T16895.21-2011 standard, increasing its service life by more than 200%.

[0058] Strong corrosion resistance: The main body of the sheath and the connecting sleeve are made of environmentally friendly modified PVC composite material, and the surface of the auxiliary components is treated with anti-corrosion treatment (anodization, passivation, and welding protection). It can be used for a long time in corrosive environments such as acidic soil (pH value 3-5) and saline-alkali land (salt content ≤5%), with a corrosion rate ≤0.01mm / year.

[0059] Figures 1-3 The diagram shown is a structural schematic of the first embodiment of an environmentally friendly PVC power sheathing pipe according to the present invention. Please refer to [link / reference]. Figures 1-3 This embodiment of an environmentally friendly PVC power conduit includes, in its main body, the following components:

[0060] (I) Design of the main structure of the sheath pipe

[0061] The sheath tube 100 is made of environmentally friendly modified PVC composite material, and its formula consists of the following components by weight: 100 parts halogen-free flame-retardant PVC resin, 25-30 parts environmentally friendly plasticizer (tributyl citrate), 8-12 parts nano-calcium carbonate filler, 1.5-2.0 parts anti-aging agent (2,6-di-tert-butyl-p-cresol), 0.8-1.2 parts ultraviolet absorber (UV-531), 1.0-1.5 parts lubricant (calcium stearate), and 3-5 parts compatibilizer (maleic anhydride-grafted polyethylene). This formula, by replacing traditional halogen-containing resins with halogen-free flame-retardant resin, combined with environmentally friendly plasticizers and anti-aging agents, achieves a halogen content ≤0.1% and a smoke density rating (SDR) ≤45, complying with EU RoHS and REACH environmental standards, and is 100% recyclable and reprocessable after disposal.

[0062] The main body of the sheath tube 100 is a cylindrical hollow structure, with an insertion end 110 and a socket end 120 integrally formed at both ends by extrusion molding. The outer diameter of the insertion end 110 and the inner diameter of the socket end 120 are clearance fit, with the fit tolerance controlled within ±0.2mm, to ensure accurate positioning when adjacent sheath tubes 100 are connected. The length of the insertion end 110 is designed to be 55-60mm, and the length of the socket end 120 is designed to be 65-70mm. The insertion depth of the insertion end 110 into the socket end 120 is not less than 50mm to ensure the structural stability after connection. Both the insertion end 110 and the socket end 120 have an integrally formed annular limiting platform 130. The limiting platform 130 has a width of 20-25mm and a thickness of 6-8mm. The limiting platform 130 has 4-6 fixing holes 140 evenly opened along the circumferential direction. The diameter of the fixing holes 140 is 8-10mm, and the inner wall is provided with fine threads of M8-M10, which are used to cooperate with the fixing bolts 150 to achieve double reinforcement.

[0063] (II) Design of connecting sleeve structure

[0064] The connecting sleeve 200 is made of environmentally friendly modified PVC composite material, the same as the main body of the sheath 100. Its length is 130-150mm, and its inner diameter is a transition fit with the outer diameter of the sheath 100, with a tolerance of ±0.3mm. The connecting sleeve 200 has a first insertion groove 210 and a second insertion groove 220 axially formed at both ends. The first insertion groove 210 has a depth of 35-40mm, and an annular sealing groove is provided on the inner side of the groove wall. An O-ring (made of fluororubber, with a temperature range of -20℃ to 120℃) is embedded in the sealing groove to enhance the sealing performance between the insertion end 110 and the connecting sleeve 200. The second insertion groove 220 has a depth of 40-45mm, and its groove wall structure is the same as that of the first insertion groove 210, ensuring a tight seal between the socket end 120 and the connecting sleeve 200.

[0065] An annular bearing groove 230 is formed in the center of the inner cavity of the connecting sleeve 200 along the circumferential direction. The bearing groove 230 is 25-30mm wide and 10-12mm deep. Six to eight guide wheels 240 are rotatably mounted within the bearing groove 230 via a rotating shaft. The guide wheels 240 are evenly distributed at equal angles (the included angle between adjacent guide wheels 240 is 45°-60°). The guide wheels 240 are made of reinforced nylon 66 material (with 15% glass fiber added), with a diameter of 18-20mm and a thickness of 8-10mm. A miniature deep groove ball bearing (model 625ZZ) is installed between the rotating shaft and the guide wheel 240 to ensure the flexible rotation of the guide wheel 240, converting the sliding friction during cable insertion into rolling friction, reducing friction by more than 60%.

[0066] The two end faces of the connecting sleeve 200 are provided with mounting holes 250 along the circumferential direction, corresponding one-to-one with the fixing holes 140 of the limiting platform 130. The diameter and thread specifications of the mounting holes 250 are the same as those of the fixing holes 140, and the depth of the mounting holes 250 is 15-20mm. The fixing bolts 150 are made of 304 stainless steel (the surface is passivated, and the corrosion resistance level reaches C4 level), with specifications of M8×40mm or M10×45mm, and are equipped with flat washers, spring washers and lock nuts. The bolts are threaded through the fixing holes 140 of the limiting platform 130 and the mounting holes 250 of the connecting sleeve 200 to achieve double fixation of the main body of the sheath tube 100 and the connecting sleeve 200. The pull-out force is ≥5kN, ensuring that it will not loosen or fall off under conditions such as soil settlement and external extrusion.

[0067] (III) Design of Auxiliary Protective Heat Dissipation Components

[0068] The auxiliary protective heat dissipation component includes an inner insulation layer 310, a heat absorption plate 320, an outer insulation layer 340, a rubber protective layer 360, a heat-conducting rod 330, and a heat dissipation plate 350. Each layer is wrapped around the outer wall of the sheath tube 100 body from the inside out, forming an integrated structure of "insulation-heat absorption-heat conduction-heat dissipation-protection".

[0069] Inner insulation layer 310: It is tightly bonded to the inner wall of the sheath tube 100 body, made of environmentally friendly nitrile rubber (with added flame retardants and anti-aging agents), with a thickness of 3-4mm, a Shore hardness of 55-60HA, a temperature range of -30℃ to 90℃, and a breakdown voltage ≥25kV / mm. It effectively enhances the insulation performance of the sheath tube 100 and prevents the risk of leakage between the cable and the tube body. The inner insulation layer 310 is bonded to the inner wall of the sheath tube 100 by hot pressing molding process, with a bonding strength ≥1.2MPa and no defects such as bubbles or wrinkles.

[0070] Heat absorber plate 320: Made of high thermal conductivity aluminum foil (purity ≥99.5%), formed into an arc shape by stamping. The radius of the arc is consistent with the outer diameter of the sheath tube 100 body, ensuring a tight fit with the outer wall of the sheath tube 100. The thickness of the heat absorber plate 320 is 2.5-3mm, and the width is 80-100mm. It is evenly distributed along the axial direction of the sheath tube 100 body, with a spacing of 150-200mm between adjacent heat absorber plates 320. The total coverage area accounts for 60%-70% of the outer wall area of ​​the sheath tube 100, ensuring rapid absorption of heat generated by the cable operation. The surface of the heat absorber plate 320 is anodized, with an oxide film thickness ≥10μm, enhancing corrosion resistance and heat absorption efficiency.

[0071] Outer insulation layer 340: Wrapped around the outside of the heat absorber plate 320, it is made of environmentally friendly modified PVC insulation material with a thickness of 4-5mm. The formula includes UV stabilizers and flame retardants, with a breakdown voltage ≥20kV / mm and excellent weather resistance. It effectively blocks external environmental corrosion of the heat absorber plate 320 and the main body of the sheath tube 100, while firmly fixing the heat absorber plate 320 to the outer wall of the sheath tube 100. The outer insulation layer 340 is bonded to the main body of the sheath tube 100 and the heat absorber plate 320 using environmentally friendly polyurethane adhesive with a bonding strength ≥1.0MPa. The adhesive does not contain formaldehyde, benzene, or other harmful substances and complies with the GB18583-2008 standard.

[0072] Rubber protective layer 360: Located on the outside of the outer insulation layer 340, it is made of wear-resistant styrene-butadiene rubber (with added carbon black reinforcing agent and anti-aging agent), with a thickness of 12-15mm, a Shore hardness of 65-70HA, a tensile strength ≥15MPa, and an elongation at break ≥400%, possessing excellent impact resistance, wear resistance, and corrosion resistance. A rectangular through-hole groove 370, adapted to the heat sink 350, is formed along the axial direction of the sheath tube 100 on the rubber protective layer 360. The depth of the through-hole groove 370 is 8-10mm, and its width is 2-3mm larger than that of the heat sink 350, used to accommodate the heat sink 350 and prevent direct impact from external forces.

[0073] Heat-conducting rod 330: Made of oxygen-free copper (thermal conductivity ≥380W / (m·K)) through a stretching process, with a diameter of 5-6mm. Its length is adapted to the total thickness of the outer insulation layer 340 and the rubber protective layer 360 (ensuring one end connects to the heat absorber plate 320 and the other end connects to the heat dissipation plate 350). 4-6 heat-conducting rods 330 are evenly installed axially on each heat absorber plate 320. One end of the heat-conducting rod 330 is welded to the heat absorber plate 320 using silver brazing, with the welding temperature controlled at 600-650℃. The weld joint is free of incomplete or missing welds, and the thermal contact resistance is ≤0.01Ω. The other end of the heat-conducting rod 330 passes through a pre-drilled hole in the outer insulation layer 340 and is welded to the heat dissipation plate 350.

[0074] Heat sink 350: Made of 6063 aluminum alloy (thermal conductivity ≥200W / (m·K)), it is formed into a rectangular structure by extrusion molding, with a length of 70-90mm, a width of 50-60mm, and a thickness of 6-8mm. The heat sink 350 is embedded in the bearing groove 230 of the rubber protective layer 360, with a distance of 2-3mm between its outer surface and the outer surface of the rubber protective layer 360. This ensures sufficient contact between the heat sink 350 and the air while preventing damage from direct impact from external hard objects. The surface of the heat sink 350 is sandblasted to increase the heat dissipation area and improve heat dissipation efficiency.

[0075] (iv) Assembly process optimization

[0076] Preparation of the main body of the sheath tube 100: The components of the environmentally friendly modified PVC composite material are mixed evenly in proportion and extruded through a twin-screw extruder. The extrusion temperature is controlled at 160-180℃, the screw speed is 30-50r / min, and the cooling water temperature is 20-30℃ to ensure that the tube surface is smooth and the dimensional accuracy meets the standards. After extrusion molding, the insertion end 110, the socket end 120 and the limiting stage 130 at both ends are processed by a special machine tool. The fixing hole 140 is processed by a drilling and tapping machine, and the thread accuracy reaches 6H grade.

[0077] Auxiliary component 300 assembly:

[0078] Inner insulation layer 310 assembly: Fix the main body of the sheath tube 100 on a special tooling table, and tightly bond the inner insulation layer 310 roll material preheated to 80-90℃ to the inner wall of the sheath tube 100 through a hot press roller. The hot press pressure is 0.3-0.5MPa. After bonding, allow it to cool naturally to room temperature.

[0079] Heat absorber plate 320 assembly: The anodized heat absorber plate 320 is evenly attached to the outer wall of the sheath tube 100 and fixed in position by positioning fixture. Then, a thin layer of environmentally friendly adhesive is applied between the heat absorber plate 320 and the outer wall of the sheath tube 100 to ensure tight adhesion.

[0080] Outer insulation layer 340 assembly: The outer insulation layer 340 material is wrapped around the outside of the heat absorber plate 320 through an extruder at an extrusion temperature of 150-170℃. After wrapping, it is cooled and shaped by a cooling water tank to ensure that the outer insulation layer 340 is tightly bonded to the heat absorber plate 320 and the main body of the sheath tube 100.

[0081] Assembly of heat-conducting rod 330 and heat sink 350: Mark the installation position of heat-conducting rod 330 on heat absorber plate 320, drill a hole (the hole diameter is 0.1-0.2mm smaller than the diameter of heat-conducting rod 330) with a drilling machine, then insert one end of heat-conducting rod 330 into the hole and fix it with silver brazing process; weld heat sink 350 to the other end of heat-conducting rod 330, then open bearing groove 230 on rubber protective layer 360, fix rubber protective layer 360 to the outside of outer insulation layer 340 with adhesive, and ensure that heat sink 350 is embedded in through hole groove 370.

[0082] Assembly of connecting sleeve 200: The guide wheel 240 is installed in the bearing groove 230 of the connecting sleeve 200 through the rotating shaft to ensure that the guide wheel 240 rotates flexibly; O-rings are embedded in the sealing grooves of the first insertion groove 210 and the second insertion groove 220 to complete the pretreatment of the connecting sleeve 200.

[0083] Combination Figures 1-3 The complete assembly process of an environmentally friendly PVC power conduit 100 according to this embodiment is as follows:

[0084] (I) Production of the main body of the sheath pipe

[0085] Raw material mixing: Weigh out the halogen-free flame-retardant PVC resin, environmentally friendly plasticizer, nano calcium carbonate filler, anti-aging agent, ultraviolet absorber, lubricant and compatibilizer according to the formula ratio, put them into a high-speed mixer, and mix for 15-20 minutes at 80-90℃ and 800-1000r / min to ensure that each component is evenly dispersed.

[0086] Extrusion molding: The uniformly mixed raw materials are fed into a twin-screw extruder, and the extrusion temperature is set as follows: 160℃ for zone 1 of the barrel, 170℃ for zone 2, 175℃ for zone 3, and 180℃ for the die head. The screw speed is 40r / min. The extruded tube is then extruded through a special die. The extruded tube enters a cooling water tank (water temperature 25℃) for cooling and shaping. The traction speed is controlled at 1.5-2m / min.

[0087] End processing: After cooling and shaping, the tube body is cut into standard lengths of 6m / piece, and then fixed on a special machine tool to process the insertion end 110, the socket end 120 and the limiting platform 130 at both ends. The fixing hole 140 on the limiting platform 130 is processed by a drilling and tapping machine to ensure thread accuracy and uniform hole distribution.

[0088] Quality inspection: Inspect the dimensional accuracy (inner diameter, outer diameter, wall thickness tolerance), appearance (no cracks, bubbles, dents) and environmental performance (halogen content, smoke density) of the tube body. Qualified products will proceed to the next process.

[0089] (ii) Assembly of auxiliary components

[0090] Inner insulation layer 310 assembly:

[0091] Fix the main body of the sheath tube 100 horizontally on a special tooling table and clean the inner wall of impurities and dust;

[0092] The environmentally friendly nitrile rubber inner insulation layer 310 roll is preheated to 85°C and tightly bonded to the inner wall of the sheath tube 100 along the axial direction using a hot press roller. The hot press pressure is 0.4MPa, and air bubbles are removed during the bonding process using a pressure roller.

[0093] After bonding, allow it to cool naturally to room temperature, and trim off any excess inner insulation layer 310 at both ends to ensure that the inner insulation layer 310 is flush with the end of the sheath tube 100.

[0094] Heat absorber plate 320 assembly:

[0095] Clean the oil and impurities from the outer wall of the main body of the sheath tube 100, and lightly sand the surface with sandpaper to enhance the adhesion.

[0096] Mark the installation positions of the heat absorber plate 320 on the outer wall of the sheath tube 100 at intervals of 180mm, attach the anodized heat absorber plate 320 to the marked positions, and fix it with positioning fixtures.

[0097] Apply a thin layer of environmentally friendly polyurethane adhesive (0.2-0.3 mm thick) evenly between the heat absorber plate 320 and the outer wall of the sheath tube 100, and let it stand to cure for 24 hours to ensure a firm bond.

[0098] Outer insulation layer 340 assembly:

[0099] The main body of the sheath tube 100 with the heat absorber plate 320 assembled is fed into the extruder. The environmentally friendly modified PVC outer insulation layer 340 material is wrapped around the outside of the heat absorber plate 320 through a special mold. The extrusion temperature is set to 160℃ and the traction speed is 1m / min.

[0100] After being wrapped, the tube is placed in a cooling water tank (water temperature 25℃) to cool and set, ensuring that the outer insulation layer 340 has a smooth surface without cracks and is tightly bonded to the heat absorber plate 320 and the main body of the sheath tube 100.

[0101] Assemble the heat-conducting rod 330 with the heat sink 350:

[0102] Mark the installation positions of four heat-conducting rods 330 along the axial direction on each heat absorber plate 320 (spaced 20mm apart), and drill holes (5.4mm diameter, 2.5mm depth) using a drilling machine.

[0103] Insert one end of the oxygen-free copper heat-conducting rod 330 into the drilled hole and fix it by silver brazing. The welding temperature is 620℃ and the welding time is 3-5 seconds. After welding, clean the welding slag and check for any false welds or missing welds.

[0104] Apply silver solder to the other end of the heat-conducting rod 330, align the 6063 aluminum alloy heat sink 350 (sandblasted) with the heat-conducting rod 330, and weld it in place to ensure that the heat sink 350 is placed horizontally.

[0105] A rectangular through-hole groove 370 (9mm deep, 58mm wide) is made on the rubber protective layer 360 at the position of the heat sink 350. The surface of the outer insulation layer 340 is cleaned, and environmentally friendly polyurethane adhesive is evenly applied. The rubber protective layer 360 is attached to the outside of the outer insulation layer 340, ensuring that the heat sink 350 is embedded in the through-hole groove 370. Let it stand and cure for 24 hours.

[0106] (III) Assembly of connecting sleeves

[0107] Installation of guide wheel 240: Clean the inner cavity of connecting sleeve 200 and bearing groove 230 of impurities, embed the miniature deep groove ball bearing into the inner hole of guide wheel 240, and then install guide wheel 240 in bearing groove 230 through the rotating shaft to ensure that guide wheel 240 rotates flexibly (rotation resistance ≤0.5N).

[0108] Sealing groove processing: A ring-shaped sealing groove (4mm wide and 3mm deep) is processed on the inner wall of the first insertion groove 210 and the second insertion groove 220 at both ends of the connecting sleeve 200. Iron filings and impurities in the sealing groove are cleaned.

[0109] O-ring installation: Embed the fluororubber O-ring into the sealing groove, ensuring that the O-ring fits tightly with the sealing groove without twisting or deformation.

[0110] (iv) Installation of sheath pipe

[0111] Construction preparation: Clean the impurities and dust from the ends (insertion end 110 and socket end 120) of the two sheath tubes 100 to be connected, and check whether the threads of the fixing hole 140 of the limit platform 130 and the mounting hole 250 of the connecting sleeve 200 are intact.

[0112] Preliminary docking: Align the insertion end 110 of one sheath tube 100 with the socket end 120 of the other sheath tube 100, and slowly insert it until the two limiting platforms 130 are tightly fitted, ensuring an insertion depth ≥ 50mm.

[0113] Installation of connecting sleeve 200: Place the connecting sleeve 200, which is equipped with guide wheel 240 and O-ring seal, onto the mating joint, so that the insertion end 110 is inserted into the first insertion groove 210 of the connecting sleeve 200 and the socket end 120 is inserted into the second insertion groove 220, ensuring that the limiting platform 130 is in close contact with the end face of the connecting sleeve 200.

[0114] Bolt fixing: Pass the 304 stainless steel fixing bolt 150 (with matching flat washer and spring washer) through the fixing hole 140 of the limit platform 130 and thread it into the mounting hole 250 of the connecting sleeve 200. Tighten it with a torque wrench to a torque of 18 N·m, and then install the anti-loosening nut to ensure that the bolt is not loose.

[0115] Sealing inspection: Apply soapy water to the joint and observe whether bubbles are generated. If no bubbles are generated, the seal is good. If bubbles are generated, readjust the position of the connecting sleeve 200 and tighten the bolts until the seal is qualified.

[0116] (v) Cable installation operation

[0117] Cable preparation: Clean impurities and dust from inside the sheath 100, and check whether the guide wheel 240 inside the connecting sleeve 200 rotates flexibly; put a nylon protective sleeve on the cable end (to avoid scratching the cable sheath during cable pulling).

[0118] Cable threading operation: Insert one end of the cable into one end of the sheath 100, and use the guide wheel 240 inside the connecting sleeve 200 to reduce friction by rolling. Manually push the cable slowly, controlling the pushing speed at 0.5-1m / min, and avoid violent dragging.

[0119] Position adjustment: After pushing the cable to the designated position, check whether the cable sheath is damaged. If there is any damage, repair it in time. Adjust the position of the sheath tube 100 to ensure that the cable is not excessively bent inside the tube (bending radius ≥ 10 times the nominal diameter of the cable).

[0120] End sealing: Install sealing plugs at both ends of the sheath 100 to prevent rainwater and impurities from entering the pipe and complete the cable installation.

[0121] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, as long as there is no structural conflict, the features in the disclosed embodiments can be combined with each other in any manner. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An environment-friendly PVC power sheath pipe, characterized in that: Includes a sheath tube (100), on which a connecting sleeve (200) and an auxiliary component (300) are mounted. The sheath tube (100) is provided with an insertion end (110) and a socket end (120) at both ends respectively. A limiting platform (130) is provided at the end of the insertion end (110) and the socket end (120). A fixing hole (140) is provided on the limiting platform (130). The connecting sleeve (200) has a first insertion groove (210) and a second insertion groove (220) at both ends. The inner cavity of the connecting sleeve (200) is provided with a bearing groove (230). A guide wheel (240) is installed in the inner cavity of the bearing groove (230). The first insertion groove (210) and the second insertion groove (220) are respectively inserted into the insertion end (110) and the socket end (120). The auxiliary component (300) includes an inner insulating layer (310) and a heat-absorbing plate (320). An outer insulating layer (340) is provided on the outer side of the heat-absorbing plate (320), and a rubber protective layer (360) is provided on the outer side of the outer insulating layer (340). A heat-conducting rod (330) is installed on the outer wall of the heat-absorbing plate (320), and the heat-conducting rod (330) is connected to the heat dissipation plate (350).

2. The environmentally friendly PVC power sheathing pipe (100) according to claim 1, characterized in that: The insertion end (110) and the socket end (120) are inserted into each other, and the two limiting platforms (130) at the ends of the insertion end (110) and the socket end (120) are fixed by bolts.

3. The environmentally friendly PVC power sheathing pipe (100) according to claim 1, characterized in that: The limiting platform (130) is specifically annular, and multiple fixing holes (140) are provided, which are evenly distributed on the limiting platform (130), and the inner wall is provided with threads.

4. The environmentally friendly PVC power sheathing pipe (100) according to claim 1, characterized in that: The bearing groove (230) is specifically annular, and multiple guide wheels (240) are provided, evenly distributed in the inner cavity of the bearing groove (230).

5. The environmentally friendly PVC power sheathing pipe (100) according to claim 1, characterized in that: The connecting sleeve (200) has mounting holes (250) on both end faces. The mounting holes (250) are threaded, and the fixing bolts (150) pass through the limiting platform (130) and are threadedly connected to the mounting holes (250).

6. The environmentally friendly PVC power sheathing pipe (100) according to claim 1, characterized in that: The heat-absorbing plate (320) has an arc-shaped structure and is evenly distributed on the outer wall of the sheath tube (100). The outer insulation layer (340) fixes the heat-absorbing plate (320) on the sheath tube (100).

7. The environmentally friendly PVC power sheathing pipe (100) according to claim 1, characterized in that: Multiple heat-conducting rods (330) are provided and are evenly distributed on the heat-absorbing plate (320), and the heat-conducting rods (330) pass through the outer insulation layer (340) and are connected to the heat dissipation plate (350).

8. The environmentally friendly PVC power sheathing pipe (100) according to claim 1, characterized in that: The rubber protective layer (360) has a through-hole groove (370), and the heat dissipation plate (350) is located in the inner cavity of the through-hole groove (370) and its height is lower than that of the rubber protective layer (360).

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