Polyurethane sleeve of new energy automobile wire harness

Abstract

The invention relates to the technical field of cable sleeves, and discloses a polyurethane sleeve of a new energy automobile wire harness, and the polyurethane sleeve arranged on a cable is obtained through sequential connection and combination of an end side sleeve link and a middle sleeve link. Each sleeve link of the polyurethane sleeve is provided with an insulation protection layer, a polyurethane enhancement layer and an outer protection layer which are sequentially nested from inside to outside, the outer protection layer is made of a light-transmitting material, and the polyurethane enhancement layer is formed by orderly weaving a plurality of polyurethane strips which are polymerized into strip shapes. Polyurethane in the polyurethane enhancement layer is coated with the ultraviolet fluorescent coating, the ultraviolet fluorescent coating has the function of uniform color development under the irradiation of an ultraviolet lamp, and the function of uniform color development of the ultraviolet fluorescent coating under the irradiation of the ultraviolet lamp can be influenced by structural flaws of polyurethane; and when flaws are detected, only corresponding sleeve links need to be replaced, so that the problem that the maintenance cost of the cable sleeve is relatively high in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cable bushings, and in particular to a polyurethane bushing for a wiring harness of a new energy vehicle. Background Art

[0002] The electrical system of new energy vehicles usually works in a high-voltage environment, and the protection requirements for the wiring harness are very high. Especially in high-voltage environments, traditional sleeves cannot provide sufficient mechanical strength and electrical insulation, and are prone to failure or damage. Therefore, sleeves with polyurethane reinforcement layers are required. Since the wiring harnesses of new energy vehicles need to work in extreme temperatures, humidity, vibration and other environments, the performance requirements of the sleeve materials are very high. The sleeve needs to be repaired and replaced after defects occur in the working environment. The cost of repairing and replacing a sleeve with defects somewhere is relatively high, resulting in a waste of costs. Summary of the invention

[0003] The purpose of the present invention is to provide a polyurethane sleeve for a new energy vehicle wiring harness, aiming to solve the problem of high maintenance cost of cable sleeves in the prior art.

[0004] The present invention is implemented in this way. The present invention provides a polyurethane sleeve for a new energy vehicle wiring harness, comprising: It is composed of a plurality of polyurethane sleeve links that can be connected to each other, wherein the polyurethane sleeve links include end sleeve links and middle sleeve links, wherein the end sleeve links are arranged at both ends of the wiring harness that need to be protected in the automobile, and the middle sleeve link is arranged at a position between the two ends of the wiring harness; The intermediate sleeve link comprises an intermediate sleeve portion and an intermediate connecting portion, wherein the intermediate connecting portion is arranged at both ends of the intermediate sleeve portion, and each intermediate sleeve link is fixedly connected to each other through the intermediate connecting portion; The end-side sleeve link includes an end-side sleeve portion, an end-side connecting portion and an end-side mounting portion, the end-side connecting portion and the end-side mounting portion are respectively arranged at two ends of the end-side sleeve portion, the end-side sleeve link is arranged at the end of the wiring harness that needs to be protected inside the vehicle through the end-side mounting portion, and the end-side sleeve link is fixedly connected to the middle connecting portion of the middle sleeve link through the end-side connecting portion; The middle sleeve part of the middle sleeve link and the end sleeve part of the end sleeve link both have an insulating protective layer, a polyurethane reinforcement layer, and an outer protective layer which are nested in sequence from the inside to the outside; The outer protective layer is made of a light-transmitting material, the polyurethane reinforcement layer is composed of a plurality of polyurethane strips polymerized into strips and woven in an orderly manner, and the polyurethane in the polyurethane reinforcement layer is coated with an ultraviolet fluorescent coating, and the ultraviolet fluorescent coating has the function of uniformly displaying color under ultraviolet light, and the function of uniformly displaying color under ultraviolet light will be affected by structural defects of polyurethane.

[0005] Preferably, the middle connecting portion and the end connecting portion both include a sliding nesting joint, a fixing buckle and an outer sealing ring; The sliding nested joints have the function of being inserted into each other and fixed, and the fixing buckles have the function of locking and fixing; The outer sealing ring detachable outer cover is arranged on the middle sleeve part to seal and protect the connection position between the middle sleeve part and the rest of the structure.

[0006] Preferably, positions on the middle sleeve portion and the end sleeve portion prepared for arranging the outer sealing ring have embedding grooves, and the embedding grooves are used for maintaining the outer sealing ring and the middle sleeve portion in a tightly embedded state.

[0007] Preferably, the outer sealing ring comprises a silicone base and a fluorinated polymer coating.

[0008] Preferably, the middle sleeve portion and the end sleeve portion both have a first separation sleeve and a second separation sleeve, the first separation sleeve and the second separation sleeve have a staggered interlocking structure, and the first separation sleeve and the second separation sleeve are detachably closed and installed through the staggered interlocking structure; The insulating protective layer, the polyurethane reinforcement layer, and the outer protective layer of the middle sleeve part and the end side sleeve part are separately arranged in the first separation sleeve and the second separation sleeve.

[0009] Preferably, the staggered interlocking structure is arranged on the outer protective layer of the first separation sleeve and the second separation sleeve, and the staggered interlocking structure of the outer protective layer of the first separation sleeve and the second separation sleeve includes at least two levels, and the staggered interlocking positions of the two levels are different.

[0010] Preferably, the staggered interlocking structure comprises recessed portions and raised portions arranged in sequence; The edges of the recessed portion and the raised portion have a certain inclination, and the inclination of the recessed portion and the inclination of the raised portion match each other to achieve a tight fit between the recessed portion and the raised portion.

[0011] The present invention provides a polyurethane sleeve for a new energy vehicle wiring harness, which has the following beneficial effects: The present invention obtains a polyurethane sleeve arranged on a cable by sequentially connecting and combining an end sleeve link and an intermediate sleeve link. Each sleeve link of the polyurethane sleeve has an insulating protective layer, a polyurethane reinforcement layer, and an outer protective layer which are sequentially nested from the inside to the outside. The outer protective layer is a light-transmitting material. The polyurethane reinforcement layer is composed of a plurality of polyurethane strips polymerized into strips and woven in an orderly manner. The polyurethane in the polyurethane reinforcement layer is coated with an ultraviolet fluorescent coating. The ultraviolet fluorescent coating has the function of uniform color display under ultraviolet lamp irradiation. The function of uniform color display under ultraviolet lamp irradiation of the ultraviolet fluorescent coating will be affected by structural defects of the polyurethane. When defects are detected, only the corresponding sleeve link needs to be replaced, thereby solving the problem of high maintenance cost of the cable sleeve in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of a polyurethane sleeve of a new energy vehicle wiring harness provided by an embodiment of the present invention; Reference numerals: 1 - insulating protective layer, 2 - polyurethane reinforcing layer, 3 - outer protective layer. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0014] The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0015] Reference Figure 1 As shown, a preferred embodiment of the present invention is provided.

[0016] The present invention provides a polyurethane sleeve for a new energy vehicle wiring harness, which is composed of a plurality of polyurethane sleeve links that can be connected to each other. The polyurethane sleeve links include end sleeve links and middle sleeve links. The end sleeve links are arranged at the two ends of the wiring harness that need to be protected in the automobile, and the middle sleeve link is arranged at a position between the two ends of the wiring harness.

[0017] It can be understood that the sleeve provided by the technical solution of the present invention adopts a multi-section structure connected in sequence, and the spliced ​​unit includes two end sleeve links and a plurality of intermediate sleeve links. The end sleeve link is arranged at both ends of the wiring harness and abuts against the car body, and the intermediate sleeve link is arranged between the two end sleeve links and connected in sequence.

[0018] Specifically, the intermediate sleeve link includes an intermediate sleeve part and an intermediate connecting part, the intermediate connecting part is arranged at both ends of the intermediate sleeve part, and each intermediate sleeve link is fixedly connected to each other through the intermediate connecting part; the end side sleeve link includes an end side sleeve part, an end side connecting part and an end side installation part, the end side connecting part and the end side installation part are respectively arranged at both ends of the end side sleeve part, the end side sleeve link is arranged at the end of the wiring harness that needs to be protected inside the car through the end side installation part, and the end side sleeve link is fixedly connected to each other through the end side connecting part and the intermediate connecting part of the intermediate sleeve link.

[0019] It can be seen that the middle sleeve link and the end side sleeve link have certain similarities in structure. The main difference lies in that both ends of the middle sleeve part in the middle sleeve link are middle connecting parts, while the two ends of the end side connecting link are the end side connecting part and the end side installation part respectively.

[0020] Furthermore, the function performed by the end side connecting part of the end side sleeve link is consistent with the function performed by the middle connecting part of the middle sleeve link, and the end side mounting part of the end side sleeve link is used to fix the end side sleeve part on the automobile body, thereby achieving full coverage of the wiring harness.

[0021] More specifically, the middle sleeve part of the middle sleeve link and the end sleeve part of the end sleeve link both have an insulating protective layer, a polyurethane reinforcement layer, and an outer protective layer which are nested in sequence from the inside to the outside.

[0022] It should be noted that the insulating protective layer is attached to the innermost layer of the wiring harness. Its function is to insulate the wiring harness, prevent electrical contact between internal cables or between cables and the outside world, protect the wiring harness from internal friction and wear, provide a certain buffering effect, and ensure the safety and stability of the wiring harness in high temperature and high pressure environments.

[0023] More specifically, the polyurethane reinforcement layer provides the main mechanical strength and rigidity, ensuring that the casing can withstand external mechanical stress and high pressure. Polyurethane has excellent mechanical properties and high temperature resistance. The polyurethane reinforcement layer composed of polyurethane can effectively disperse and resist external impact and pressure.

[0024] More specifically, the outer protective layer provides external physical protection against abrasion, chemical corrosion, and environmental factors (such as UV rays, moisture, etc.).

[0025] Furthermore, the outer protective layer is made of a light-transmitting material, the polyurethane reinforcement layer is composed of a plurality of polyurethane strips polymerized into strips and woven in an orderly manner, and the polyurethane coating in the polyurethane reinforcement layer is provided with an ultraviolet fluorescent coating, and the ultraviolet fluorescent coating has the function of uniformly displaying color under ultraviolet light, and the function of uniformly displaying color under ultraviolet light will be affected by structural defects of the polyurethane.

[0026] It should be noted that by coating the UV fluorescent coating on the orderly woven polyurethane, the UV fluorescent coating can be in a color-developing state under the irradiation of UV lamp, and the color-developing effect of the UV fluorescent coating is related to the structural integrity of the polyurethane. When the polyurethane has small cracks that are difficult to observe, the uniformity of the UV fluorescent coating coated on the polyurethane will be destroyed, making it impossible to perform uniform fluorescent color development under the irradiation of UV lamp, and the color-developing effect at the location where the small cracks that are difficult to observe appear will show a more obvious difference, thereby identifying whether the polyurethane has potential hidden dangers.

[0027] More specifically, since the outer protective layer is made of transparent material, an ultraviolet lamp can be used to irradiate the polyurethane sleeve, so that the ultraviolet fluorescent coating in the polyurethane reinforcement layer receives ultraviolet radiation for fluorescent coloring, thereby detecting tiny defects in the orderly woven polyurethane in the polyurethane reinforcement layer.

[0028] It can be understood that after testing the polyurethane with an ultraviolet lamp, it can be confirmed whether there is defective polyurethane in the end sleeve link and the middle sleeve link. Furthermore, the type and degree of defects in the polyurethane at this location can be judged by the abnormal degree of fluorescence color development of the ultraviolet fluorescent coating under ultraviolet lamp, and then decide how to perform subsequent processing.

[0029] Furthermore, since the technical solution of the present invention adopts a multi-segment structure to construct the polyurethane sleeve of the wiring harness, when the polyurethane in a certain link is defective, the link can be replaced, thereby achieving efficient maintenance and controlling maintenance costs.

[0030] The present invention provides a polyurethane sleeve for a new energy vehicle wiring harness, which has the following beneficial effects: The present invention obtains a polyurethane sleeve arranged on a cable by sequentially connecting and combining an end sleeve link and an intermediate sleeve link. Each sleeve link of the polyurethane sleeve has an insulating protective layer, a polyurethane reinforcement layer, and an outer protective layer which are sequentially nested from the inside to the outside. The outer protective layer is a light-transmitting material. The polyurethane reinforcement layer is composed of a plurality of polyurethane strips polymerized into strips and woven in an orderly manner. The polyurethane in the polyurethane reinforcement layer is coated with an ultraviolet fluorescent coating. The ultraviolet fluorescent coating has the function of uniform color display under ultraviolet lamp irradiation. The function of uniform color display under ultraviolet lamp irradiation of the ultraviolet fluorescent coating will be affected by structural defects of the polyurethane. When defects are detected, only the corresponding sleeve link needs to be replaced, thereby solving the problem of high maintenance cost of the cable sleeve in the prior art.

[0031] Preferably, the middle connecting part and the end connecting part both include a sliding nesting joint, a fixing buckle and an outer sealing ring.

[0032] Specifically, the sliding nested joints have the function of being inserted and fixed to each other, and the fixing buckles have the function of locking and fixing; the removable outer sleeve of the outer sealing ring is arranged on the middle sleeve part to seal and protect the connection position between the middle sleeve part and the remaining structure.

[0033] More specifically, the sliding nesting joint is a concave-convex structure. The sliding nesting joint can be brought into close contact with another sliding nesting joint to achieve shape fit between the two. The sliding nesting joint can provide a stable connection when connected. The two parts are connected and fixed by nesting with each other to prevent relative sliding or loosening. The joint can be easily disassembled and reinstalled by sliding without the need for additional tools or complicated operations.

[0034] More specifically, the fixed buckle can be divided into a fixed part and a variable buckling part. When the sliding nesting interfaces are connected to each other, the buckling part can be driven to buckle with the fixed part to strengthen the connection stability of the two connecting parts.

[0035] It should be noted that the fixing buckles on one connecting part exist in groups, that is, they have at least one fixing portion and a buckling portion, the fixing portion is used for buckling with the buckling portion of another connecting part, and the buckling portion is used for buckling with the fixing portion of another connecting part.

[0036] More specifically, the outer sealing ring is an annular seal, usually made of elastic rubber, silicone, polyurethane and other materials. It can completely cover the joint part that needs to be sealed, and different sealing ring thickness and hardness can be selected according to the different connection positions. The main function of the outer sealing ring is to prevent moisture, dust or other external contaminants from entering the connection part, to avoid corrosion or wear of the joint parts due to external environmental factors, especially in automobiles or other high-vibration and high-temperature environments, sealing is particularly important.

[0037] Preferably, positions on the middle sleeve part and the end sleeve part prepared for arranging the outer sealing ring have embedding grooves, and the embedding grooves are used for maintaining the outer sealing ring and the middle sleeve part in a tightly embedded state.

[0038] Specifically, the embedding groove is usually an annular or semi-annular groove, and the embedding groove matches the shape of the outer sealing ring. The width and depth of the groove are adjusted according to the shape and size of the sealing ring to ensure that the sealing ring can be accurately embedded therein.

[0039] More specifically, the embedding groove is usually located at the junction of the outer side of the middle sleeve part and the end sleeve part. The embedding groove ensures that the sealing ring is tightly matched with the sleeve part and provides a fixed position for the ring.

[0040] Preferably, the outer sealing ferrule comprises a silicone base and a fluorinated polymer coating.

[0041] Specifically, the main part of the outer sealing ring is a silicone base, that is, the ring is made of silicone material. Silicone has good elasticity, high temperature resistance, aging resistance and chemical stability, can adapt to temperature changes, and maintain good sealing performance during long-term use. The silicone base has good elasticity, so that the sealing ring can be effectively compressed during installation, thereby ensuring that a uniform sealing pressure is formed on the sealing contact surface. Silicone material can usually withstand higher operating temperatures (up to 200°C or above), so it is suitable for use in environments that require high temperature tolerance and can effectively prevent sealing failure.

[0042] More specifically, the main function of the silicone base is to fit tightly with the joints through elastic deformation, thereby effectively preventing the leakage of liquids, gases and other media. The excellent sealing and adaptability of the silicone base make it particularly effective in dynamic working environments. The softness of silicone can also provide a certain buffering effect under pressure changes or vibrations, reducing the risk of sealing failure caused by equipment vibration or temperature changes.

[0043] More specifically, fluorinated polymer (such as PTFE, polytetrafluoroethylene) coatings are often used to improve the chemical resistance and wear resistance of sealing materials. PTFE has very high chemical corrosion resistance and a low friction coefficient, and can provide stronger protection in harsh working environments. Fluorinated polymer coatings have extremely strong resistance to most acids, alkalis, solvents and other chemicals, so they can effectively prevent corrosion of the seals by the external environment and extend their service life. The low friction performance of PTFE coatings helps to reduce the friction between the seals and the contact surface, reduce wear, and ensure the good performance of the seals during long-term use.

[0044] More specifically, the fluorinated polymer coating can enhance the chemical resistance and aging resistance of the sealing ring, so that the sealing ring can still maintain a good sealing effect when facing extreme environments such as high temperature and highly corrosive chemicals. The low friction characteristics of the coating help reduce the wear of the seal during use, especially in high pressure or high speed environments. The fluorinated polymer coating can effectively reduce the friction between the contact surface, thereby extending the service life of the sealing ring.

[0045] It should be noted that both the silicone base and the fluorinated polymer coating are made of transparent materials, so they will not hinder the detection of ultraviolet light irradiation, and the outer protective layer can use the same design as the outer sealing ring.

[0046] Preferably, the middle sleeve portion and the end side sleeve portion both have a first separation sleeve and a second separation sleeve, the first separation sleeve and the second separation sleeve have an interlaced interlocking structure, and the first separation sleeve and the second separation sleeve are detachably closed and installed through the interlaced interlocking structure; the insulating protective layer, the polyurethane reinforcement layer, and the outer protective layer of the middle sleeve portion and the end side sleeve portion are separately arranged in the first separation sleeve and the second separation sleeve.

[0047] Specifically, the middle sleeve part and the end sleeve part are arranged on the cable to protect the cable. There are two forms of the arrangement of the middle sleeve part and the end sleeve part. The first form is to manufacture directly on the cable with the help of an external device, so that the middle sleeve part and the end sleeve part are directly molded on the cable. In this form, the middle sleeve part and the end sleeve part are an integrated sleeve. The second form is a separate sleeve, that is, the middle sleeve part and the end sleeve part are divided into two combined parts, namely a first separate sleeve and a second separate sleeve. The first separate sleeve and the second separate sleeve have an interlaced interlocking structure, and the first separate sleeve and the second separate sleeve are detachably closed and installed through the interlaced interlocking structure.

[0048] It is understandable that the installation and disassembly of the integrated structural sleeve require the use of corresponding working devices, while the detachable structural sleeve can be installed and disassembled manually. Therefore, when a problem occurs in a certain link of the sleeve and needs to be replaced, the integrated structural sleeve needs to be replaced at a maintenance location with corresponding working devices, while the detachable structural sleeve can be replaced by itself.

[0049] More specifically, the insulating protective layer, the polyurethane reinforcement layer and the outer protective layer of the middle sleeve part and the end side sleeve part are separately arranged in the first separation sleeve and the second separation sleeve, and the structures of the middle sleeve part and the end side sleeve part are evenly divided by the first separation sleeve and the second separation sleeve, that is, in the design, the complete middle sleeve part and the end side sleeve part are cut in half from the middle to obtain the first separation sleeve and the second separation sleeve of the middle sleeve part and the first separation sleeve and the second separation sleeve of the end side sleeve part.

[0050] More specifically, the first separation sleeve and the second separation sleeve both have an insulating protective layer, a polyurethane reinforcement layer and an outer protective layer, and the polyurethane sleeve can be set on the cable by disassembling and installing the first separation sleeve and the second separation sleeve.

[0051] Preferably, the staggered interlocking structure is arranged on the outer protective layer of the first separation sleeve and the second separation sleeve, and the staggered interlocking structure of the outer protective layer of the first separation sleeve and the second separation sleeve includes at least two levels, and the staggered interlocking positions of the two levels are different.

[0052] Specifically, the first separation sleeve and the second separation sleeve are interlocked and fixed through an interlaced interlocking structure, that is, the first separation sleeve and the second separation sleeve are interlocked and fixed to each other to ensure that the first separation sleeve and the second separation sleeve can be stably combined to obtain the middle sleeve part and the end side sleeve part.

[0053] More specifically, the staggered interlocking structure is arranged on the outer protective layer, that is, the insulating protective layer and the polyurethane reinforcing layer are a smooth butt joint structure, and the overall fixation of the sleeve link is achieved by the interlocking fixation of the outer protective layer.

[0054] More specifically, the staggered interlocking structure of the outer protective layer of the first separation sleeve and the second separation sleeve includes at least two levels, and the staggered interlocking positions of the two levels are different. Due to the different staggered interlocking positions of the two levels, the sealing performance of the outer protective layer is stronger.

[0055] Preferably, the staggered interlocking structure comprises recessed portions and raised portions arranged in sequence; the edges of the recessed portions and the raised portions have a certain inclination, and the inclination of the recessed portions and the inclination of the raised portions match each other to achieve a tight fit between the recessed portions and the raised portions.

[0056] Specifically, the design of the recessed portion and the raised portion is a mutually interlocking structure, wherein the recessed portion is a concave shape, which can be understood as a groove or a concave surface, and the raised portion is a convex structure corresponding to the recessed portion, which can be inserted into the recessed portion. This concave-convex matching design is used to enhance the stability and firmness of the connection, and can also provide a certain degree of operational convenience during disassembly.

[0057] More specifically, the edges of the recessed portion and the raised portion have a certain inclination, which means that the edges of these components are not right-angled or vertical, but have a certain inclination angle. The inclined design can achieve a self-locking effect. When the recessed portion and the raised portion are engaged, the inclined edges can form a certain locking force in a certain direction to prevent them from loosening or detaching under the action of external force.

[0058] More specifically, the design of the inclined edge allows the two components to better adapt to each other's shapes when inserted into each other, thereby enhancing the tightness of the connection and avoiding looseness. The inclinations of the recessed portion and the raised portion match each other, that is, the inclination angles of the two are properly matched, so that they can fit naturally and firmly when embedded. This design helps to enhance the stability of the entire structure, reduce stress concentration at the connection, and further improve its impact resistance and tensile resistance.

[0059] More specifically, by designing the inclination of the recessed portion and the raised portion, the two components can fit tightly together during installation to achieve a tightening effect. This structural design not only enhances the firmness of the connection, but also ensures the convenience during disassembly and reinstallation, avoiding the need for too many tools or complicated operations.

[0060] More specifically, the recessed portion and the raised portion can usually be engaged together mechanically or manually. Once installed, the inclined edge design can ensure that the two remain stably connected and are not prone to falling off or loosening.

[0061] It can be understood that this design can greatly improve the connection stability of the components through the structure of the recessed portion and the raised portion with matching inclinations, and avoid loosening or falling off due to vibration, external force or long-term use. This structural design makes the connection very firm while also providing a certain degree of convenience. The inclined design of the recessed portion and the raised portion allows the operator to easily insert or remove the sleeve without making it difficult to disassemble due to strong engagement.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A polyurethane sleeve for a new energy vehicle wiring harness, characterized in that: It is composed of a plurality of polyurethane sleeve links that can be connected to each other, wherein the polyurethane sleeve links include end sleeve links and middle sleeve links, wherein the end sleeve links are arranged at both ends of the wiring harness that need to be protected in the automobile, and the middle sleeve link is arranged at a position between the two ends of the wiring harness; The intermediate sleeve link comprises an intermediate sleeve portion and an intermediate connecting portion, wherein the intermediate connecting portion is arranged at both ends of the intermediate sleeve portion, and each intermediate sleeve link is fixedly connected to each other through the intermediate connecting portion; The end-side sleeve link includes an end-side sleeve portion, an end-side connecting portion and an end-side mounting portion, the end-side connecting portion and the end-side mounting portion are respectively arranged at two ends of the end-side sleeve portion, the end-side sleeve link is arranged at the end of the wiring harness that needs to be protected inside the vehicle through the end-side mounting portion, and the end-side sleeve link is fixedly connected to the middle connecting portion of the middle sleeve link through the end-side connecting portion; The middle sleeve part of the middle sleeve link and the end sleeve part of the end sleeve link both have an insulating protective layer, a polyurethane reinforcement layer, and an outer protective layer which are nested in sequence from the inside to the outside; The outer protective layer is made of a light-transmitting material, the polyurethane reinforcement layer is composed of a plurality of polyurethane strips polymerized into strips and woven in an orderly manner, and the polyurethane in the polyurethane reinforcement layer is coated with an ultraviolet fluorescent coating, and the ultraviolet fluorescent coating has the function of uniformly displaying color under ultraviolet light, and the function of uniformly displaying color under ultraviolet light will be affected by structural defects of polyurethane.

2. A polyurethane sleeve for a new energy vehicle wiring harness as claimed in claim 1, characterized in that: The middle connecting part and the end connecting part both include a sliding nesting joint, a fixing buckle and an outer sealing ring; The sliding nested joints have the function of being inserted into each other and fixed, and the fixing buckles have the function of locking and fixing; The outer sealing ring detachable outer cover is arranged on the middle sleeve part to seal and protect the connection position between the middle sleeve part and the rest of the structure.

3. A polyurethane sleeve for a new energy vehicle wiring harness as claimed in claim 2, characterized in that: Positions on the middle sleeve part and the end sleeve part prepared for setting the outer sealing ring are provided with embedding grooves, and the embedding grooves are used for maintaining the outer sealing ring and the middle sleeve part in a tightly embedded state.

4. A polyurethane sleeve for a new energy vehicle wiring harness as claimed in claim 2, characterized in that: The outer sealing ring includes a silicone base and a fluorinated polymer coating.

5. The polyurethane sleeve for a new energy vehicle wiring harness according to claim 1, characterized in that: The middle sleeve portion and the end sleeve portion both have a first separation sleeve and a second separation sleeve, the first separation sleeve and the second separation sleeve have a staggered interlocking structure, and the first separation sleeve and the second separation sleeve are detachably closed and installed through the staggered interlocking structure; The insulating protective layer, the polyurethane reinforcement layer, and the outer protective layer of the middle sleeve part and the end side sleeve part are separately arranged in the first separation sleeve and the second separation sleeve.

6. A polyurethane sleeve for a new energy vehicle wiring harness as claimed in claim 5, characterized in that: The staggered interlocking structure is arranged on the outer protective layer of the first separation sleeve and the second separation sleeve, and the staggered interlocking structure of the outer protective layer of the first separation sleeve and the second separation sleeve includes at least two levels, and the staggered interlocking positions of the two levels are different.

7. A polyurethane sleeve for a new energy vehicle wiring harness as claimed in claim 6, characterized in that: The staggered interlocking structure comprises recessed portions and raised portions arranged in sequence; The edges of the recessed portion and the raised portion have a certain inclination, and the inclination of the recessed portion and the inclination of the raised portion match each other to achieve a tight fit between the recessed portion and the raised portion.

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