Shielded double layer heat shrink sleeve

Abstract

The utility model belongs to heat shrinkable sleeve technical field discloses a shielding double -layer heat shrinkable sleeve, including the sleeve pipe body The sleeve pipe body includes the outer tube, the outer tube is made of irradiation crosslinking polyolefin material, and the inner surface of outer tube is compounded with the puncture -resistant protective layer, and the inner side of puncture -resistant protective layer is equipped with electromagnetic shield layer. The utility model discloses through the multilayer composite structure of outer tube, puncture -resistant protective layer, electromagnetic shield layer and hot melt adhesive layer, and the sleeve of sleeve pipe body pipe orifice is connected with the smooth structure of sleeve, has good electromagnetic shield, mechanical protection, environmental seal and convenient installation, and the setting of puncture -resistant protective layer fundamentally solves the situation that electromagnetic shield layer is easy to be damaged, and the long -term stability of shielding effectiveness is ensured, and the inner layer conductive coating and electromagnetic shield layer constitute double -screening structure through the setting, can more effectively absorb and attenuate the electromagnetic interference of different frequency, improves the shielding effectiveness of heat shrinkable sleeve.

Description

Technical Field

[0001] This utility model relates to the field of heat shrink tubing technology, and in particular to a shielded double-layer heat shrink tubing. Background Technology

[0002] In the field of wire and cable connection and protection, heat shrink tubing is widely used due to its excellent insulation, sealing, and protective properties. With the increasing sophistication of electronic equipment, electromagnetic interference (EMI) has become a key factor affecting equipment stability, thus creating an urgent need for heat shrink tubing with electromagnetic shielding capabilities.

[0003] In existing technologies, common shielded heat shrink tubing typically uses a single layer of metal foil or metal braided mesh as the shielding layer. However, this structure has significant shortcomings: First, the metal shielding layer is easily damaged during tubing installation and use due to bending, squeezing, or puncture by sharp objects, leading to a sharp decline in shielding effectiveness that is difficult to repair. Second, when threading the tubing onto wire harnesses with metal connectors, the sharp edges of the tubing can easily scratch the shielding layer, and excessive friction during threading can even cause installation difficulties. Furthermore, most existing products have limited functionality, either prioritizing shielding at the expense of environmental sealing, or prioritizing sealing at the expense of sufficient shielding performance, making it difficult to provide stable and reliable multiple protections simultaneously in complex electromagnetic environments and harsh working conditions (such as automotive engine compartments and industrial sites). Utility Model Content

[0004] To overcome the technical defects of the existing technology, this utility model provides a shielded double-layer heat shrinkable sleeve.

[0005] The technical solution adopted by this utility model is: a shielded double-layer heat shrinkable sleeve, including a sleeve body. The sleeve body includes an outer tube, which is made of irradiated cross-linked polyolefin material. The inner surface of the outer tube is coated with a puncture-resistant protective layer. An electromagnetic shielding layer is provided inside the puncture-resistant protective layer. The electromagnetic shielding layer is a conductive braided mesh made of metal fibers and polymers. A hot melt adhesive layer is provided inside the electromagnetic shielding layer. The hot melt adhesive layer is composed of flame-retardant hot melt adhesive. The inner sides of the openings at both ends of the sleeve body are provided with a smooth fitting structure. The smooth fitting structure includes a rounded chamfered surface provided at the opening of the sleeve body.

[0006] Preferably, the smooth-fitting structure further includes a low-friction coating applied to the inner wall of the rounded chamfered surface.

[0007] Preferably, the inner surface of the electromagnetic shielding layer is coated with an inner conductive coating, and a hot melt adhesive layer is laminated on the inner side of the inner conductive coating.

[0008] Preferably, the inner conductive coating is made of conductive silver paste or carbon material.

[0009] Preferably, the two ends of the sleeve body are electrically connected to the electromagnetic shielding layer and the inner conductive coating layer through conductive sealant.

[0010] Preferably, the puncture-resistant protective layer is composed of aromatic polyamide fibers or high-strength polyester fiber nonwoven fabric embedded in the inner surface of the outer tube.

[0011] Preferably, the low-friction coating is a polytetrafluoroethylene dispersion coating or a silicone-based lubricating coating.

[0012] Preferably, the wall thickness of the outer tube is greater than the wall thickness of the hot melt adhesive layer.

[0013] The beneficial effects of this utility model are:

[0014] 1. Through a multi-layered composite structure consisting of an outer tube, a puncture-resistant protective layer, an electromagnetic shielding layer, and a hot melt adhesive layer, coupled with a smooth-fitting structure at the tube opening, it offers excellent electromagnetic shielding, mechanical protection, environmental sealing, and ease of installation. The puncture-resistant protective layer fundamentally solves the problem of the electromagnetic shielding layer being easily damaged, ensuring the long-term stability of shielding effectiveness. The smooth-fitting structure reduces installation difficulty and the risk of damage, improving construction efficiency and quality consistency.

[0015] 2. By combining the inner conductive coating layer with the electromagnetic shielding layer to form a double shielding structure, the heat shrink tubing can more effectively absorb and attenuate electromagnetic interference of different frequencies, thus improving its shielding performance. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a half-sectional view of the overall structure of this utility model.

[0019] Explanation of reference numerals in the attached figures: 1. Tube body; 101. Outer tube; 102. Puncture-resistant protective layer; 103. Electromagnetic shielding layer; 104. Hot melt adhesive layer; 105. Inner conductive coating; 106. Conductive sealant; 2. Smooth connection structure; 201. Rounded chamfered surface; 202. Low-friction coating. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0021] like Figure 1 and Figure 2 As shown, this embodiment provides a shielded double-layer heat shrinkable sleeve, including a sleeve body 1. The sleeve body 1 includes an outer tube 101, which is made of irradiated cross-linked polyolefin material. The inner surface of the outer tube 101 is laminated with a puncture-resistant protective layer 102. An electromagnetic shielding layer 103 is provided on the inner side of the puncture-resistant protective layer 102. The electromagnetic shielding layer 103 is a conductive braided mesh made of metal fibers and polymers. A hot melt adhesive layer 104 is provided on the inner side of the electromagnetic shielding layer 103. The hot melt adhesive layer 104 is made of flame-retardant hot melt adhesive. The inner sides of the openings at both ends of the sleeve body 1 are provided with a smooth-fitting structure 2. The smooth connection structure 2 includes a rounded chamfered surface 201 at the opening of the sleeve body 1. Through a multi-layer composite structure of the outer tube 101, puncture-resistant protective layer 102, electromagnetic shielding layer 103, and hot melt adhesive layer 104, and supplemented by the smooth connection structure 2 at the opening of the sleeve body 1, it has good electromagnetic shielding, mechanical protection, environmental sealing, and ease of installation. The puncture-resistant protective layer 102 fundamentally solves the problem of easy damage to the electromagnetic shielding layer 103, ensuring the long-term stability of shielding effectiveness. The smooth connection structure 2 reduces installation difficulty and damage risk, and improves construction efficiency and quality consistency.

[0022] The smooth connection structure 2 also includes a low-friction coating 202 coated on the inner wall of the rounded chamfered surface 201. By adding the low-friction coating 202 to the inner wall of the rounded chamfered surface 201, the frictional resistance during installation is further reduced, making the sleeve body 1 smoother when threading complex wire harnesses, achieving non-destructive installation, which is especially suitable for scenarios with narrow space or sharp metal joints.

[0023] The inner surface of the electromagnetic shielding layer 103 is coated with an inner conductive coating 105, and a hot melt adhesive layer 104 is laminated on the inner side of the inner conductive coating 105. The inner conductive coating 105 and the electromagnetic shielding layer 103 form a double shielding structure, which can more effectively absorb and attenuate electromagnetic interference of different frequencies, improve the shielding performance of the heat shrink sleeve, and is especially suitable for automotive electronics, communication base stations and other occasions with extremely high electromagnetic compatibility requirements.

[0024] The inner conductive coating 105 is made of conductive silver paste or carbon material, providing a specific solution for high conductivity and reliability, and ensuring the stable implementation of the inner shielding function.

[0025] The two ends of the sleeve body 1 are electrically connected to the electromagnetic shielding layer 103 and the inner conductive coating 105 through conductive sealant 106, which ensures the electrical continuity and equipotential of the entire shielding cavity, avoids the "edge leakage" problem caused by discontinuous end shielding, and enhances the sealing performance of the ends of the sleeve body 1.

[0026] The puncture-resistant protective layer 102 is composed of aromatic polyamide fiber or high-strength polyester fiber nonwoven fabric embedded in the inner surface of the outer tube 101, which provides a material basis for good mechanical protection performance and can effectively resist external puncture and abrasion.

[0027] The low-friction coating 202 is a polytetrafluoroethylene dispersion coating or a silicone-based lubricating coating, which ensures the reliability and manufacturability of the smooth-fitting structure 2.

[0028] The outer tube 101 has a wall thickness greater than that of the hot melt adhesive layer 104, ensuring that the mechanical strength and durability of the sleeve body 1 are borne by the outer tube 101, while an appropriate amount of hot melt adhesive is sufficient to achieve a seal without excessive material waste, thus optimizing the product structure and cost.

[0029] During operation, when heat is applied to the outer tube 101 of the sleeve body 1, the memory effect of the irradiated cross-linked polyolefin material is activated, driving the sleeve body 1 to radially and uniformly shrink to a preset diameter, tightly wrapping around the cable joint or assembly. Simultaneously, the inner hot melt adhesive layer 104 melts upon heating, becoming a viscous flow state. Under the radial pressure generated by the shrinkage of the sleeve body 1, it is forced to flow towards and fully fill all gaps and irregular surfaces at the cable joint, forming a seal without dead angles. After cooling and solidification, it achieves excellent waterproof, moisture-proof, and dustproof sealing effects, and has good strain relief capabilities. After the sleeve body 1 shrinks and is secured to the outside of the protected object, the electromagnetic shielding layer 103 inside the sleeve body 1 forms a continuous metallic conductive shell. The conductive braided mesh effectively reflects and absorbs electromagnetic interference from the outside. When an inner conductive coating 105 is present, the inner conductive coating 105 and the electromagnetic shielding layer 103 are electrically connected through the conductive sealant 106 at the ends, forming a double-layer shielding structure. The electromagnetic shielding layer 103 mainly reflects high-frequency interference, while the inner conductive coating 105 can absorb and guide away some low-frequency interference. The electromagnetic shielding layer 103 and the inner conductive coating 105 work together to help suppress broadband electromagnetic interference. The puncture-resistant protective layer 102 effectively resists friction, compression, and puncture from sharp objects from the outside, ensuring that the inner electromagnetic shielding layer 103 is not damaged during installation and use, and guaranteeing the long-term stability of the shielding effectiveness.

[0030] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0031] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A shielded double-layer heat shrinkable sleeve, characterized in that: The casing (1) includes an outer tube (101), which is made of irradiated cross-linked polyolefin material. The inner surface of the outer tube (101) is coated with a puncture-resistant protective layer (102). An electromagnetic shielding layer (103) is provided on the inner side of the puncture-resistant protective layer (102). The electromagnetic shielding layer (103) is a conductive braided mesh made of metal fibers and polymers. A hot melt adhesive layer (104) is provided on the inner side of the electromagnetic shielding layer (103). The hot melt adhesive layer (104) is made of flame-retardant hot melt adhesive. The inner sides of the openings at both ends of the sleeve body (1) are provided with a smooth connection structure (2), which includes a rounded chamfered surface (201) at the opening of the sleeve body (1).

2. The shielded double-layer heat shrinkable sleeve according to claim 1, characterized in that: The smooth-fitting structure (2) further includes a low-friction coating (202) applied to the inner wall of the rounded chamfered surface (201).

3. The shielded double-layer heat shrinkable sleeve according to claim 1, characterized in that: The inner surface of the electromagnetic shielding layer (103) is coated with an inner conductive coating (105), and a hot melt adhesive layer (104) is laminated on the inner side of the inner conductive coating (105).

4. The shielded double-layer heat shrinkable sleeve according to claim 3, characterized in that: The inner conductive coating (105) is made of conductive silver paste or carbon material.

5. A shielded double-layer heat shrinkable sleeve according to claim 4, characterized in that: The two ends of the sleeve body (1) are electrically connected to the electromagnetic shielding layer (103) and the inner conductive coating layer (105) by conductive sealant (106).

6. The shielded double-layer heat shrinkable sleeve according to claim 1, characterized in that: The puncture-resistant protective layer (102) is composed of aromatic polyamide fiber or high-strength polyester fiber nonwoven fabric embedded in the inner surface of the outer tube (101).

7. A shielded double-layer heat shrinkable sleeve according to claim 2, characterized in that: The low-friction coating (202) is a polytetrafluoroethylene dispersion coating or a silicone-based lubricating coating.

8. The shielded double-layer heat shrinkable sleeve according to claim 1, characterized in that: The wall thickness of the outer tube (101) is greater than the wall thickness of the hot melt adhesive layer (104).

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