Sheath structure of halogen-free cable

Abstract

The utility model discloses a sheath structure of a halogen-free cable, relates to the technical field of cable sheaths, and solves the technical problems that the interior of a conventional cable sheath is lack of compression buffering performance, and an internal cable core is easy to damage when the compression is too large. Comprising a sheath body, the sheath body comprises an outer protection piece, an inner elastic piece and a plurality of isolation pieces, the isolation pieces are annularly and evenly distributed between the outer protection piece and the inner elastic piece, the outer protection piece and the inner elastic piece are connected through the isolation pieces, and first arc-shaped grooves are formed in the two sides of each isolation piece respectively; a second arc-shaped groove and a third arc-shaped groove are formed in the inner side of the outer protection piece and the outer side of the inner elastic piece correspondingly. According to the utility model, the internal elastic member and the separator are arranged in the cable sheath, so that the internal cable core can be isolated and protected conveniently, and the interior of the sheath has good pressure resistance and buffer performance, so that the internal cable core of the cable is not easy to damage when the cable is subjected to large pressure.

Description

Technical Field

[0001] The utility model belongs to the technical field of cable sheaths, in particular to a sheath structure of a halogen-free cable. Background Art

[0002] Cable sheath is an important component of the cable. Its main function is to protect and insulate the cable conductor to prevent the cable from being damaged by the external environment and external forces. It can also improve the mechanical strength and electrical performance of the cable.

[0003] In the prior art, the design of cable sheaths mainly focuses on external protection functions, such as moisture-proof, flame-retardant, anti-aging, etc., to ensure the stability and safety of the cable in the external environment. However, when the cable sheath is subjected to excessive pressure, the internal cable core is still easily damaged due to the lack of internal pressure buffering performance. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a sheath structure of a halogen-free cable, which solves the problem that the existing cable sheath lacks pressure buffering performance and easily causes damage to the internal cable core when the pressure is too large.

[0005] To achieve the above-mentioned purpose, according to an embodiment of the first aspect of the utility model, a sheath structure of a halogen-free cable is proposed, including a sheath body, wherein the sheath body includes an outer protective member, an inner elastic member and a plurality of isolating members, wherein the plurality of isolating members are evenly distributed in a ring shape between the outer protective member and the inner elastic member, and the outer protective member and the inner elastic member are connected by a plurality of isolating members, a first arc groove is respectively provided on both sides of the isolating member, a second arc groove and a third arc groove are respectively provided on the inner side of the outer protective member and the outer side of the inner elastic member, the second arc groove, the third arc groove and the two first arc grooves enclose an annular cavity for installing a cable core, an expansion air chamber is provided inside the inner elastic member, and an air nozzle for inflating the expansion air chamber is installed at one end of the inner elastic member.

[0006] As a further technical solution of the utility model, the outer protective member includes an outer protective layer and an inner protective layer, the outer protective layer is sleeved on the inner protective layer, the inner protective layer includes a flame retardant layer and an insulating protective layer, the flame retardant layer is connected between the outer protective layer and the insulating protective layer, and the second arc groove is arranged on the inner side of the insulating protective layer.

[0007] As a further technical solution of the utility model, the outer fixed sleeve of the inner protective layer is provided with a plurality of evenly distributed partition rings, and the plurality of partition rings divide the outer protective layer into a plurality of sheath sections.

[0008] As a further technical solution of the utility model, the material of the flame retardant layer is halogen-free flame retardant TPE, the material of the insulating protective layer is cross-linked polyethylene, and the material of the outer protective layer is polyurethane.

[0009] As a further technical solution of the utility model, the outer diameter of the partition ring is equal to the outer diameter of the outer protective layer.

[0010] As a further technical solution of the utility model, the material of the inner elastic member is EPDM rubber, and the material of the isolation member is halogen-free cross-linked polyolefin.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] In the utility model, a plurality of isolating members are used to conveniently divide the area between the outer protective member and the inner elastic member into a plurality of independent areas for installing the cable core, so that interference is not easily generated between the cable cores. The first arc grooves on both sides of the isolating members, the second arc grooves on the inner side of the outer protective member and the third arc grooves on the outer side of the inner elastic member are used to conveniently enclose and form an annular cavity for installing the cable core. An air nozzle is used to conveniently inflate the air chamber to expand the inner elastic member. The expanded inner elastic member is not only convenient for clamping and positioning the cable core, but also convenient for buffering and protecting the cable core. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of a sheath structure of a halogen-free cable of the utility model;

[0014] Figure 2 It is a three-dimensional diagram of an inner elastic member in a sheath structure of a halogen-free cable of the utility model;

[0015] Figure 3 It is a three-dimensional diagram of an outer protective component in a sheath structure of a halogen-free cable of the utility model;

[0016] Figure 4 It is a three-dimensional diagram of an isolating member in a sheath structure of a halogen-free cable of the utility model;

[0017] Figure 5 It is a stereoscopic diagram of the connection part between the inner protective layer and the partition ring in the sheath structure of a halogen-free cable of the utility model;

[0018] Figure 6 The utility model is a schematic structural diagram of an inner protective layer in a sheath structure of a halogen-free cable.

[0019] In the figure: 1. sheath body; 101. outer protective part; 1011. outer protective layer; 1012. inner protective layer; 10121. flame retardant layer; 10122. insulating protective layer; 102. inner elastic part; 103. isolating part; 2. first arc groove; 3. second arc groove; 4. third arc groove; 5. annular cavity; 6. air chamber; 7. air nozzle; 8. partition ring. DETAILED DESCRIPTION

[0020] The technical solution of the utility model will be described clearly and completely in conjunction with the embodiments below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] like Figure 1-6 As shown, a sheath structure of a halogen-free cable includes a sheath body 1, the sheath body 1 includes an outer protective member 101, an inner elastic member 102 and a plurality of isolating members 103, the outer protective member 101 includes an outer protective layer 1011 and an inner protective layer 1012, the outer protective layer 1011 is sleeved on the inner protective layer 1012, the outer protective layer 1011 is made of polyurethane, which has super wear resistance, which is more than five times that of natural rubber. In addition, polyurethane also has excellent tensile strength, tear strength, weather resistance, high temperature resistance, oil resistance and chemical resistance, as well as particularly excellent waterproof performance, which is convenient for providing good protection for the cable core of the cable.

[0022] The inner protective layer 1012 includes a flame retardant layer 10121 and an insulating protective layer 10122. In this embodiment, the material of the flame retardant layer 10121 is halogen-free flame retardant TPE. The halogen-free flame retardant TPE is a material with high elasticity, high strength, and high resilience of rubber, and has excellent flame retardant properties. It not only has a good flame retardant effect, but also facilitates buffering protection of the internal cable core. The material of the insulating protective layer 10122 is cross-linked polyethylene, which not only has excellent electrical properties, high temperature stability and heat resistance, and can withstand higher voltage and current loads, but also the cross-linked polyethylene material itself does not contain halogen and has good environmental protection effects. The flame retardant layer 10121 is connected between the outer protective layer 1011 and the insulating protective layer 10122.

[0023] The outer fixed sleeve of the inner protective layer 1012 is equipped with multiple evenly distributed partition rings 8, and the multiple partition rings 8 divide the outer protective layer 1011 into multiple sheaths 10111, so that the sheath 10111 can be isolated by the partition rings 8 when combustion occurs, thereby preventing the fire from spreading along the length direction of the outer protective layer 1011, which is beneficial to improving the fireproof effect of the cable sheath. The outer ring diameter of the partition ring 8 is equal to the outer ring diameter of the outer protective layer 1011, thereby ensuring the flatness of the outer side of the sheath body 1.

[0024] Multiple isolation members 103 are evenly distributed in a ring shape between the outer protective member 101 and the inner elastic member 102, and the outer protective member 101 and the inner elastic member 102 are connected by multiple isolation members 103. The inner elastic member 102 is made of EPDM rubber, which has good weather resistance, ozone resistance, water resistance, steam resistance, chemical corrosion resistance and electrical insulation, and is convenient to provide excellent elasticity and durability. The isolation member 103 is made of halogen-free cross-linked polyolefin, which has excellent electrical properties, heat resistance and aging resistance, and meets the halogen-free requirements, and is convenient to provide excellent electrical properties and flame retardant properties.

[0025] A first arc groove 2 is provided on both sides of the isolation member 103, a second arc groove 3 and a third arc groove 4 are provided on the inner side of the outer protective member 101 and the outer side of the inner elastic member 102, respectively. The second arc groove 3 is arranged on the inner side of the insulating protective layer 10122, and the second arc groove 3, the third arc groove 4 and the two first arc grooves 2 enclose an annular cavity 5 for installing the cable core. In this embodiment, the installed cable core is fitted with the cavity wall of the annular cavity 5, an expansion air chamber 6 is provided inside the inner elastic member 102, and an air nozzle 7 for inflating the expansion air chamber 6 is installed at one end of the inner elastic member 102, so as to facilitate the inflation of the air chamber 6 to expand the inner elastic member 102. The expanded inner elastic member 102 is not only convenient for clamping and positioning the cable core, but also convenient for buffering and protecting the cable core.

[0026] The working principle of the utility model is as follows: by using the first arc grooves 2 on both sides of the isolation member 103, the second arc grooves 3 on the inner side of the outer protective member 101 and the third arc grooves 4 on the outer side of the inner elastic member 102, an annular cavity 5 for installing the cable core can be enclosed between the outer protective member 101 and the inner elastic member 102. After the cable core is inserted and installed in the annular cavity 5, the air nozzle 7 is connected to the external inflation device to inflate the air chamber 6, so that the inner elastic member 102 expands. The expanded inner elastic member 102 is not only convenient for clamping and positioning the cable core, but also convenient for the cable core to be inserted and installed in the annular cavity 5. Buffer protection is provided, an outer protective layer 101 of polyurethane is used to form external protection for the cable core, a flame retardant layer 10121 of halogen-free flame retardant TPE and an insulating protective layer 10122 of cross-linked polyethylene are used to form an inner protective layer 1012 to facilitate insulation and flame retardant protection, and a plurality of partition rings 8 are used to divide the outer protective layer 1011 into multiple sheaths 10111, so that the sheath 10111 can be isolated by the partition ring 8 when combustion occurs, thereby preventing the fire from spreading along the length direction of the outer protective layer 1011, thereby improving the fire prevention effect of the cable sheath.

[0027] The above embodiments are only used to illustrate the technical method of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical method of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the utility model.

Claims

1. A sheath structure of a halogen-free cable, comprising a sheath body (1), characterized in that: The sheath body (1) comprises an outer protective member (101), an inner elastic member (102) and a plurality of isolating members (103); the plurality of isolating members (103) are evenly distributed in an annular shape between the outer protective member (101) and the inner elastic member (102); the outer protective member (101) and the inner elastic member (102) are connected via the plurality of isolating members (103); first arc-shaped grooves (2) are respectively provided on both sides of the isolating member (103); a second arc-shaped groove (3) and a third arc-shaped groove (4) are respectively provided on the inner side of the outer protective member (101) and the outer side of the inner elastic member (102); the second arc-shaped groove (3), the third arc-shaped groove (4) and the two first arc-shaped grooves (2) enclose an annular cavity (5) for installing a cable core; an expansion air chamber (6) is provided inside the inner elastic member (102); and a gas nozzle (7) for inflating the expansion air chamber (6) is installed at one end of the inner elastic member (102).

2. The sheath structure of a halogen-free cable according to claim 1, characterized in that: The outer protective element (101) comprises an outer protective layer (1011) and an inner protective layer (1012); the outer protective layer (1011) is sleeved on the inner protective layer (1012); the inner protective layer (1012) comprises a flame retardant layer (10121) and an insulating protective layer (10122); the flame retardant layer (10121) is connected between the outer protective layer (1011) and the insulating protective layer (10122); and the second arc-shaped groove (3) is arranged on the inner side of the insulating protective layer (10122).

3. The sheath structure of a halogen-free cable according to claim 2, characterized in that: The outer fixed sleeve of the inner protective layer (1012) is provided with a plurality of evenly distributed partition rings (8), and the plurality of partition rings (8) divide the outer protective layer (1011) into a plurality of sheath sections (10111).

4. The sheath structure of a halogen-free cable according to claim 2, characterized in that: The material of the flame retardant layer (10121) is halogen-free flame retardant TPE, the material of the insulating protective layer (10122) is cross-linked polyethylene, and the material of the outer protective layer (1011) is polyurethane.

5. The sheath structure of a halogen-free cable according to claim 3, characterized in that: The outer diameter of the partition ring (8) is equal to the outer diameter of the outer protective layer (1011).

6. The sheath structure of a halogen-free cable according to claim 1, characterized in that: The material of the inner elastic member (102) is EPDM rubber, and the material of the isolation member (103) is halogen-free cross-linked polyolefin.

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