A high-strength shielded cable

Abstract

The present invention belongs to the field of cable technology, and specifically relates to a high-strength shielded cable, which comprises, from the inside to the outside, a wire core, an inner protective sleeve, a filling layer, a flame retardant layer, and an outer protective sleeve, wherein the inner protective sleeve is sleeved on the outside of the wire core to form an insulating wire core, and the number of the wire cores is not less than 4; a number of supporting components are evenly arranged between the filling layer and the flame retardant layer; the arrangement of the T-shaped limiter in the supporting component of the present invention can improve the connection rigidity between the flame retardant layer and the filling layer, while the arrangement of the inner shielding component can also improve the electromagnetic shielding performance, and at the same time, with the use of a composite absorbing shielding material composed of a low-frequency shielding layer in the filling layer and a bonded high-frequency shielding layer, the cable can be used for electromagnetic wave absorption and electromagnetic interference suppression in high-frequency and low-frequency bands at the same time, and the internal structure has better integrity and stronger connection rigidity, which can minimize the damage of the cable shielding layer due to external force.

Description

Technical Field

[0001] The invention belongs to the technical field of cables, and in particular relates to a high-strength shielded cable. Background Art

[0002] A cable is usually a rope-like cable made of several or several groups of wires (at least two in each group). Each group of wires is insulated from each other and often twisted around a center wire. The entire outside is covered with a highly insulating covering. The cable has the characteristics of internal power supply and external insulation.

[0003] The cable industry is closely related to all sectors of the national economy. Wires and cables are also called the "arteries" and "nerves" of the national economy. They are essential basic equipment for transmitting electrical energy, transmitting information, manufacturing various motors, instruments, and meters, and realizing electromagnetic energy conversion. They are essential basic products in the future electrification and information society.

[0004] Cables often need to be stretched and moved back and forth during use and installation, so there are high requirements for the tensile and torsional properties of the cables. In the prior art, there is a metal shield between the outer insulating sheath of the cable and the internal wires. The shielding layer can reduce radiation, prevent information from being eavesdropped, and prevent the entry of external electromagnetic interference, so that the wires have a higher transmission rate. However, due to the poor tensile and torsional properties of existing cables, the shielding layer is easily damaged by external forces, resulting in a decrease in electromagnetic shielding performance. Therefore, the internal structure of the cable needs to be improved. Summary of the invention

[0005] The object of the present invention is to provide a high-strength shielded cable to solve the problems raised in the background technology.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0007] A high-strength shielded cable, which comprises, from inside to outside, a wire core, an inner protective sheath, a filling layer, a flame retardant layer, and an outer protective sheath, wherein the inner protective sheath is arranged on the outer side of the wire core to form an insulating wire core, and the number of the wire cores is not less than 4; a plurality of supporting components are evenly arranged between the filling layer and the flame retardant layer;

[0008] The supporting component includes an arched base arranged outside the filling layer, a T-shaped limiter rotatably arranged in the base and extending into the flame retardant layer, the T-shaped limiter is connected to the base through a pin shaft, and a torsion spring is sleeved on the pin shaft between the T-shaped limiter and the base.

[0009] As a further optimization solution of the present invention, the T-shaped limiter comprises an inner shielding member braided with tinned copper wire and aluminum-plastic and a PVC outer shell sleeved on the outer side of the inner shielding member.

[0010] As a further optimization scheme of the present invention, the filling layer includes a connecting layer, a low-frequency shielding layer and a high-frequency shielding layer connected in sequence by an adhesive, wherein the connecting layer and the base are integrally formed by polyurethane rubber injection molding, the low-frequency shielding layer is an iron-nickel alloy with a thickness of 0.05-0.5 mm, and the high-frequency shielding layer is one of copper foil or silver foil with a thickness of 0.5-1.5 mm.

[0011] As a further optimization solution of the present invention, the adhesive is an acrylic pressure-sensitive adhesive.

[0012] As a further optimization scheme of the present invention, the inner protective sleeve is obtained by mixing aluminum hydroxide, antimony trioxide and zinc oxide at high temperature and extruding them.

[0013] As a further optimization scheme of the present invention, the outer protective sleeve is obtained by mixing polyimide and polybutadiene acrylonitrile rubber at high temperature and extruding them.

[0014] As a further optimization solution of the present invention, the flame retardant layer includes a rubber airbag and a polyurethane foam filler filled in the rubber airbag.

[0015] The beneficial effects of the present invention are:

[0016] 1) The flame retardant layer of the present invention allows the rubber airbag inside to gradually expand and rupture under the influence of combustion or ultra-high temperature environment or be directly burned by open flames, so that the rubber airbag ruptures and the polyurethane foam filler inside it spills out, which can have a flame retardant effect on the cable and improve the safety performance inside the cable;

[0017] 2) The arrangement of the filling layer and the supporting component in the present invention enables the flame retardant layer and the outer protective sheath as a connected whole to deflect to a certain extent relative to the inner filling layer under the action of an external force. In this way, when the cable is twisted or squeezed during the laying process, the deflection to a certain extent can buffer the torsional force, so that the overall rigidity of the cable is not affected, and the material properties of its components are less damaged when squeezed or twisted, so that the strength of the cable is higher;

[0018] 3) The arrangement of the T-shaped limiter in the supporting component of the present invention can improve the connection rigidity between the flame retardant layer and the filling layer. The arrangement of the inner shielding component can also improve the electromagnetic shielding performance. At the same time, the use of a composite wave-absorbing shielding material composed of a low-frequency shielding layer in the filling layer and a bonded high-frequency shielding layer makes the cable suitable for electromagnetic wave absorption and electromagnetic interference suppression in both high-frequency and low-frequency bands, and the internal structure has better integrity and stronger connection rigidity, which can minimize damage to the cable shielding layer due to external forces. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 is an enlarged structural schematic diagram of the support component of the present invention;

[0021] Figure 3 It is a schematic diagram of the cross-sectional structure of the filling layer in the present invention;

[0022] Figure 4 It is a schematic diagram of the cross-sectional structure of the T-shaped limiter in the present invention.

[0023] In the figure: 1. wire core; 2. inner protective sleeve; 3. filling layer; 4. flame retardant layer; 5. supporting component; 6. outer protective sleeve; 31. connecting layer; 32. low-frequency shielding layer; 33. high-frequency shielding layer; 51. base; 52. pin shaft; 53. T-type limiter; 531. inner shielding component; 532. PVC shell. DETAILED DESCRIPTION

[0024] The present application is described in further detail below. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0025] Example 1

[0026] like Figure 1-4 As shown, a high-strength shielded cable comprises, from inside to outside, a wire core 1, an inner protective sheath 2, a filling layer 3, a flame retardant layer 4, and an outer protective sheath 6, wherein the inner protective sheath 2 is sleeved on the outer side of the wire core 1 to form an insulated wire core, and the number of the wire cores 1 is not less than 4; a plurality of supporting components 5 are evenly arranged between the filling layer 3 and the flame retardant layer 4;

[0027] In this embodiment, the inner protective sheath 2 is obtained by high-temperature mixing and extrusion molding of aluminum hydroxide, antimony trioxide and zinc oxide. The above are all inorganic flame retardant materials, which can improve the flame retardant performance and have excellent insulation performance; the outer protective sheath 6 is obtained by high-temperature mixing and extrusion molding of polyimide and polybutadiene acrylonitrile rubber, which further improves the insulation performance of the cable and has better toughness of the outer protective sheath material, making the cable using this structure safer and not easy to deform during wiring; the flame retardant layer 4 includes a rubber airbag and a polyurethane foam filler filled in the rubber airbag. The rubber airbag in the cable in this embodiment gradually expands and ruptures under the influence of combustion or ultra-high temperature environment, or is directly burned by open flames, causing the rubber airbag to rupture, and the polyurethane foam filler inside it will spill out, which can have a flame retardant effect on the cable, thereby improving the safety performance inside the cable.

[0028] The supporting component 5 includes an arched base 51 arranged outside the filling layer 3, and a T-shaped limiter 53 rotatably arranged in the base 51 and extending into the flame retardant layer 4. The T-shaped limiter 53 and the base 51 are connected by a pin 52, and a torsion spring is sleeved on the pin 52 between the T-shaped limiter 53 and the base 51.

[0029] In this embodiment, the support component 5 forms a connection relationship between the flame retardant layer 4 and the filling layer 3, and the T-shaped limiter 53 extends into the flame retardant layer 4, so that the connection between the flame retardant layer 4 and the filling layer 3 is more firm, and the arched base 51 can leave a gap between the flame retardant layer 4 and the filling layer 3, and the gap is from Figure 1 It can also be seen that the thermal insulation between the insulating core inside the cable and the outside can be improved to prevent the insulating core from being affected by the external temperature and thus affecting the power transmission; in addition, due to the rotational connection between the T-shaped limiter 53 and the base 51 and the provision of a torsion spring, this arrangement allows the flame retardant layer 4 and the outer protective sheath 6 as a connected whole to be deflected to a certain extent relative to the internal filling layer 3 under the action of an external force, so that when the cable is twisted or squeezed during laying, a certain degree of deflection can buffer the torsional force, so that the overall rigidity of the cable is not affected, and the material properties of its components are less damaged when squeezed or twisted.

[0030] In order to further improve the shielding performance of the cable, the T-shaped limiter 53 includes an inner shielding member 531 woven of tinned copper wire and aluminum-plastic and a PVC outer shell 532 sleeved on the outside of the inner shielding member 531. The weaving of the tinned copper wire and the aluminum-plastic makes the combination between the two tighter, which improves the electromagnetic shielding performance while also improving the tensile performance. In addition, the setting of the PVC outer shell 532 can improve the overall rigidity of the T-shaped limiter 53 to prevent the T-shaped limiter 53 itself from being deformed when the cable is subjected to excessive torsional force, while taking advantage of the good rigidity and light weight of the PVC material.

[0031] In order to further improve the electromagnetic shielding performance of the cable while improving the overall rigidity, the filling layer 3 includes a connecting layer 31, a low-frequency shielding layer 32 and a high-frequency shielding layer 33 which are connected in sequence by an adhesive, wherein the connecting layer 31 and the base 51 are integrally formed by polyurethane rubber injection molding, so that the overall rigidity between the filling layer 3 and the supporting component 5 is better, the low-frequency shielding layer 32 is a 0.05-0.5 mm thick iron-nickel alloy, and the high-frequency shielding layer 33 is a 0.5-1.5 mm thick copper foil or silver foil. By using a composite absorbing and shielding material composed of a low-frequency shielding layer 32 and a bonded high-frequency shielding layer 33, the cable can be used for electromagnetic wave absorption and electromagnetic interference suppression in both high-frequency and low-frequency bands.

[0032] Specifically, the adhesive is an acrylic pressure-sensitive adhesive, so that the components in the filling layer 3 dry quickly, and the high temperature resistance and cold resistance are more prominent, and the durability and resistance to weak acids and weak alkalis are also good.

[0033] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A high-strength shielded cable, characterized in that: The device comprises, from the inside to the outside, a wire core (1), an inner protective sheath (2), a filling layer (3), a flame retardant layer (4), and an outer protective sheath (6), wherein the inner protective sheath (2) is sheathed on the outside of the wire core (1) to form an insulated wire core, and the number of the wire cores (1) is not less than 4; a plurality of supporting components (5) are evenly arranged between the filling layer (3) and the flame retardant layer (4); The support component (5) comprises a base (51) arranged outside the filling layer (3) and arranged in an arch shape, and a T-shaped stopper (53) rotatably arranged in the base (51) and extending into the flame retardant layer (4), the T-shaped stopper (53) and the base (51) are connected via a pin (52), and a torsion spring is sleeved on the pin (52) between the T-shaped stopper (53) and the base (51); The T-shaped stopper (53) comprises an inner shielding member (531) made of tinned copper wire and aluminum-plastic braid, and a PVC outer shell (532) sleeved on the outer side of the inner shielding member (531); The filling layer (3) comprises a connection layer (31), a low-frequency shielding layer (32) and a high-frequency shielding layer (33) connected in sequence by an adhesive, wherein the connection layer (31) and the base (51) are integrally formed by injection molding of polyurethane rubber, the low-frequency shielding layer (32) is an iron-nickel alloy with a thickness of 0.05-0.5 mm, and the high-frequency shielding layer (33) is one of a copper foil or a silver foil with a thickness of 0.5-1.5 mm; The flame retardant layer (4) comprises a rubber airbag and a polyurethane foam filler filled in the rubber airbag.

2. A high-strength shielded cable according to claim 1, characterized in that: The adhesive is an acrylic pressure-sensitive adhesive.

3. A high-strength shielded cable according to claim 1, characterized in that: The inner protective sleeve (2) is obtained by mixing aluminum hydroxide, antimony trioxide and zinc oxide at high temperature and then extruding and molding.

4. A high-strength shielded cable according to claim 1, characterized in that: The outer protective sleeve (6) is obtained by mixing polyimide and polybutadiene acrylonitrile rubber at high temperature and extruding them.

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