Medium-voltage environment-friendly flame-retardant water-blocking cable

Abstract

The utility model discloses a medium-voltage environment-friendly flame-retardant water-blocking cable, which comprises a lead and a protective jacket wrapped outside the lead, and the protective jacket is of a multi-layer structure and sequentially comprises a water-blocking tape wrapping protective layer, a metal water-blocking layer, a second glass fiber cloth wrapping layer, an isolation sleeve, a steel belt layer, a first glass fiber cloth wrapping layer and an outer sheath from inside to outside. Wherein the steel belt layer is an interlocking armor, and the double-layer steel belt forms an interlocking structure through the radian barbs of the double-layer steel belt. According to the flame-retardant and water-resistant cable, the protective jacket of a multi-layer structure is adopted to wrap the wire to protect the wire, and the double-layer steel belt is adopted to form the interlocking armor of an interlocking structure through the radian barbs of the steel belt, so that flame and water can be prevented from invading and damaging the internal structure, the flame-retardant and water-resistant functions are realized, and the overall flame-retardant and water-resistant performance of the cable can be greatly improved. In addition, the selected materials are all halogen-free low-smoke materials, toxic and harmful gas cannot be generated during combustion, and the environment-friendly material is fully friendly to the environment.

Description

TECHNICAL FIELD

[0001] The utility model belongs to cable technical field, concretely relates to a kind of medium voltage environmental protection flame-retardant water-resisting cable. BACKGROUND

[0002] The statements herein are provided only to provide context for the utility model and are not necessarily intended to constitute prior art.

[0003] With the implementation of new version national fire protection specification, the fire protection standard in building field is increasingly strict, and the importance of power cable as the key material to guarantee fire safety is increasingly highlighted, and it has been widely concerned. Under the current high-standard specification environment, B1 grade flame-retardant cable emerges as the times require, and it is particularly needed in places with large passenger flow such as schools, hospitals, subways, airports, stadiums and exhibition centers. From the technical point of view, the optimization design of flame-retardant cable mainly focuses on the improvement of cable structure, for example, by increasing fire-resistant layer or oxygen barrier layer to improve its flame-retardant performance. In terms of material selection, manufacturers continuously strengthen the flame-retardant properties of the cable by replacing the traditional filling rope with flame-retardant filling rope, or adding fireproof mud before extruding the outer sheath, or improving the formula of the outer sheath material. These measures can build a protective barrier when the cable is on fire, effectively inhibit the further damage of the flame to the internal structure of the cable, so as to achieve the effect of flame retardation. At the same time, the selection of sheath material can also realize some specific additional functions, such as low smoke and low spread.

[0004] For example, the patent document with publication number CN210535412U discloses a flame-retardant water-resistant high-voltage cross-linked cable, which uses halogen-free low-smoke flame-retardant polyolefin sheath material for the non-metal sheath layer, reducing the release of halogen gas and smoke during cable combustion; the conductive layer uses flame-retardant polyolefin semi-conductive shielding sheath material, and the flame-retardant semi-conductive layer is formed by co-extrusion of the sheath layer and the conductive layer, reducing heat transfer during cable combustion and increasing the flame-retardant performance of the cable.

[0005] For example, the patent document with publication number CN209880251U discloses a low-smoke halogen-free flame-retardant water-resistant armored three-core medium voltage cable, in which the longitudinal water-resistant layer is formed by overlapping and wrapping semi-conductive water-resistant tapes, the extrusion filling + isolation layer is formed by one-time extrusion filling of the gap between the three cores and extrusion of the isolation sleeve to form a closed and seamless water-resistant whole, the armored layer is formed by tightly arranging flat metal wires on the isolation layer using an auxiliary mold, and the low-smoke halogen-free flame-retardant outer sheath is directly extruded. The armored layer, the isolation sleeve and the outer sheath are integrated as a whole, forming a tight water-resistant structure, which solves the problems of difficult water resistance of armored cable, difficult low-smoke halogen-free flame retardation of water-resistant cable and difficult implementation of longitudinal aluminum-plastic composite tape and metal sheath process of three-core cable.

[0006] For example, patent literature with publication number CN217333708U discloses a low-smoke halogen-free high-voltage power cable, which has a conductive layer and a non-metal sheath layer arranged on the inner side and the outer side of the fire barrier layer respectively, and both are polyolefin layers, so that the conductive layer and the non-metal sheath layer do not produce excessive halogen during combustion, improving the halogen-free performance of the cable, and the cable can be applied to occasions with high flame retardant requirements and small secondary hazards, and various densely populated public places.

[0007] However, the inventors found that, in addition to meeting the B1 performance, higher waterproof and moisture-proof additional functions are required for specific cable laying environments, and the design structure of most B1 grade cables is unreasonable, resulting in a large amount of redundant materials in flame retardant performance, and unnecessary waste of flame retardant materials. Practical new type content

[0008] The utility model discloses in order to overcome the insufficient of prior art, provide a kind of medium pressure environmental protection flame-retardant water-resisting cable, adopt the protection of multilayer structure outer cover to wire and form protective effect to wire, and adopt double-layer steel band and form interlocking structure's chain armor by the arc hook of itself, can prevent flame moisture from invading and destroying internal structure, realize flame-retardant water-resisting function, can greatly increase the overall flame-retardant water-resisting performance of cable.In addition, the material selected is all halogen-free low-smoke material, and no toxic and harmful gas is generated during combustion, which is fully friendly to the environment.

[0009] In order to achieve the above-mentioned purpose, the utility model is realized through the following technical scheme:

[0010] The technical scheme of the utility model provides a kind of medium pressure environmental protection flame-retardant water-resisting cable, comprising: wire and the protection of outer cover covered in wire outside;The protection of outer cover is multilayer structure, and from inside to outside, it is water-resisting tape winding protection layer, metal water-resisting layer, second glass fiber cloth winding layer, spacer sleeve, steel band layer, first glass fiber cloth winding layer and outer sheath in proper order;Wherein, the steel band layer is chain armor, and double-layer steel band forms interlocking structure by the arc hook of itself.

[0011] In at least one embodiment, the chain armor is a non-magnetic stainless steel band chain armor.

[0012] In at least one embodiment, the metal water-resisting layer is a high-performance aluminum-plastic composite tape longitudinal package.

[0013] In at least one embodiment, the outer sheath is a thermoplastic flame-retardant B1 type halogen-free low-smoke polyolefin sheath material with an oxygen index not less than 32.

[0014] In at least one embodiment, the first glass fiber cloth winding layer and the second glass fiber cloth winding layer are both halogen-free low-smoke high-flame-retardant glass fiber tape.

[0015] In at least one embodiment, the isolating sleeve is a thermoplastic halogen-free low-smoke polyolefin sheath material with a flame retardant index of not less than 40.

[0016] In at least one embodiment, the water-blocking tape wrapping protective layer is a semi-conductive buffer water-blocking tape.

[0017] In at least one embodiment, the wire includes a conductor and a shielding water-blocking layer wrapped outside the conductor.

[0018] In at least one embodiment, the shielding water-blocking layer is a multi-layer structure, from inside to outside, in order, a conductor shielding layer, an insulation layer, an insulation shielding layer, a wire water-blocking tape wrapping layer, and a metal shielding layer.

[0019] In at least one embodiment, the wire water-blocking tape wrapping layer is a semi-conductive buffer water-blocking tape.

[0020] The beneficial effects of the technical scheme of the utility model are as follows:

[0021] 1) The medium-voltage environmentally-friendly flame-retardant and water-blocking cable of the utility model adopts a multi-layer protective sheath to protect the wire, from inside to outside, in order, a water-blocking tape wrapping protective layer, a metal water-blocking layer, a second glass fiber cloth wrapping layer, an isolating sleeve, a steel belt layer, a first glass fiber cloth wrapping layer, and an outer sheath.

[0022] 2) The isolating sleeve and the outer sheath of the protective sheath of the medium-voltage environmentally-friendly flame-retardant and water-blocking cable of the utility model are made of halogen-free low-smoke B1 flame-retardant material, which has a small amount of smoke and does not produce toxic and harmful corrosive gases, is fully friendly to the human body and the environment, has a self-extinguishing feature, cooperates with the non-magnetic stainless steel belt interlocking armor, the first glass fiber cloth wrapping layer, and the second glass fiber cloth wrapping layer to achieve better flame-retardant effect, and can better protect the insulated core from being ablated by external flames.

[0023] 3) The non-magnetic stainless steel belt interlocking armor of the medium-voltage environmentally-friendly flame-retardant and water-blocking cable of the utility model plays a role in isolating external moisture, cooperates with the longitudinal aluminum-plastic composite tape to better prevent external moisture, and the water-blocking tape expands when encountering water, which can better isolate external moisture and humid air.

[0024] 4) The medium voltage environment-friendly flame-retardant and water-resistant cable has excellent flame-retardant performance and good water-resistant effect, and the selected materials are all halogen-free and low-smoke materials, so that no toxic and harmful gas is generated during combustion, and the environment is fully friendly. BRIEF DESCRIPTION OF DRAWINGS

[0025] The drawings constituting a part of the present utility model are used to provide further understanding of the present utility model, and the illustrative embodiments of the present utility model and the description thereof are used to explain the present utility model, and do not constitute undue limitation on the present utility model.

[0026] Figure 1 is a structural schematic diagram of the medium voltage environment-friendly flame-retardant and water-resistant cable of the present utility model;

[0027] Figure 2 is a chain armor structure schematic diagram of the medium voltage environment-friendly flame-retardant and water-resistant cable of the present utility model.

[0028] In the drawing: 101. outer sheath; 102. first glass fiber cloth wrapping layer; 103. steel belt layer; 104. isolation sleeve; 105. second glass fiber cloth wrapping layer; 106. metal water-resistant layer; 107. water-resistant belt wrapping protection layer; 201. metal shielding layer; 202. wire water-resistant belt wrapping layer; 203. insulation shielding layer; 204. insulation layer; 205. conductor shielding layer; 206. conductor.

[0029] The mutual distance or size is exaggerated for showing the position of each part, and the schematic diagram is only used for illustration. DETAILED DESCRIPTION

[0030] It should be pointed out that the following detailed description is all exemplary, and aims to provide further description of the present utility model. Unless otherwise specified, all technical and scientific terms used in the present utility model have the same meaning as that generally understood by the ordinary skilled in the art to which the present utility model belongs.

[0031] As introduced in the background art, the purpose of the present utility model is to overcome the deficiencies in the prior art, and to provide a medium voltage environment-friendly flame-retardant and water-resistant cable. The wire is protected by a multi-layer structure of protective outer sheath, and the chain armor is formed by the interlocking structure of the double-layer steel belt through the self-radiancy barb, so that the flame and water are prevented from invading and damaging the internal structure, the flame-retardant and water-resistant functions are realized, and the overall flame-retardant and water-resistant performance of the cable is greatly increased. In addition, the selected materials are all halogen-free and low-smoke materials, so that no toxic and harmful gas is generated during combustion, and the environment is fully friendly.

[0032] Example 1

[0033] As Figure 1As shown, the embodiment discloses a medium-voltage environmentally friendly flame-retardant and water-resistant cable, which comprises a wire and a protective outer cover wrapped outside the wire, and the protective outer cover is a multi-layer structure, which comprises, from inside to outside, a water-resistant tape wrapping protective layer 107, a metal water-resistant layer 106, a second glass fiber cloth wrapping layer 105, an isolation sleeve 104, a steel belt layer 103, a first glass fiber cloth wrapping layer 102 and an outer sheath 101. The steel belt layer 103 is a chain armor, and the double-layer steel belt forms an interlocking structure through its own arc hook.

[0034] In the embodiment, the chain armor is specifically a non-magnetic stainless steel belt chain armor. Since a single-core cable generates an eddy current and a magnetic field after being electrified, which causes high temperature of the cable, the use of the non-magnetic stainless steel belt armor can shield the magnetic field, and the stainless steel belt has good mechanical properties, which can better protect the cable and increase the tensile strength of the cable. In addition, the conventional armor is usually a double-layer steel belt gap wrapping armor, which can only play a mechanical protection role, i.e. can only resist pressure and cannot prevent water and fire. The double-layer steel belt of the chain armor forms an interlocking structure through its own arc hook in addition to the basic cover, which can prevent the flame and water from invading and destroying the internal structure, realize the flame-retardant and water-resistant functions, and greatly increase the overall flame-retardant and water-resistant performance of the cable.

[0035] In the embodiment, the metal water-resistant layer 106 is specifically a high-performance aluminum-plastic composite belt longitudinal wrapping, which further effectively enhances the water-resistant performance of the whole cable. At the same time, the aluminum-plastic composite belt longitudinal wrapping further increases the strength of the cable, and makes the electric field in the cable radial, effectively prevents the electric field in the cable from being distorted, and ensures the transmission efficiency of the cable. Moreover, the aluminum-plastic composite belt longitudinal wrapping has the characteristics of low cost and mature processing technology, which can reduce the production cost, transportation cost and installation cost of the cable.

[0036] In the embodiment, the outer sheath 101 is a thermoplastic flame-retardant B1 type halogen-free low-smoke polyolefin sheath material, and the oxygen index is required to be greater than or equal to 32, which can meet the basic flame-retardant grade B1, and achieve halogen-free, low-smoke, non-toxic gas release and no combustion dripping.

[0037] In the embodiment, the first glass fiber cloth wrapping layer 102 and the second glass fiber cloth wrapping layer 105 are both halogen-free low-smoke high-flame-retardant glass fiber belts, which can meet the basic flame-retardant grade B1, achieve halogen-free, low-smoke, non-toxic gas release and no combustion dripping, and have high flame-retardant performance and longitudinal tensile force. In combination with the non-magnetic stainless steel belt chain armor, the toughness and pressure resistance of the protective outer cover can be further increased.

[0038] In the embodiment, the isolation sleeve 104 is a thermoplastic flame-retardant B1 type halogen-free low-smoke polyolefin sheath material, and the oxygen index is required to be greater than or equal to 40, which can meet the flame-retardant requirement in cooperation with the outer sheath 101 when the cable is on fire, and ensure the normal operation of the cable.

[0039] In the embodiment, the water-blocking tape around the protective layer 107 is specifically a semi-conductive buffer water-blocking tape, which, in combination with the metal water-blocking layer 106, further enhances the overall radial water-blocking performance of the cable, blocks the entry of water vapor, and avoids the water treeing aging of the cable insulation layer 204 caused by the entry of water vapor, thereby preventing insulation breakdown.

[0040] In the embodiment, the wire includes a conductor 206 and a shielding water-blocking layer wrapped around the conductor 206, which is a multi-layer structure including, from inside to outside, a conductor shielding layer 205, an insulation layer 204, an insulation shielding layer 203, a wire water-blocking tape wrapping layer 202, and a metal shielding layer 201. The multi-layer structure of the shielding water-blocking layer protects the conductor 206, thereby increasing the safety and reliability of the conductor 206.

[0041] In the embodiment, the wire water-blocking tape wrapping layer 202 is a semi-conductive buffer water-blocking tape. The semi-conductive water-blocking buffer tape can be used in combination with the steel tape shielding metal shielding layer 201 to further homogenize the electric field of the insulation core, avoid internal breakdown of the cable caused by partial discharge, and ensure the safety and stability of the insulation core.

[0042] The utility model discloses a kind of medium-voltage environmental protection flame-retardant water-blocking cables, outer sheath 101 in protective outer cover adopts thermoplastic type flame-retardant B1 type halogen-free low smoke polyolefin sheath material, for satisfying subway line laying environment, steel band layer 103 adopts non-magnetic stainless steel band interlocking armoring structure, increase the compression strength of cable itself, while enhanced the radial water-blocking performance of cable, metal water-blocking layer 106 adopts aluminium plastic composite tape, while enhancing water-blocking performance, increase the mechanical property of cable, and aluminium plastic composite tape longitudinal package makes cable internal electric field radial, effectively prevent cable internal electric field distortion, ensure the transmission efficiency of cable, water-blocking tape around the protective layer 107 and wire water-blocking tape wrapping layer 202 while enhancing the water-blocking performance of cable, synergistic effect with metal shielding layer 201, further homogenize the electric field of insulation core, avoid internal breakdown of the cable caused by partial discharge, ensure the safety and stability of insulation core.In addition, compared with ceramic silicon rubber, thermoplastic type flame-retardant B1 type halogen-free low smoke polyolefin sheath material can avoid that insulation core is expanded by heat in the resulfurization process of ceramic silicon rubber, too close combination is generated at insulation shielding and metal shielding, and obvious copper tape scratch is generated on the surface of insulation shielding after wire core cooling, reduce process cost, improve cable surface quality.

[0043] The above only describes preferred embodiments of the utility model and is not intended to limit the utility model. Those skilled in the art can make various changes and modifications to the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A medium voltage environmentally friendly flame and water retardant cable, characterized in that, The utility model relates to a kind of cable and protective outer sheath covered in wire;The protective outer sheath is multilayer structure, from inside to outside, it is water-blocking tape wrapping protective layer, metal water-blocking layer, second glass fiber cloth wrapping layer, spacer sleeve, steel band layer, first glass fiber cloth wrapping layer and outer sheath in sequence;Wherein, the steel band layer is chain armor, and double-layer steel band is formed by the arc hook of itself interlocking structure. The chain armor is non-magnetic stainless steel band chain armor.

2. A medium voltage environmentally friendly flame and water retardant cable as claimed in claim 1, characterized in that, The metal water-blocking layer is high-performance aluminum plastic composite tape longitudinal package.

3. A medium voltage environmentally friendly flame and water retardant cable as claimed in claim 1, characterized in that, The outer sheath is thermoplastic type flame-retardant B1 type halogen-free low-smoke polyolefin sheath material with oxygen index not less than 32.

4. A medium voltage environmentally friendly flame and water retardant cable as claimed in claim 1, characterized in that, The first glass fiber cloth wrapping layer and second glass fiber cloth wrapping layer are all halogen-free low-smoke high-flame-retardant glass fiber tape.

5. A medium voltage environmentally friendly flame and water retardant cable as claimed in claim 1, characterized in that, The spacer sleeve is thermoplastic type flame-retardant B1 type halogen-free low-smoke polyolefin sheath material with oxygen index not less than 40.

6. An environmentally friendly medium voltage flame and water retardant cable as claimed in claim 1, characterized in that, The water-blocking tape wrapping protective layer is semi-conductive buffer water-blocking tape.

7. A medium voltage environmentally friendly, flame and water retardant cable as claimed in claim 1, characterized in that, The wire includes conductor and shielding water-blocking layer wrapped in conductor.

8. An environmentally friendly medium voltage flame and water retardant cable as claimed in claim 1, characterized in that, The shielding water-blocking layer is multilayer structure, from inside to outside, it is conductor shielding layer, insulating layer, insulating shielding layer, wire water-blocking tape wrapping layer, metal shielding layer in sequence.

9. An environmentally friendly medium voltage flame and water retardant cable as claimed in claim 8, characterized in that, The wire water-blocking tape wrapping layer is specifically semi-conductive buffer water-blocking tape.

10. A medium voltage, environmentally friendly, flame and water retardant cable as claimed in claim 9, characterized in that, ​

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