Power cable temperature sensing insulating layer

Abstract

The invention provides a power cable temperature sensing insulating layer, and belongs to the technical field of power cables, and the power cable temperature sensing insulating layer comprises a protection compression-resistant sleeve; the shielding layer is fixedly arranged on the inner wall of the protective compression-resistant sleeve; the annular transition sleeve is fixedly arranged on the inner wall of the shielding layer; the compression resistance mechanism is arranged on the inner wall of the annular transition sleeve and is used for improving the overall compression resistance of the cable; the insulating layer is arranged on the compression-resistant mechanism; the number of the cable auxiliary cores is six, and the six cable auxiliary cores are fixedly arranged on the inner wall of the insulating layer in a circumferential array mode; and the cable main core is fixedly arranged among the six cable auxiliary cores. The problems that the physical and chemical properties of the power cable are not improved completely, and compared with an existing power cable, the tensile strength, the insulativity, the obdurability and the effective service life improvement effect are not obvious, the application and popularization performance is poor, and the comprehensive practicability is low are solved.

Description

Technical Field

[0001] The invention belongs to the field of power cables, and in particular relates to a temperature-sensitive insulation layer of a power cable. Background Art

[0002] The wire and cable industry is an important supporting industry for my country's economic construction and is widely used in various fields of the national economy. Wires and cables are indispensable basic equipment for transmitting electric energy, transmitting information and manufacturing various motors, electrical appliances, instruments, automobiles, machine tools and other equipment. With the rapid growth of China's economy and the further acceleration of industrialization and urbanization, my country's wire and cable industry has developed rapidly. In the subdivided industries of the machinery industry, the output value of the wire and cable manufacturing industry accounts for a quarter of the electrical and electrical industry. It is the second largest industry in the machinery industry after the automobile industry and occupies an important position in the national economy. In recent years, my country's economy has continued to develop rapidly, the urbanization process has been promoted, and the construction of major projects such as large-scale power stations, west-to-east power transmission, and power grid transformation have all indicated that the wire and cable industry has a long boom cycle, but the existing technology is not perfect in terms of the protection performance of power cables and the optimization of physical and chemical properties.

[0003] The prior art discloses a Chinese patent with application number CN201310609663.9, which discloses a flexible inorganic insulated fireproof power cable, including four cable cores, a thermal insulation lining, a metal sheath and an outer sheath layer, wherein each cable core includes a conductor, an insulating layer and a protective layer, the insulating layer is coated on the outside of the conductor, the protective layer is coated on the outside of the insulating layer, the thermal insulation lining is coated on the outside of the four cable cores, the metal sheath is coated on the outside of the thermal insulation lining, and the outer sheath layer is coated on the outside of the metal sheath.

[0004] The above patent has a simple structure, is fireproof, high temperature resistant, corrosion resistant and highly flexible, but the external protective sleeve provided in the above invention is the means used by most current cable protections, but the cable material will become hard after the protective sleeve is provided, affecting the laying of the finished cable. On the contrary, if a rigid protective sleeve is not used, the cable will often be stepped on or squeezed during construction or subsequent use, which may cause it to be stepped on or crushed at best, or even break the wire core inside, which will prevent the circuit from working properly. Summary of the invention

[0005] The purpose of the present invention is to provide a temperature-sensitive insulation layer for a power cable, aiming to solve the problems that the physical and chemical properties of power cables in the prior art are not improved perfectly, compared with the existing power cables, the tensile strength, insulation, toughness and effective service life are not significantly improved, the application promotion is poor and the comprehensive practicality is low.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A temperature-sensitive insulation layer for a power cable, comprising:

[0008] Protective compression sleeve;

[0009] A shielding layer, which is fixed to the inner wall of the protective pressure-resistant sleeve;

[0010] An annular transition sleeve, which is fixed to the inner wall of the shielding layer;

[0011] A compression resistance mechanism, which is arranged on the inner wall of the annular transition sleeve and is used to improve the overall compression resistance of the cable;

[0012] An insulating layer, which is provided on the pressure-resistant mechanism;

[0013] The cable auxiliary cores are provided with six of them, and the six cable auxiliary cores are fixedly arranged on the inner wall of the insulating layer in a circular array;

[0014] The main cable core is fixed between the six auxiliary cable cores.

[0015] As a preferred solution of the present invention, the pressure-resistant mechanism includes a small arc plate, a large arc plate, a first pressure-resistant buffer filler and a second pressure-resistant buffer filler. The small arc plates are provided in plurality, and the plurality of small arc plates are fixedly arranged on the inner wall of the annular transition sleeve in a circular array. The large arc plates are provided in plurality, and the plurality of large arc plates are fixedly arranged on the inner wall of the annular transition sleeve in a circular array and fit together with the plurality of small arc plates. The first pressure-resistant buffer fillers are provided in plurality, and the plurality of first pressure-resistant buffer fillers are respectively fixedly arranged on the inner walls of the plurality of small arc plates. The second pressure-resistant buffer fillers are provided in plurality, and the plurality of second pressure-resistant buffer fillers are respectively fixedly arranged on the inner walls of the plurality of large arc plates.

[0016] As a preferred solution of the present invention, the insulating layer is fixedly arranged on the surfaces of a plurality of the small arc plates and the large arc plates.

[0017] As a preferred solution of the present invention, the main cable core and the auxiliary cable core are both made of copper alloy or aluminum alloy; the insulating layer is made of fluorosilicone rubber doped with high-porosity modified ore filler; and the shielding layer is made of graphite fiber with metal plated surface.

[0018] As a preferred solution of the present invention, the annular transition sleeve adopts a HDPE / PET composite material containing modified silicone oil coated glass fiber, wherein the modified silicone oil is a silicone oil co-modified with epoxy and vinyl groups, and the amount of modified silicone oil coated glass fiber added accounts for 13-17wt% of the total mass of the HDPE / PET composite material, and the mass ratio of HDPE to PET in the composite material is 1:0.5-0.7.

[0019] As a preferred solution of the present invention, the first pressure-resistant buffer filler and the second pressure-resistant buffer filler are both a composition of ceramic micropowder and wood chips, the particle size of the ceramic micropowder is less than 3 μm, the particle size of the wood chips is less than 10 μm, and the mass ratio of the two is 1:0.5-1.

[0020] As a preferred solution of the present invention, the small arc plates and the large arc plates are alternately arranged, the surface end of the large arc plate is tangent to the insulating layer, and its two ends are fixedly connected to the inner wall of the annular transition sleeve, the arc surface end of the small arc plate is tangent to the insulating layer, and its two ends are fixedly connected to the outer arc surface of the large arc plate, and the arc support member also adopts a plastic alloy containing a compressive reinforcement skeleton.

[0021] As a preferred solution of the present invention, the plastic alloy containing a compressive reinforcement skeleton is made of fluorine-containing PE as a plastic alloy matrix and nano-oxide-doped carbon fiber / glass fiber composite fibers as a reinforcement skeleton, and the content of the reinforcement skeleton accounts for 6-9% of the mass of the alloy matrix.

[0022] As a preferred solution of the present invention, the nano oxide is a composition of nano titanium dioxide and nano silicon dioxide or nano magnesium dioxide, wherein the nano titanium dioxide content is not less than 60wt%, and the nano oxide doping amount is 8-10wt% of the mass of the carbon fiber / glass fiber composite fiber; in the composite fiber, the carbon fiber content accounts for 25-40wt%.

[0023] A temperature-sensitive insulation layer for a power cable, comprising the following steps:

[0024] S1. The main cable core and auxiliary cable core are made of copper alloy or aluminum alloy, and the alloy monofilaments are obtained by rough drawing and fine drawing in sequence, and then the alloy monofilaments are annealed. After completion, the alloy cable core is obtained by wire drawing and annealing, and the wire drawing operation is 2-4 monofilaments;

[0025] S2. Take the insulation material, extrude the insulation layer of the pre-alloyed cable core and vulcanize it, dry and degas the cable wire preparation;

[0026] S3. Take the first compressive buffer filler and the second compressive buffer filler material and roll and wrap the cable preparation body as the axis to obtain a cable intermediate;

[0027] S4. Take the shielding material and wrap it around the shielding layer, and finally cover it with the protective pressure-resistant sleeve.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. In this scheme, a small arc plate and a large arc plate are arranged between the cable insulation layer and the shielding layer. The arch plate is used as a force-bearing support frame to effectively improve the pressure-bearing capacity. The arch plate is divided into two large and small arcs, with good force dispersion and strong uniformity and stability. In addition, the inner cavity formed by the arch plate is filled with a first pressure-resistant buffer filler and a second pressure-resistant buffer filler, which provide good buffering, insulation and heat resistance. The ceramic micropowder has a small particle size and is dispersed and filled in the wood chips. It cooperates with the wood chips for easy electrostatic conduction, effectively improving the protection against current leakage of the inner cable core, and has good safety protection.

[0030] 2. In this scheme, as the main protective force-bearing part of the power cable, the small arc plate, the large arc plate and the protective pressure-resistant sleeve are all embedded with a compression-resistant reinforcement skeleton to further improve the compressive strength. The skeleton is based on plastic alloy and doped with reinforcing fillers. The synergistic effect has significantly improved hardness and flexibility. The plastic alloy matrix is ​​conducive to the fusion bonding between layers, and the cable has good peeling resistance between layers. Its network cross-linked winding structure not only has an excellent promoting effect on structural stability, but also has an excellent promoting effect on the connection and conduction of interlayer interfacial active groups or free ions, which greatly improves the stability of structural performance and significantly extends the performance cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0032] In the attached picture:

[0033] Figure 1 It is a first perspective stereogram of the present invention;

[0034] Figure 2 It is a first-view stereoscopic exploded view of the present invention;

[0035] Figure 3 It is a first perspective stereoscopic cross-sectional view of the present invention;

[0036] Figure 4 It is a first-view stereoscopic cross-sectional exploded view of the present invention;

[0037] Figure 5 It is a second viewing angle stereogram of the present invention;

[0038] Figure 6 This is a stereoscopic exploded view from a second viewing angle of the present invention.

[0039] Explanation of the numbers in the figure: 1. Main cable core; 2. Auxiliary cable core; 3. Insulation layer; 4. Small arc plate; 5. Large arc plate; 6. First pressure-resistant buffer filler; 7. Second pressure-resistant buffer filler; 8. Annular transition sleeve; 9. Shielding layer; 10. Protective pressure-resistant sleeve. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Example

[0042] See also Figure 1-6 , the technical solution provided by this embodiment is as follows:

[0043] A temperature-sensitive insulation layer of a power cable, which is composed of a protective pressure-resistant sleeve 10, a shielding layer 9, an annular transition sleeve 8, a pressure-resistant mechanism, an insulating layer 3, a cable auxiliary core 2 and a cable main core 1, is specifically described as follows:

[0044] See also Figure 1 , protective compression sleeve 10;

[0045] See also Figure 2 , the shielding layer 9 is fixedly arranged on the inner wall of the protective pressure-resistant sleeve 10;

[0046] See also Figure 3 , the annular transition sleeve 8 is fixedly arranged on the inner wall of the shielding layer 9;

[0047] See also Figure 6 , the pressure-resistant mechanism is arranged on the inner wall of the annular transition sleeve 8, which is used to improve the overall pressure resistance of the cable. Specifically, the pressure-resistant mechanism includes a small arc plate 4, a large arc plate 5, a first pressure-resistant buffer filler 6 and a second pressure-resistant buffer filler 7. There are several small arc plates 4, and several small arc plates 4 are fixedly arranged on the inner wall of the annular transition sleeve 8 in a circular array. There are several large arc plates 5, and several large arc plates 5 are fixedly arranged on the inner wall of the annular transition sleeve 8 in a circular array and fit with several small arc plates 4. There are several first pressure-resistant buffer fillers 6, and several first pressure-resistant buffer fillers 6 are respectively fixedly arranged on the inner walls of several small arc plates 4. There are several second pressure-resistant buffer fillers 7, and several second pressure-resistant buffer fillers 7 are respectively fixedly arranged on the inner walls of several large arc plates 5.

[0048] See also Figure 5 , the insulating layer 3 is arranged on the pressure-resistant mechanism;

[0049] See also Figure 4 There are six cable auxiliary cores 2, and the six cable auxiliary cores 2 are fixed on the inner wall of the insulating layer 3 in a circular array;

[0050] See also Figure 3The main cable core 1 is fixed between the six auxiliary cable cores 2.

[0051] See also Figure 5 The insulating layer 3 is fixed on the surface of a plurality of small arc plates 4 and a large arc plate 5.

[0052] See also Figure 1 The main cable core 1 and the auxiliary cable core 2 are both made of copper alloy or aluminum alloy; the insulating layer 3 is made of fluorosilicone rubber doped with high-porosity modified ore filler; and the shielding layer 9 is made of graphite fiber with metal plating on the surface.

[0053] See also Figure 3 The annular transition sleeve 8 adopts a HDPE / PET composite material containing modified silicone oil coated glass fiber, wherein the modified silicone oil is a silicone oil co-modified with epoxy and vinyl groups, and the amount of modified silicone oil coated glass fiber added accounts for 13-17wt% of the total mass of the HDPE / PET composite material, and the mass ratio of HDPE to PET in the composite material is 1:0.5-0.7.

[0054] See also Figure 6 The first pressure-resistant buffer filler 6 and the second pressure-resistant buffer filler 7 are both a combination of ceramic micropowder and wood chips, the particle size of the ceramic micropowder is less than 3 μm, the particle size of the wood chips is less than 10 μm, and the mass ratio of the two is 1:0.5-1.

[0055] See also Figure 6 The small arc plate 4 and the large arc plate 5 are arranged alternately, the surface end of the large arc plate 5 is tangent to the insulating layer 3, and its two ends are fixedly connected to the inner wall of the annular transition sleeve 8, the arc surface end of the small arc plate 4 is tangent to the insulating layer 3, and its two ends are fixedly connected to the outer arc surface of the large arc plate 5, and the arc support member also adopts a plastic alloy containing a compressive reinforced skeleton.

[0056] See also Figure 3 The plastic alloy containing a compressive reinforcement skeleton is made of fluorine-containing PE as a plastic alloy matrix and nano-oxide-doped carbon fiber / glass fiber composite fibers as a reinforcement skeleton, and the content of the reinforcement skeleton accounts for 6-9% of the mass of the alloy matrix.

[0057] See also Figure 5 The nano-oxide is a composition of nano-titanium dioxide and nano-silicon dioxide or nano-magnesium dioxide, wherein the content of nano-titanium dioxide is not less than 60wt%, and the doping amount of the nano-oxide is 8-10wt% of the mass of the carbon fiber / glass fiber composite fiber; in the composite fiber, the carbon fiber content accounts for 25-40wt%.

[0058] In a specific embodiment of the present invention: a small arc plate 4 and a large arc plate 5 are arranged between the cable insulation layer 3 and the shielding layer 9. The arch plate is used as a force-bearing support frame to effectively improve the pressure-bearing capacity, and the arch plate is divided into two large and small arcs, with good force dispersion and strong uniformity and stability. In addition, the inner cavity formed by the arch plate is filled with a first pressure-resistant buffer filler 6 and a second pressure-resistant buffer filler 7, which provide good buffering, insulation and heat resistance. The ceramic micropowder has a small particle size and is dispersed and filled in the wood chips, which cooperates with the wood chips for easy electrostatic conduction, effectively improving the protection against current leakage of the inner cable core, and has good safety protection.

[0059] As the main protective force-bearing part of the power cable, the small arc plate 4 and the large arc plate 5 and the protective pressure-resistant sleeve 10 are all embedded with a compression-resistant reinforcement skeleton to further improve the compressive strength. The skeleton is based on plastic alloy and doped with reinforcing fillers. The synergistic effect has significantly improved hardness and flexibility. The plastic alloy matrix is ​​conducive to the fusion bonding between layers, and the cable has good peeling resistance between layers. Its network cross-linked winding structure not only has an excellent promoting effect on structural stability, but also has an excellent promoting effect on the connection and conduction of interlayer interfacial active groups or free ions, which greatly improves the stability of structural performance and significantly extends the performance cycle.

[0060] A temperature-sensitive insulation layer for a power cable, comprising the following steps:

[0061] S1. The main cable core 1 and the auxiliary cable core 2 are made of copper alloy or aluminum alloy, and the alloy monofilaments are obtained by rough drawing and fine drawing in sequence, and then the alloy monofilaments are annealed, and then the alloy cable core is obtained by wire drawing and annealing, and the wire drawing operation is 2-4 monofilaments;

[0062] S2. Take the insulating layer 3 material, extrude the outer layer of the pre-alloyed cable core insulating layer 3 and vulcanize, dry and degas the cable wire preparation;

[0063] S3. Take the first pressure-resistant buffer filler 6 and the second pressure-resistant buffer filler 7 material and roll and coat the cable preparation body as the axis to obtain a cable intermediate;

[0064] S4. Take the material of the shielding layer 9 and wrap it around the shielding layer 9, and finally cover it with the protective pressure-resistant sleeve 10.

[0065] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A temperature-sensitive insulation layer for a power cable, characterized in that: include: Protective compression sleeve (10); A shielding layer (9) fixedly arranged on the inner wall of the protective pressure-resistant sleeve (10); An annular transition sleeve (8) fixedly arranged on the inner wall of the shielding layer (9); A compression resistance mechanism, which is arranged on the inner wall of the annular transition sleeve (8) and is used to improve the overall compression resistance of the cable; An insulating layer (3) disposed on the pressure-resistant structure; A cable auxiliary core (2), of which six are provided, and the six cable auxiliary cores (2) are fixedly arranged on the inner wall of the insulating layer (3) in a circumferential array; A cable main core (1) is fixedly arranged between the six cable auxiliary cores (2).

2. A temperature-sensitive insulation layer for a power cable according to claim 1, characterized in that: The pressure-resistant mechanism comprises a small arc plate (4), a large arc plate (5), a first pressure-resistant buffer filler (6) and a second pressure-resistant buffer filler (7). The small arc plates (4) are provided in plurality, and the plurality of small arc plates (4) are fixedly arranged on the inner wall of the annular transition sleeve (8) in a circumferential array. The large arc plates (5) are provided in plurality, and the plurality of large arc plates (5) are fixedly arranged on the inner wall of the annular transition sleeve (8) in a circumferential array and fit together with the plurality of small arc plates (4). The first pressure-resistant buffer filler (6) is provided in plurality, and the plurality of the first pressure-resistant buffer fillers (6) are respectively fixedly arranged on the inner walls of the plurality of small arc plates (4). The second pressure-resistant buffer filler (7) is provided in plurality, and the plurality of the second pressure-resistant buffer fillers (7) are respectively fixedly arranged on the inner walls of the plurality of large arc plates (5).

3. A temperature-sensitive insulation layer for power cables according to claim 2, characterized in that: The insulating layer (3) is fixedly arranged on the surfaces of the plurality of small arc-shaped plates (4) and the large arc-shaped plates (5).

4. A temperature-sensitive insulation layer for a power cable according to claim 3, characterized in that: The cable main core (1) and the cable auxiliary core (2) are both made of copper alloy or aluminum alloy; the insulating layer (3) is made of fluorosilicone rubber doped with high-porosity modified ore filler; and the shielding layer (9) is made of graphite fiber with a metal-plated surface.

5. A temperature-sensitive insulation layer for a power cable according to claim 4, characterized in that: The annular transition sleeve (8) is made of a HDPE / PET composite material containing modified silicone oil coated glass fiber, wherein the modified silicone oil is silicone oil co-modified with epoxy and vinyl groups, the amount of modified silicone oil coated glass fiber added accounts for 13-17wt% of the total mass of the HDPE / PET composite material, and the mass ratio of HDPE to PET in the composite material is 1:0.5-0.

7.

6. A temperature-sensitive insulation layer for a power cable according to claim 5, characterized in that: The first pressure-resistant buffer filler (6) and the second pressure-resistant buffer filler (7) are both a composition of ceramic micropowder and wood chips, the particle size of the ceramic micropowder is less than 3 μm, the particle size of the wood chips is less than 10 μm, and the mass ratio of the two is 1:0.5-1.

7. A temperature-sensitive insulation layer for a power cable according to claim 6, characterized in that: The small arc plates (4) and the large arc plates (5) are arranged alternately and spaced apart. The surface end of the large arc plate (5) is tangent to the insulating layer (3), and its two ends are fixedly connected to the inner wall of the annular transition sleeve (8). The arc surface end of the small arc plate (4) is tangent to the insulating layer (3), and its two ends are fixedly connected to the outer arc surface of the large arc plate (5). The arc support member also adopts a plastic alloy containing a compression-resistant reinforced skeleton.

8. A temperature-sensitive insulation layer for a power cable according to claim 7, characterized in that: The plastic alloy containing a compression-resistant reinforcement skeleton is made of fluorine-containing PE as a plastic alloy matrix and nano-oxide-doped carbon fiber / glass fiber composite fibers as a reinforcement skeleton, and the content of the reinforcement skeleton accounts for 6-9% of the mass of the alloy matrix.

9. A temperature-sensitive insulation layer for a power cable according to claim 8, characterized in that: The nano oxide is a combination of nano titanium dioxide and nano silicon dioxide or nano magnesium dioxide, wherein the content of nano titanium dioxide is not less than 60wt%, and the doping amount of nano oxide is 8-10wt% of the mass of carbon fiber / glass fiber composite fiber; in the composite fiber, the content of carbon fiber accounts for 25-40wt%.

10. A temperature-sensitive insulation layer of a power cable, characterized in that: It includes the following steps: S1. The main cable core (1) and the auxiliary cable core (2) are made of copper alloy or aluminum alloy, and the alloy monofilaments are obtained by rough drawing and fine drawing in sequence, and then the alloy monofilaments are annealed, and after completion, the alloy cable core is obtained by wire drawing and annealing, and the wire drawing operation is 2-4 monofilaments; S2. Take the insulating layer (3) material, extrude the outer layer of the pre-alloyed cable core insulating layer (3) and vulcanize, dry and degas the cable wire preparation; S3. Take the first pressure-resistant buffer filler (6) and the second pressure-resistant buffer filler (7) material and roll and wrap the cable preparation body as the axis to obtain a cable intermediate; S4. Take the shielding layer (9) material and wrap it around the shielding layer (9), and finally cover it with the protective pressure-resistant sleeve (10).

Images