Cable capable of being identified after being wetted

Abstract

The utility model relates to the technical field of cable manufacturing, in particular to a large-section direct-current high-voltage cable capable of being identified after being wetted with water. The utility model discloses a cable capable of being identified after being wetted, which comprises an insulating wire core, a conductor wire core formed by twisting single wires is arranged in the middle of the insulating wire core, the conductor wire core comprises a central line, and a plurality of round wire layers are twisted outside the central line; color-developing water-blocking yarns are twisted in gaps between the center line and the round wire layers and between the adjacent round wire layers; a color-developing water-blocking buffer strip is wrapped outside the insulating wire core, and a color-developing coating is arranged on the color-developing water-blocking buffer strip. The technical problem solved by the utility model is to devote to develop the cable capable of being identified after being wetted, which can quickly and accurately judge the water inflow condition after the cable is wetted.

Description

Technical Field

[0001] The utility model relates to the technical field of cable manufacturing, in particular to a large-section DC high-voltage cable which can be marked after being wetted with water. Background Art

[0002] With the continuous rapid development of my country's national economy and the continuous improvement of people's living standards, the demand for electricity in various industries is increasing. In the fields of electricity, communications, etc., the safety and stability of cables are crucial to the operation of the system. However, today's cables are mostly used outdoors. When the cables are flooded or soaked in water for a long time, the insulation performance inside the cables will also be affected. In severe cases, it may cause cable failure or safety accidents. However, the inside of traditional cables cannot be marked, and it is impossible to accurately judge the water ingress status inside the cables, let alone the location and degree of water ingress inside the cables.

[0003] Therefore, those skilled in the art are committed to developing a water-markable cable that can quickly and accurately determine the water ingress status of the cable. Utility Model Content

[0004] In view of the above-mentioned defects of the prior art, the utility model discloses a cable that can be marked after being wetted with water. The technical problem to be solved is to provide a cable that can be marked after being wetted with water, which can quickly and accurately judge the water ingress status of the cable.

[0005] To achieve the above-mentioned purpose, the utility model provides a cable that can be marked after being wetted with water, including an insulating core, the middle part of the insulating core is a conductor core formed by twisting single wires, the conductor core includes a center line, and several layers of round wire layers are twisted outside the center line; color-developing water-blocking yarns are twisted in the gaps between the center line and the round wire layers and between adjacent round wire layers; a color-developing water-blocking buffer tape is wrapped around the outside of the insulating core, and a color-developing water-blocking buffer tape is provided with a color-developing coating.

[0006] The principle is as follows: both the color-developing water-blocking yarn and the color-developing water-blocking buffer tape can change color after being wetted with water. The water-blocking yarn can be mixed with water-discoloring substances during manufacturing, and the color-developing water-blocking buffer tape is coated with water-discoloring substances. Specifically, the water-discoloring substance can be made of the material of water-discoloring paper, which is white in a dry state and turns red when exposed to water. For details, please refer to the material of Chuangbaoda test paper; or anhydrous cobalt chloride (CoCl), which is dark blue when not exposed to water and turns pink to red after absorbing water. Through the color changes of the conductor core and the color-developing water-blocking buffer tape, it can be judged whether the conductor core or the outer surface of the insulation layer has water ingress, as well as the location and degree of water ingress, so that the cable status can be quickly and accurately judged after the cable has been flooded.

[0007] Preferably, the color-developing water-blocking yarn is formed by spirally twisting a plurality of yarns, wherein at least one of the yarns is made of a material that changes color when in contact with water, so that the color can be displayed after contacting water. The use of spiral twisting can increase the strength of the water-blocking yarn.

[0008] Preferably, water-blocking powder is filled between some of the yarns, and the water-blocking powder can swell when it comes into contact with water, thereby achieving the effect of water-blocking and moisture-proofing.

[0009] Preferably, the color-developing water-blocking buffer tape is a semi-conductive water-blocking tape, and the middle portion of the water-blocking tape is coated with a strip-shaped color-developing coating that changes color when exposed to water.

[0010] Preferably, the distance between the edge of the color-developing coating and the edge of the water-blocking tape is at least 3 mm, thereby ensuring that the color change after contact with water is easy to observe. Since the coating of the strip coating only occupies the middle position and the coating is very thin, it will not affect the water-blocking performance and semi-conductive performance of the water-blocking buffer tape.

[0011] Preferably, the wrapping rate of the color-developing water-blocking buffer tape is not less than 40%. When a water ingress accident occurs to the cable, the water ingress distance can also be determined by judging the color of the color-developing water-blocking buffer tape.

[0012] Preferably, the color developing water blocking buffer belt has a width of at least 10 mm and a thickness of at least 1 mm, which can be specifically designed according to the specifications of the cable.

[0013] Preferably, the conductor core is provided with a conductor shielding layer, an insulating layer and an insulating shielding layer in order from the inside to the outside; the color-developing water-blocking buffer belt is provided with a metal sheath and an outer sheath. The conductor core is the core part of the cable, used to transmit current or signals; the insulating layer is wrapped on the outside of the conductor shielding layer of the core, used to isolate the conductor from the external environment; the color-developing water-blocking buffer belt is arranged on the outer surface of the insulating shielding layer, used to detect the water ingress of the cable; the metal sheath is located outside the color-developing water-blocking buffer belt, used to protect the internal structure of the cable and enhance the mechanical strength of the cable; the outer sheath is located on the outermost layer, used to further protect the cable from the influence of the external environment.

[0014] The specific preparation process is: place the prepared color-developing water-blocking yarn on the edge of the round wire of the conductor core, and twist it into the gap of the conductor core together with the twisting of the round wire. If a water ingress accident occurs in the cable, the water ingress length can be analyzed by dissecting the conductor core, providing a basis for subsequent line restoration and loss judgment. The prepared conductor core is then extruded through a plastic extrusion device to extrude a conductor shielding layer, an insulating layer, and an insulating shielding layer of uniform thickness to complete the production of the insulating core. The color-developing water-blocking buffer tape is then evenly wrapped around the outer surface of the insulating core through a wrapping device to ensure that the color-developing water-blocking buffer tape fits tightly to the surface of the insulating core without gaps. At the same time, in order to ensure the stability and reliability of the water-immersion identification tape, the cable can also be subjected to certain heat treatments and aging tests.

[0015] The beneficial effects of the utility model are:

[0016] By twisting a color-developing water-blocking yarn inside the conductor core of the insulating core and wrapping a color-developing water-blocking buffer tape around the insulating core, the water ingress status of the cable can be accurately determined by detecting the color changes of the color-developing water-blocking yarn and the color-developing water-blocking buffer tape, that is, accurately determining whether the cable has been flooded, and further determining the water ingress position, degree, depth, and length of the cable based on the color changes of the wrapping tape. At the same time, the water-discoloring substance will rapidly change color when it comes into contact with water, without the need for complex detection equipment and operation procedures, which is convenient and quick; and the manufacturing cost of the color-developing water-blocking yarn and the color-developing water-blocking buffer tape is low, and is easy to combine with the cable manufacturing process, thereby reducing the cable manufacturing cost. The wet water marking cable structure of the utility model is suitable for cables of various types and specifications, including power cables, communication cables, etc., and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of a specific implementation method of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the conductor core of the utility model;

[0019] Figure 3 It is a schematic diagram of the colored water-blocking buffer tape of the utility model wrapped around the insulating wire core;

[0020] Figure 4 It is a schematic diagram of the expansion of the color-developing water-blocking buffer belt of the utility model.

[0021] In the above drawings: 1. Insulated wire core; 11. Conductor wire core; 111. Center wire; 112. Round wire layer; 113. Colored water-blocking yarn; 12. Conductor shielding layer; 13. Insulating layer; 14. Insulating shielding layer; 2. Colored water-blocking buffer tape; 21. Colored coating; 3. Metal sheath; 4. Outer sheath. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific manner, and therefore cannot be understood as a limitation on the present invention. The terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] like Figure 1 and Figure 2 As shown, the utility model provides a cable that can be marked after being wetted with water, including an insulating core 1, the middle part of the insulating core 1 is a conductor core 11 formed by twisting a single wire, and the conductor core 11 is provided with a conductor shielding layer 12, an insulating layer 13 and an insulating shielding layer 14 in sequence from the inside to the outside. A color-developing water-blocking buffer tape 2 is arranged on the outer surface of the insulating shielding layer 14, and is used to detect the water ingress condition of the cable, and a metal sheath 3 and an outer sheath 4 are arranged outside the color-developing water-blocking buffer tape 2. Among them, the conductor core 11 is the core part of the cable, and is used to transmit current or signals; the insulating layer 13 is wrapped around the outside of the conductor shielding layer 12 of the conductor core, and is used to isolate the conductor from the external environment; the metal sheath 3 is located outside the color-developing water-blocking buffer tape 2, and is used to protect the internal structure of the cable and enhance the mechanical strength of the cable; the outer sheath 4 is located in the outermost layer, and is used to further protect the cable from the influence of the external environment.

[0024] like Figure 2 As shown, the conductor core 11 includes a center line 111, and several layers of round wire layers 112 are twisted outside the center line 111; color-developing water-blocking yarn 113 is twisted between the center line 111 and the round wire layer 112 and in the gaps between adjacent round wire layers 112. A color-developing water-blocking buffer tape 2 is wrapped around the outside of the insulating core 1, and a color-developing coating 21 is provided on the color-developing water-blocking buffer tape 2. The color-developing water-blocking yarn 113 is formed by spirally twisting several yarns, and water-blocking powder is filled between several yarns. The water-blocking powder can swell when it comes into contact with water, and has the effect of blocking water and preventing moisture. At least one of the yarns is made of a material that changes color when it comes into contact with water, so that it can be displayed after coming into contact with water. The use of spiral twisting can increase the strength of the water-blocking yarn.

[0025] like Figure 3 and Figure 4As shown, the color-developing water-blocking buffer tape 2 is a semi-conductive water-blocking tape, and the middle part of the water-blocking tape is coated with a strip-shaped color-developing coating 21 that changes color when exposed to water. The width of the color-developing water-blocking buffer tape 2 is at least 10 mm, and the thickness is at least 1 mm. It can be specifically designed according to the specifications of the cable. The distance between the edge of the color-developing coating 21 and the edge of the water-blocking tape is at least 3 mm, thereby ensuring that it is easy to observe after the color changes when exposed to water. Since the paint of the strip-shaped color-developing coating only occupies the middle position, and the coating is very thin, it will not affect the water-blocking performance and semi-conductive performance of the water-blocking buffer tape, and the wrapping rate of the color-developing water-blocking buffer tape 2 is not less than 40%. When a water inflow accident occurs in the cable, the water inflow distance can also be judged by judging the color of the color-developing water-blocking buffer tape 2.

[0026] The principle of the wet water mark of the utility model is that the color-developing water-blocking yarn 113 and the color-developing water-blocking buffer tape 2 can both change color after being wetted with water. The water-blocking yarn can be mixed with a water-discoloring substance during manufacturing, and the color-developing water-blocking buffer tape 2 is coated with a water-discoloring substance. Specifically, the water-discoloring substance can be made of a material that turns red when exposed to water. It is white in a dry state and turns red when exposed to water. For details, please refer to the material of the Chuangbaoda test paper; or anhydrous cobalt chloride (CoCl), which appears dark blue when not exposed to water, and turns pink to red after absorbing water. Through the color changes of the conductor core 11 and the color-developing water-blocking buffer tape 2, it can be judged whether the conductor core 11 or the outer surface of the insulating layer 13 is flooded, as well as the location and degree of water ingress, so that the state of the cable can be quickly and accurately judged after the cable is flooded.

[0027] In the above embodiments, by twisting the color-developing water-blocking yarn 113 inside the conductor core 11 of the insulating core 1, and wrapping the color-developing water-blocking buffer tape 2 around the insulating core 1, by detecting the color changes of the color-developing water-blocking yarn 113 and the color-developing water-blocking buffer tape 2, the water ingress condition of the cable can be accurately determined, that is, whether the cable has been flooded, and based on the color changes of the wrapping tape, the water ingress position, degree, depth and length of the cable can be further determined. At the same time, the water-discoloring substance will change color rapidly when it comes into contact with water, without the need for complex detection equipment and operation procedures, which is convenient and quick; and the manufacturing cost of the color-developing water-blocking yarn and the color-developing water-blocking buffer tape is low, and it is easy to combine with the cable manufacturing process, thereby reducing the cable manufacturing cost. The wet water marking cable structure of the utility model is suitable for cables of various types and specifications, including power cables, communication cables, etc., and has a wide range of applications.

[0028] Specifically, the preparation process of the cable of the utility model is as follows: the prepared color-developing water-blocking yarn 113 is placed on the edge of the round wire single wire of the conductor core 11, and is twisted into the gap of the conductor core 11 together with the twisting of the round wire single wire. If a water ingress accident occurs in the cable, the water ingress length can be analyzed by dissecting the conductor core 11, providing a basis for subsequent line restoration and loss judgment. The prepared conductor core 11 is then extruded through a plastic extrusion device to extrude a conductor shielding layer 12, an insulating layer 13 and an insulating shielding layer 14 of uniform thickness to complete the production of the insulating core 1, and then the color-developing water-blocking buffer tape 2 is evenly wrapped around the outer surface of the insulating core 1 through a wrapping device to ensure that the color-developing water-blocking buffer tape 2 fits tightly to the surface of the insulating core 1 without gaps. At the same time, in order to ensure the stability and reliability of the water-immersion identification tape, the cable can also be subjected to certain heat treatments and aging tests.

[0029] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A cable that can be marked after being wetted with water, characterized in that: The invention comprises an insulating wire core (1), wherein the middle part of the insulating wire core (1) is a conductor wire core (11) formed by twisting single wires, wherein the conductor wire core (11) comprises a center wire (111), and a plurality of round wire layers (112) are twisted outside the center wire (111); color-developing water-blocking yarns (113) are twisted in the gaps between the center wire (111) and the round wire layers (112) and between adjacent round wire layers (112); and a color-developing water-blocking buffer tape (2) is wrapped around the insulating wire core (1), and a color-developing water-blocking buffer tape (2) is provided with a color-developing coating (21).

2. The cable that can be marked after being wetted with water according to claim 1, characterized in that: The color-developing water-blocking yarn (113) is formed by a plurality of yarns twisted in a spiral, wherein at least one of the yarns is made of a material that changes color when in contact with water.

3. The cable that can be marked after being wetted with water as claimed in claim 2, characterized in that: Water-blocking powder is filled between a plurality of the yarns.

4. The cable that can be marked after being wetted with water according to claim 1, characterized in that: The color-developing water-blocking buffer tape (2) is a semi-conductive water-blocking tape material, and the middle portion of the water-blocking tape material is coated with a strip-shaped color-developing coating (21) that changes color when exposed to water.

5. The cable that can be marked after being wetted with water as claimed in claim 4, characterized in that: The distance between the edge of the color-developing coating (21) and the edge of the water-blocking tape is at least 3 mm.

6. The cable that can be marked after being wetted with water according to claim 1, characterized in that: The wrapping rate of the color-developing water-blocking buffer tape (2) is not less than 40%.

7. The cable that can be marked after being wetted with water according to claim 1, characterized in that: The width of the color-developing water-blocking buffer zone (2) is at least 10 mm.

8. The cable that can be marked after being wetted with water according to claim 1, characterized in that: The conductor core (11) is provided with a conductor shielding layer (12), an insulating layer (13) and an insulating shielding layer (14) in sequence from the inside to the outside; the color-developing water-blocking buffer belt (2) is provided with a metal sheath (3) and an outer sheath (4).

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